From e106da3af71001ff74163d7bb08b9b3195c459a4 Mon Sep 17 00:00:00 2001
From: Matthew Miller <mmiller@duosecurity.com>
Date: Wed, 29 Jun 2022 19:22:04 +0000
Subject: [PATCH] Merge pull request #1703 from
 w3c/masterkale-1683-json-serialization

SHA: 3cdea2be98b6758307c5d275b22a307881efbc93
Reason: push, by @MasterKale

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 2119 ++++++++++++++++++++++++++++++++--------------------
 1 file changed, 1303 insertions(+), 816 deletions(-)

diff --git a/index.html b/index.html
index e7dc13118..e587416cf 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,7 @@
   <meta content="ED" name="w3c-status">
   <meta content="Bikeshed version 37b7e7e68, updated Fri May 27 15:08:11 2022 -0700" name="generator">
   <link href="https://www.w3.org/TR/webauthn-3/" rel="canonical">
-  <meta content="96223883ed9d1e3c1c53888e7e8810315091cda1" name="document-revision">
+  <meta content="3cdea2be98b6758307c5d275b22a307881efbc93" name="document-revision">
 <style type="text/css">
 body {
     counter-reset: table;
@@ -381,7 +381,7 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
    <h1>Web Authentication:<br>An API for accessing Public Key Credentials<br>Level 3</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2022-06-09">9 June 2022</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2022-06-29">29 June 2022</time></p>
    <details open>
     <summary>More details about this document</summary>
     <div data-fill-with="spec-metadata">
@@ -526,6 +526,8 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
         <li><a href="#sctn-storeCredential"><span class="secno">5.1.5</span> <span class="content">Store an Existing Credential - PublicKeyCredential’s <code>[[Store]](credential, sameOriginWithAncestors)</code> Method</span></a>
         <li><a href="#sctn-preventSilentAccessCredential"><span class="secno">5.1.6</span> <span class="content">Preventing Silent Access to an Existing Credential - PublicKeyCredential’s <code>[[preventSilentAccess]](credential, sameOriginWithAncestors)</code> Method</span></a>
         <li><a href="#sctn-isUserVerifyingPlatformAuthenticatorAvailable"><span class="secno">5.1.7</span> <span class="content">Availability of <span>User-Verifying Platform Authenticator</span> - PublicKeyCredential’s <code>isUserVerifyingPlatformAuthenticatorAvailable()</code> Method</span></a>
+        <li><a href="#sctn-parseCreationOptionsFromJSON"><span class="secno">5.1.8</span> <span class="content">Deserialize Registration ceremony options - PublicKeyCredential’s <code>parseCreationOptionsFromJSON()</code> Method</span></a>
+        <li><a href="#sctn-parseRequestOptionsFromJSON"><span class="secno">5.1.9</span> <span class="content">Deserialize Authentication ceremony options - PublicKeyCredential’s <code>parseRequestOptionsFromJSON()</code> Methods</span></a>
        </ol>
       <li>
        <a href="#iface-authenticatorresponse"><span class="secno">5.2</span> <span class="content">Authenticator Responses (interface <span><code>AuthenticatorResponse</code></span>)</span></a>
@@ -1769,11 +1771,11 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
      <div class="support">
       <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
       <hr>
-      <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+      <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
       <hr>
       <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
       <hr>
-      <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>49+</span></span>
+      <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android no"><span>Opera Mobile</span><span>?</span></span>
      </div>
     </div>
    </div>
@@ -1785,6 +1787,7 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
     [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject①"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#authenticatorresponse" id="ref-for-authenticatorresponse"><c- n>AuthenticatorResponse</c-></a>    <a class="idl-code" data-link-type="attribute" data-readonly data-type="AuthenticatorResponse" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response①"><c- g>response</c-></a>;
     [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject②"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①"><c- b>DOMString</c-></a>?               <a class="idl-code" data-link-type="attribute" data-readonly data-type="DOMString?" href="#dom-publickeycredential-authenticatorattachment" id="ref-for-dom-publickeycredential-authenticatorattachment"><c- g>authenticatorAttachment</c-></a>;
     <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientoutputs" id="ref-for-dictdef-authenticationextensionsclientoutputs"><c- n>AuthenticationExtensionsClientOutputs</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="getClientExtensionResults()" id="dom-publickeycredential-getclientextensionresults"><code><c- g>getClientExtensionResults</c-></code></dfn>();
+    <a data-link-type="idl-name" href="#typedefdef-publickeycredentialjson" id="ref-for-typedefdef-publickeycredentialjson"><c- n>PublicKeyCredentialJSON</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="toJSON()" id="dom-publickeycredential-tojson"><code><c- g>toJSON</c-></code></dfn>();
 };
 </pre>
    <dl>
@@ -1801,11 +1804,11 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
        <div class="support">
         <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
         <hr>
-        <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+        <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
         <hr>
         <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
         <hr>
-        <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>49+</span></span>
+        <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android no"><span>Opera Mobile</span><span>?</span></span>
        </div>
       </div>
      </div>
@@ -1821,11 +1824,11 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
        <div class="support">
         <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
         <hr>
-        <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+        <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
         <hr>
         <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
         <hr>
-        <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>49+</span></span>
+        <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android no"><span>Opera Mobile</span><span>?</span></span>
        </div>
       </div>
      </div>
@@ -1855,25 +1858,75 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
        <div class="support">
         <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
         <hr>
-        <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+        <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
         <hr>
         <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
         <hr>
-        <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>49+</span></span>
+        <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android no"><span>Opera Mobile</span><span>?</span></span>
        </div>
       </div>
      </div>
      <p><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults">getClientExtensionResults()</a></code></p>
     <dd data-md>
      <p>This operation returns the value of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-clientextensionsresults-slot" id="ref-for-dom-publickeycredential-clientextensionsresults-slot">[[clientExtensionsResults]]</a></code>, which is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map">map</a> containing <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier">extension identifier</a> → <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output">client extension output</a> entries produced by the extension’s <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing">client extension processing</a>.</p>
+    <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-tojson" id="ref-for-dom-publickeycredential-tojson">toJSON()</a></code>
+    <dd data-md>
+     <p>This operation returns <code class="idl"><a data-link-type="idl" href="#dictdef-registrationresponsejson" id="ref-for-dictdef-registrationresponsejson">RegistrationResponseJSON</a></code> or <code class="idl"><a data-link-type="idl" href="#dictdef-authenticationresponsejson" id="ref-for-dictdef-authenticationresponsejson">AuthenticationResponseJSON</a></code>,
+which are <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types">JSON type</a> representations mirroring <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential⑥">PublicKeyCredential</a></code>, suitable for submission to a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧①">Relying Party</a> server as an <code>application/json</code> payload. The <a data-link-type="dfn" href="#client" id="ref-for-client①⑤">client</a> is in charge of <a href="https://webidl.spec.whatwg.org/#idl-tojson-operation">serializing values to JSON types as usual</a>,
+but MUST take additional steps to first encode any <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②">ArrayBuffer</a></code> values to <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③">DOMString</a></code> values
+using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①">base64url encoding</a>.</p>
+     <p>The <code class="idl"><a data-link-type="idl" href="#dom-registrationresponsejson-clientextensionresults" id="ref-for-dom-registrationresponsejson-clientextensionresults">RegistrationResponseJSON.clientExtensionResults</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-authenticationresponsejson-clientextensionresults" id="ref-for-dom-authenticationresponsejson-clientextensionresults">AuthenticationResponseJSON.clientExtensionResults</a></code> member MUST be set to the output of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults①">getClientExtensionResults()</a></code>,
+with any <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer③">ArrayBuffer</a></code> values encoded to <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④">DOMString</a></code> values using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding②">base64url encoding</a>. This MAY include <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer④">ArrayBuffer</a></code> values from extensions registered
+in the IANA "WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries">[IANA-WebAuthn-Registries]</a> but not
+defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.</p>
+     <p>The <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponsejson-transports" id="ref-for-dom-authenticatorattestationresponsejson-transports">AuthenticatorAttestationResponseJSON.transports</a></code> member MUST be set to the output of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports">getTransports()</a></code>.</p>
+   </dl>
+<pre class="idl highlight def"><c- b>typedef</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤"><c- b>DOMString</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-base64urlstring"><code><c- g>Base64URLString</c-></code></dfn>;
+<c- b>typedef</c-> (<a data-link-type="idl-name" href="#dictdef-registrationresponsejson" id="ref-for-dictdef-registrationresponsejson①"><c- n>RegistrationResponseJSON</c-></a> <c- b>or</c-> <a data-link-type="idl-name" href="#dictdef-authenticationresponsejson" id="ref-for-dictdef-authenticationresponsejson①"><c- n>AuthenticationResponseJSON</c-></a>) <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-publickeycredentialjson"><code><c- g>PublicKeyCredentialJSON</c-></code></dfn>;
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-registrationresponsejson"><code><c- g>RegistrationResponseJSON</c-></code></dfn> {
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="RegistrationResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-registrationresponsejson-id"><code><c- g>id</c-></code><a class="self-link" href="#dom-registrationresponsejson-id"></a></dfn>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring①"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="RegistrationResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-registrationresponsejson-rawid"><code><c- g>rawId</c-></code><a class="self-link" href="#dom-registrationresponsejson-rawid"></a></dfn>;
+    <a data-link-type="idl-name" href="#dictdef-authenticatorattestationresponsejson" id="ref-for-dictdef-authenticatorattestationresponsejson"><c- n>AuthenticatorAttestationResponseJSON</c-></a> <dfn class="idl-code" data-dfn-for="RegistrationResponseJSON" data-dfn-type="dict-member" data-export data-type="AuthenticatorAttestationResponseJSON " id="dom-registrationresponsejson-response"><code><c- g>response</c-></code><a class="self-link" href="#dom-registrationresponsejson-response"></a></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑥"><c- b>DOMString</c-></a>?  <dfn class="idl-code" data-dfn-for="RegistrationResponseJSON" data-dfn-type="dict-member" data-export data-type="DOMString?  " id="dom-registrationresponsejson-authenticatorattachment"><code><c- g>authenticatorAttachment</c-></code><a class="self-link" href="#dom-registrationresponsejson-authenticatorattachment"></a></dfn>;
+    <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientoutputsjson" id="ref-for-dictdef-authenticationextensionsclientoutputsjson"><c- n>AuthenticationExtensionsClientOutputsJSON</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="RegistrationResponseJSON" data-dfn-type="dict-member" data-export data-type="AuthenticationExtensionsClientOutputsJSON " id="dom-registrationresponsejson-clientextensionresults"><code><c- g>clientExtensionResults</c-></code></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑦"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="RegistrationResponseJSON" data-dfn-type="dict-member" data-export data-type="DOMString " id="dom-registrationresponsejson-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-registrationresponsejson-type"></a></dfn>;
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticatorattestationresponsejson"><code><c- g>AuthenticatorAttestationResponseJSON</c-></code></dfn> {
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring②"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticatorAttestationResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-authenticatorattestationresponsejson-clientdatajson"><code><c- g>clientDataJSON</c-></code><a class="self-link" href="#dom-authenticatorattestationresponsejson-clientdatajson"></a></dfn>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring③"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticatorAttestationResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-authenticatorattestationresponsejson-attestationobject"><code><c- g>attestationObject</c-></code><a class="self-link" href="#dom-authenticatorattestationresponsejson-attestationobject"></a></dfn>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑧"><c- b>DOMString</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponseJSON" data-dfn-type="dict-member" data-export data-type="sequence<DOMString> " id="dom-authenticatorattestationresponsejson-transports"><code><c- g>transports</c-></code></dfn>;
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationresponsejson"><code><c- g>AuthenticationResponseJSON</c-></code></dfn> {
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring④"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-authenticationresponsejson-id"><code><c- g>id</c-></code><a class="self-link" href="#dom-authenticationresponsejson-id"></a></dfn>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring⑤"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-authenticationresponsejson-rawid"><code><c- g>rawId</c-></code><a class="self-link" href="#dom-authenticationresponsejson-rawid"></a></dfn>;
+    <a data-link-type="idl-name" href="#dictdef-authenticatorassertionresponsejson" id="ref-for-dictdef-authenticatorassertionresponsejson"><c- n>AuthenticatorAssertionResponseJSON</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationResponseJSON" data-dfn-type="dict-member" data-export data-type="AuthenticatorAssertionResponseJSON " id="dom-authenticationresponsejson-response"><code><c- g>response</c-></code><a class="self-link" href="#dom-authenticationresponsejson-response"></a></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑨"><c- b>DOMString</c-></a>?  <dfn class="idl-code" data-dfn-for="AuthenticationResponseJSON" data-dfn-type="dict-member" data-export data-type="DOMString?  " id="dom-authenticationresponsejson-authenticatorattachment"><code><c- g>authenticatorAttachment</c-></code><a class="self-link" href="#dom-authenticationresponsejson-authenticatorattachment"></a></dfn>;
+    <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientoutputsjson" id="ref-for-dictdef-authenticationextensionsclientoutputsjson①"><c- n>AuthenticationExtensionsClientOutputsJSON</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationResponseJSON" data-dfn-type="dict-member" data-export data-type="AuthenticationExtensionsClientOutputsJSON " id="dom-authenticationresponsejson-clientextensionresults"><code><c- g>clientExtensionResults</c-></code></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⓪"><c- b>DOMString</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationResponseJSON" data-dfn-type="dict-member" data-export data-type="DOMString " id="dom-authenticationresponsejson-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-authenticationresponsejson-type"></a></dfn>;
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticatorassertionresponsejson"><code><c- g>AuthenticatorAssertionResponseJSON</c-></code></dfn> {
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring⑥"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticatorAssertionResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-authenticatorassertionresponsejson-clientdatajson"><code><c- g>clientDataJSON</c-></code><a class="self-link" href="#dom-authenticatorassertionresponsejson-clientdatajson"></a></dfn>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring⑦"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticatorAssertionResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-authenticatorassertionresponsejson-authenticatordata"><code><c- g>authenticatorData</c-></code><a class="self-link" href="#dom-authenticatorassertionresponsejson-authenticatordata"></a></dfn>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring⑧"><c- n>Base64URLString</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticatorAssertionResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString " id="dom-authenticatorassertionresponsejson-signature"><code><c- g>signature</c-></code><a class="self-link" href="#dom-authenticatorassertionresponsejson-signature"></a></dfn>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring⑨"><c- n>Base64URLString</c-></a>? <dfn class="idl-code" data-dfn-for="AuthenticatorAssertionResponseJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString? " id="dom-authenticatorassertionresponsejson-userhandle"><code><c- g>userHandle</c-></code><a class="self-link" href="#dom-authenticatorassertionresponsejson-userhandle"></a></dfn>;
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationextensionsclientoutputsjson"><code><c- g>AuthenticationExtensionsClientOutputsJSON</c-></code></dfn> {
+};
+</pre>
+   <dl>
     <dt data-md><dfn class="idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="attribute" data-export id="dom-publickeycredential-type-slot"><code>[[type]]</code><a class="self-link" href="#dom-publickeycredential-type-slot"></a></dfn>
     <dd data-md>
-     <p>The <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential⑥">PublicKeyCredential</a></code> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object">interface object</a>'s <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-type-slot" id="ref-for-dom-credential-type-slot">[[type]]</a></code> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots②">internal slot</a>'s value is the string
+     <p>The <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential⑦">PublicKeyCredential</a></code> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object">interface object</a>'s <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-type-slot" id="ref-for-dom-credential-type-slot">[[type]]</a></code> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots②">internal slot</a>'s value is the string
 "<code>public-key</code>".</p>
      <p class="note" role="note"><span>Note:</span> This is reflected via the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-type" id="ref-for-dom-credential-type">type</a></code> attribute getter inherited from <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credential" id="ref-for-credential⑤">Credential</a></code>.</p>
     <dt data-md><dfn class="idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="attribute" data-export id="dom-publickeycredential-discovery-slot"><code>[[discovery]]</code><a class="self-link" href="#dom-publickeycredential-discovery-slot"></a></dfn>
     <dd data-md>
-     <p>The <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential⑦">PublicKeyCredential</a></code> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object①">interface object</a>'s <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-discovery-slot" id="ref-for-dom-credential-discovery-slot">[[discovery]]</a></code> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots③">internal slot</a>'s value is
+     <p>The <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential⑧">PublicKeyCredential</a></code> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object①">interface object</a>'s <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-discovery-slot" id="ref-for-dom-credential-discovery-slot">[[discovery]]</a></code> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots③">internal slot</a>'s value is
 "<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-discovery-remote" id="ref-for-dom-credential-discovery-remote">remote</a></code>".</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="attribute" data-export id="dom-publickeycredential-identifier-slot"><code>[[identifier]]</code></dfn>
     <dd data-md>
@@ -1885,9 +1938,9 @@ <h3 class="heading settled" data-level="5.1" id="iface-pkcredential"><span class
 For example, an authenticator without on-board storage may create identifiers containing a <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key⑦">credential private key</a> wrapped with a symmetric key that is burned into the authenticator.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="attribute" data-export id="dom-publickeycredential-clientextensionsresults-slot"><code>[[clientExtensionsResults]]</code></dfn>
     <dd data-md>
-     <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots⑤">internal slot</a> contains the results of processing client extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧①">Relying Party</a> upon the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧②">Relying Party</a>'s invocation of either <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑤">navigator.credentials.create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①①">navigator.credentials.get()</a></code>.</p>
+     <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots⑤">internal slot</a> contains the results of processing client extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧②">Relying Party</a> upon the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧③">Relying Party</a>'s invocation of either <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑤">navigator.credentials.create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①①">navigator.credentials.get()</a></code>.</p>
    </dl>
-   <p><code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential⑧">PublicKeyCredential</a></code>'s <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object②">interface object</a> inherits <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credential" id="ref-for-credential⑥">Credential</a></code>'s implementation of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#collectfromcredentialstore-origin-options-sameoriginwithancestors" id="ref-for-collectfromcredentialstore-origin-options-sameoriginwithancestors">[[CollectFromCredentialStore]](origin, options, sameOriginWithAncestors)</a></code>, and defines its own
+   <p><code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential⑨">PublicKeyCredential</a></code>'s <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object②">interface object</a> inherits <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credential" id="ref-for-credential⑥">Credential</a></code>'s implementation of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#collectfromcredentialstore-origin-options-sameoriginwithancestors" id="ref-for-collectfromcredentialstore-origin-options-sameoriginwithancestors">[[CollectFromCredentialStore]](origin, options, sameOriginWithAncestors)</a></code>, and defines its own
 implementation of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot①">[[Create]](origin, options, sameOriginWithAncestors)</a></code>, <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot①">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code>, and <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#store-credential-sameoriginwithancestors" id="ref-for-store-credential-sameoriginwithancestors">[[Store]](credential, sameOriginWithAncestors)</a></code>.</p>
    <h4 class="heading settled" data-level="5.1.1" id="sctn-credentialcreationoptions-extension"><span class="secno">5.1.1. </span><span class="content"><code>CredentialCreationOptions</code> Dictionary Extension</span><a class="self-link" href="#sctn-credentialcreationoptions-extension"></a></h4>
    <p>To support registration via <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑥">navigator.credentials.create()</a></code>, this document extends
@@ -1904,7 +1957,7 @@ <h4 class="heading settled" data-level="5.1.2" id="sctn-credentialrequestoptions
 </pre>
    <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span class="secno">5.1.3. </span><span class="content">Create a New Credential - PublicKeyCredential’s <code>[[Create]](origin, options, sameOriginWithAncestors)</code> Method</span><a class="self-link" href="#sctn-createCredential"></a></h4>
    <div data-link-for-hint="PublicKeyCredential/[[Create]](origin, options, sameOriginWithAncestors)">
-     <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential⑨">PublicKeyCredential</a></code>'s <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object③">interface object</a>'s implementation of the <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="[[Create]](origin, options, sameOriginWithAncestors)" id="dom-publickeycredential-create-slot"><code>[[Create]](origin,
+     <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⓪">PublicKeyCredential</a></code>'s <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-interface-object" id="ref-for-dfn-interface-object③">interface object</a>'s implementation of the <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="[[Create]](origin, options, sameOriginWithAncestors)" id="dom-publickeycredential-create-slot"><code>[[Create]](origin,
 options, sameOriginWithAncestors)</code></dfn> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots⑥">internal method</a> <a data-link-type="biblio" href="#biblio-credential-management-1">[CREDENTIAL-MANAGEMENT-1]</a> allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①①">WebAuthn Relying Party</a> scripts to call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑦">navigator.credentials.create()</a></code> to request the creation of a new <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source②⑥">public key credential source</a>, <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential⑦">bound</a> to an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑤">authenticator</a>. This <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create⑧">navigator.credentials.create()</a></code> operation can be aborted by leveraging the <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#abortcontroller" id="ref-for-abortcontroller">AbortController</a></code>;
 see <a href="https://dom.spec.whatwg.org/#abortcontroller-api-integration"><cite>DOM</cite> § 3.3 Using AbortController and AbortSignal objects in APIs</a> for detailed instructions. 
     <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots⑦">internal method</a> accepts three arguments:</p>
@@ -1935,8 +1988,8 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
       <p>Let <var>options</var> be the value of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-credentialcreationoptions-publickey" id="ref-for-dom-credentialcreationoptions-publickey③">publicKey</a></code></code>.</p>
      <li data-md>
       <p>If the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout">timeout</a></code> member of <var>options</var> is present, check if its value lies within a
-reasonable range as defined by the <a data-link-type="dfn" href="#client" id="ref-for-client①⑤">client</a> and if not, correct it to the closest value lying within that range. Set a timer <var>lifetimeTimer</var> to this adjusted value. If the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout①">timeout</a></code> member of <var>options</var> is not
-present, then set <var>lifetimeTimer</var> to a <a data-link-type="dfn" href="#client" id="ref-for-client①⑥">client</a>-specific default.</p>
+reasonable range as defined by the <a data-link-type="dfn" href="#client" id="ref-for-client①⑥">client</a> and if not, correct it to the closest value lying within that range. Set a timer <var>lifetimeTimer</var> to this adjusted value. If the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout①">timeout</a></code> member of <var>options</var> is not
+present, then set <var>lifetimeTimer</var> to a <a data-link-type="dfn" href="#client" id="ref-for-client①⑦">client</a>-specific default.</p>
       <p>Recommended ranges and defaults for the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout②">timeout</a></code> member of <var>options</var> are as follows.
       If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-authenticatorselection" id="ref-for-dom-publickeycredentialcreationoptions-authenticatorselection">authenticatorSelection</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification">userVerification</a></code></code></p>
       <dl class="switch">
@@ -2022,7 +2075,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
        <li data-md>
         <p>Let <var>authenticatorExtensionInput</var> be the (<a data-link-type="dfn" href="#cbor" id="ref-for-cbor②">CBOR</a>) result of running <var>extensionId</var>’s <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing①">client extension processing</a> algorithm on <var>clientExtensionInput</var>. If the algorithm returned an error, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue③">continue</a>.</p>
        <li data-md>
-        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-set" id="ref-for-map-set①">Set</a> <var>authenticatorExtensions</var>[<var>extensionId</var>] to the <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①">base64url encoding</a> of <var>authenticatorExtensionInput</var>.</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-set" id="ref-for-map-set①">Set</a> <var>authenticatorExtensions</var>[<var>extensionId</var>] to the <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding③">base64url encoding</a> of <var>authenticatorExtensionInput</var>.</p>
       </ol>
      <li data-md>
       <p>Let <var>collectedClientData</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata">CollectedClientData</a></code> instance whose fields are:</p>
@@ -2032,7 +2085,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
         <p>The string "webauthn.create".</p>
        <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge">challenge</a></code>
        <dd data-md>
-        <p>The <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding②">base64url encoding</a> of <var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge">challenge</a></code>.</p>
+        <p>The <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding④">base64url encoding</a> of <var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge">challenge</a></code>.</p>
        <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin">origin</a></code>
        <dd data-md>
         <p>The <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#ascii-serialisation-of-an-origin" id="ref-for-ascii-serialisation-of-an-origin">serialization of</a> <var>callerOrigin</var>.</p>
@@ -2052,7 +2105,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
      <li data-md>
       <p>Let <var>authenticators</var> represent a value which at any given instant is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①">set</a> of <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform①⑦">client platform</a>-specific handles, where each <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①">item</a> identifies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑥">authenticator</a> presently available on this <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform①⑧">client platform</a> at that instant.</p>
       <p class="note" role="note"><span>Note:</span> What qualifies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑦">authenticator</a> as "available" is intentionally unspecified; this is meant to represent how <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑧">authenticators</a> can be <a href="https://en.wikipedia.org/w/index.php?title=Hot_plug">hot-plugged</a> into (e.g., via USB)
-or discovered (e.g., via NFC or Bluetooth) by the <a data-link-type="dfn" href="#client" id="ref-for-client①⑦">client</a> by various mechanisms, or permanently built into the <a data-link-type="dfn" href="#client" id="ref-for-client①⑧">client</a>.</p>
+or discovered (e.g., via NFC or Bluetooth) by the <a data-link-type="dfn" href="#client" id="ref-for-client①⑧">client</a> by various mechanisms, or permanently built into the <a data-link-type="dfn" href="#client" id="ref-for-client①⑨">client</a>.</p>
      <li data-md>
       <p>Start <var>lifetimeTimer</var>.</p>
      <li data-md>
@@ -2114,7 +2167,7 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
              <dt data-md>is capable of <a data-link-type="dfn" href="#client-side-credential-storage-modality" id="ref-for-client-side-credential-storage-modality①">client-side credential storage modality</a>
              <dd data-md>
               <p>Let <var>requireResidentKey</var> be <code>true</code>.</p>
-             <dt data-md>is not capable of <a data-link-type="dfn" href="#client-side-credential-storage-modality" id="ref-for-client-side-credential-storage-modality②">client-side credential storage modality</a>, or if the <a data-link-type="dfn" href="#client" id="ref-for-client①⑨">client</a> cannot determine authenticator capability,
+             <dt data-md>is not capable of <a data-link-type="dfn" href="#client-side-credential-storage-modality" id="ref-for-client-side-credential-storage-modality②">client-side credential storage modality</a>, or if the <a data-link-type="dfn" href="#client" id="ref-for-client②⓪">client</a> cannot determine authenticator capability,
              <dd data-md>
               <p>Let <var>requireResidentKey</var> be <code>false</code>.</p>
             </dl>
@@ -2164,9 +2217,9 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
           <ol>
            <li data-md>
             <p>If <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports①">transports</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-is-empty" id="ref-for-list-is-empty③">is not empty</a>, and <var>authenticator</var> is connected over a transport not
-mentioned in <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports②">transports</a></code></code>, the client MAY <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue⑧">continue</a>.</p>
+mentioned in <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponsejson-transports" id="ref-for-dom-authenticatorattestationresponsejson-transports①">transports</a></code></code>, the client MAY <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue⑧">continue</a>.</p>
             <p class="note" role="note"><span>Note:</span> If the client chooses to <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue⑨">continue</a>, this could result in
-inadvertently registering multiple credentials <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential⑧">bound to</a> the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑨">authenticator</a> if the transport hints in <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports③">transports</a></code></code> are not accurate.
+inadvertently registering multiple credentials <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential⑧">bound to</a> the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑥⑨">authenticator</a> if the transport hints in <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports②">transports</a></code></code> are not accurate.
 For example, stored transport hints could become inaccurate
 as a result of software upgrades adding new connectivity options.</p>
            <li data-md>
@@ -2203,11 +2256,11 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
           <p>Throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#invalidstateerror" id="ref-for-invalidstateerror①">InvalidStateError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException⑦">DOMException</a></code>.</p>
         </ol>
         <p class="note" role="note"><span>Note:</span> This error status is handled separately because the <var>authenticator</var> returns it only if <var>excludeCredentialDescriptorList</var> identifies a credential <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential⑨">bound</a> to the <var>authenticator</var> and the user has <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent⑥">consented</a> to the operation. Given this explicit consent, it is acceptable for this case to be
-distinguishable to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧③">Relying Party</a>.</p>
+distinguishable to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧④">Relying Party</a>.</p>
        <dt data-md>If any <var>authenticator</var> returns an error status not equivalent to "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#invalidstateerror" id="ref-for-invalidstateerror②">InvalidStateError</a></code>",
        <dd data-md>
         <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove⑧">Remove</a> <var>authenticator</var> from <var>issuedRequests</var>.</p>
-        <p class="note" role="note"><span>Note:</span> This case does not imply <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent⑦">user consent</a> for the operation, so details about the error are hidden from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧④">Relying Party</a> in order to prevent leak of potentially identifying information. See <a href="#sctn-make-credential-privacy">§ 14.5.1 Registration Ceremony Privacy</a> for
+        <p class="note" role="note"><span>Note:</span> This case does not imply <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent⑦">user consent</a> for the operation, so details about the error are hidden from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑤">Relying Party</a> in order to prevent leak of potentially identifying information. See <a href="#sctn-make-credential-privacy">§ 14.5.1 Registration Ceremony Privacy</a> for
 details.</p>
        <dt data-md>If any <var>authenticator</var> indicates success,
        <dd data-md>
@@ -2259,15 +2312,15 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
 and/or more easily verifiable version of the same data (for example, by employing an <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca">Anonymization CA</a>).</p>
              <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-attestationconveyancepreference-direct" id="ref-for-dom-attestationconveyancepreference-direct">direct</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-attestationconveyancepreference-enterprise" id="ref-for-dom-attestationconveyancepreference-enterprise①">enterprise</a></code>
              <dd data-md>
-              <p>Convey the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦①">authenticator</a>'s <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid④">AAGUID</a> and <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③">attestation statement</a>, unaltered, to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑤">Relying Party</a>.</p>
+              <p>Convey the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦①">authenticator</a>'s <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid④">AAGUID</a> and <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③">attestation statement</a>, unaltered, to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑥">Relying Party</a>.</p>
             </dl>
            <li data-md>
-            <p>Let <var>attestationObject</var> be a new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor①">%ArrayBuffer%</a>, containing the
+            <p>Let <var>attestationObject</var> be a new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑤">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor①">%ArrayBuffer%</a>, containing the
 bytes of <code><var>credentialCreationData</var>.<a data-link-type="dfn" href="#credentialcreationdata-attestationobjectresult" id="ref-for-credentialcreationdata-attestationobjectresult④">attestationObjectResult</a></code>’s value.</p>
            <li data-md>
             <p>Let <var>id</var> be <code><var>attestationObject</var>.authData.<a data-link-type="dfn" href="#attestedcredentialdata" id="ref-for-attestedcredentialdata">attestedCredentialData</a>.<a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid">credentialId</a></code>.</p>
            <li data-md>
-            <p>Let <var>pubKeyCred</var> be a new <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⓪">PublicKeyCredential</a></code> object associated with <var>global</var> whose fields are:</p>
+            <p>Let <var>pubKeyCred</var> be a new <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①①">PublicKeyCredential</a></code> object associated with <var>global</var> whose fields are:</p>
             <dl>
              <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-identifier-slot" id="ref-for-dom-publickeycredential-identifier-slot②">[[identifier]]</a></code>
              <dd data-md>
@@ -2281,20 +2334,20 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
               <dl>
                <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorresponse-clientdatajson" id="ref-for-dom-authenticatorresponse-clientdatajson">clientDataJSON</a></code>
                <dd data-md>
-                <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer③">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor②">%ArrayBuffer%</a>, containing the bytes of <code><var>credentialCreationData</var>.<a data-link-type="dfn" href="#credentialcreationdata-clientdatajsonresult" id="ref-for-credentialcreationdata-clientdatajsonresult">clientDataJSONResult</a></code>.</p>
+                <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑥">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor②">%ArrayBuffer%</a>, containing the bytes of <code><var>credentialCreationData</var>.<a data-link-type="dfn" href="#credentialcreationdata-clientdatajsonresult" id="ref-for-credentialcreationdata-clientdatajsonresult">clientDataJSONResult</a></code>.</p>
                <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject">attestationObject</a></code>
                <dd data-md>
                 <p><var>attestationObject</var></p>
                <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-transports-slot" id="ref-for-dom-authenticatorattestationresponse-transports-slot">[[transports]]</a></code>
                <dd data-md>
-                <p>A sequence of zero or more unique <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③">DOMString</a></code>s, in lexicographical order, that the <var>authenticator</var> is believed to support. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport">AuthenticatorTransport</a></code>, but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform①⑨">client platforms</a> MUST ignore unknown values.</p>
-                <p>If a user agent does not wish to divulge this information it MAY substitute an arbitrary sequence designed to preserve privacy. This sequence MUST still be valid, i.e. lexicographically sorted and free of duplicates. For example, it may use the empty sequence. Either way, in this case the user agent takes the risk that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑥">Relying Party</a> behavior may be suboptimal.</p>
+                <p>A sequence of zero or more unique <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①①">DOMString</a></code>s, in lexicographical order, that the <var>authenticator</var> is believed to support. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport">AuthenticatorTransport</a></code>, but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform①⑨">client platforms</a> MUST ignore unknown values.</p>
+                <p>If a user agent does not wish to divulge this information it MAY substitute an arbitrary sequence designed to preserve privacy. This sequence MUST still be valid, i.e. lexicographically sorted and free of duplicates. For example, it may use the empty sequence. Either way, in this case the user agent takes the risk that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑦">Relying Party</a> behavior may be suboptimal.</p>
                 <p>If the user agent does not have any transport information, it SHOULD set this field to the empty sequence.</p>
                 <p class="note" role="note"><span>Note:</span> How user agents discover transports supported by a given <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦②">authenticator</a> is outside the scope of this specification, but may include information from an <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate②">attestation certificate</a> (for example <a data-link-type="biblio" href="#biblio-fido-transports-ext">[FIDO-Transports-Ext]</a>), metadata communicated in an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦③">authenticator</a> protocol such as CTAP2, or special-case knowledge about a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①①">platform authenticator</a>.</p>
               </dl>
              <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-clientextensionsresults-slot" id="ref-for-dom-publickeycredential-clientextensionsresults-slot①">[[clientExtensionsResults]]</a></code>
              <dd data-md>
-              <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer④">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor③">%ArrayBuffer%</a>, containing the bytes of <code><var>credentialCreationData</var>.<a data-link-type="dfn" href="#credentialcreationdata-clientextensionresults" id="ref-for-credentialcreationdata-clientextensionresults">clientExtensionResults</a></code>.</p>
+              <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑦">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor③">%ArrayBuffer%</a>, containing the bytes of <code><var>credentialCreationData</var>.<a data-link-type="dfn" href="#credentialcreationdata-clientextensionresults" id="ref-for-credentialcreationdata-clientextensionresults">clientExtensionResults</a></code>.</p>
             </dl>
            <li data-md>
             <p>Return <var>pubKeyCred</var>.</p>
@@ -2314,9 +2367,9 @@ <h4 class="heading settled" data-level="5.1.3" id="sctn-createCredential"><span
    </div>
    <h4 class="heading settled" data-level="5.1.4" id="sctn-getAssertion"><span class="secno">5.1.4. </span><span class="content">Use an Existing Credential to Make an Assertion - PublicKeyCredential’s <code>[[Get]](options)</code> Method</span><a class="self-link" href="#sctn-getAssertion"></a></h4>
    <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①②">WebAuthn Relying Parties</a> call <code><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①③">navigator.credentials.get({publicKey:..., ...})</a></code> to
-discover and use an existing <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential②⑥">public key credential</a>, with the <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent⑨">user’s consent</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑦">Relying Party</a> script optionally specifies some criteria
+discover and use an existing <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential②⑥">public key credential</a>, with the <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent⑨">user’s consent</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑧">Relying Party</a> script optionally specifies some criteria
 to indicate what <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#credential-source" id="ref-for-credential-source①">credential sources</a> are acceptable to it. The <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⓪">client platform</a> locates <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#credential-source" id="ref-for-credential-source②">credential sources</a> matching the specified criteria, and guides the user to pick one that the script will be allowed to use. The user may choose to
-decline the entire interaction even if a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#credential-source" id="ref-for-credential-source③">credential source</a> is present, for example to maintain privacy. If the user picks a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#credential-source" id="ref-for-credential-source④">credential source</a>, the user agent then uses <a href="#sctn-op-get-assertion">§ 6.3.3 The authenticatorGetAssertion Operation</a> to sign a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑧">Relying Party</a>-provided challenge and other collected data into an <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion⑨">authentication assertion</a>, which is used as a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential⑥">credential</a>.</p>
+decline the entire interaction even if a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#credential-source" id="ref-for-credential-source③">credential source</a> is present, for example to maintain privacy. If the user picks a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#credential-source" id="ref-for-credential-source④">credential source</a>, the user agent then uses <a href="#sctn-op-get-assertion">§ 6.3.3 The authenticatorGetAssertion Operation</a> to sign a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑨">Relying Party</a>-provided challenge and other collected data into an <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion⑨">authentication assertion</a>, which is used as a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential⑥">credential</a>.</p>
    <p>The <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①④">get()</a></code> implementation <a data-link-type="biblio" href="#biblio-credential-management-1">[CREDENTIAL-MANAGEMENT-1]</a> calls <code>PublicKeyCredential.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-collectfromcredentialstore-slot" id="ref-for-dom-publickeycredential-collectfromcredentialstore-slot">[[CollectFromCredentialStore]]()</a></code></code> to collect any <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential⑦">credentials</a> that
 should be available without <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#user-mediated" id="ref-for-user-mediated">user mediation</a> (roughly, this specification’s <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture①③">authorization gesture</a>), and if it does not find
 exactly one of those, it then calls <code>PublicKeyCredential.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot②">[[DiscoverFromExternalSource]]()</a></code></code> to have
@@ -2353,8 +2406,8 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
       <p>Let <var>options</var> be the value of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-credentialrequestoptions-publickey" id="ref-for-dom-credentialrequestoptions-publickey③">publicKey</a></code></code>.</p>
      <li data-md>
       <p>If the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout">timeout</a></code> member of <var>options</var> is present, check if its value lies
-within a reasonable range as defined by the <a data-link-type="dfn" href="#client" id="ref-for-client②⓪">client</a> and if not, correct it to the closest value lying within that range.
-Set a timer <var>lifetimeTimer</var> to this adjusted value. If the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout①">timeout</a></code> member of <var>options</var> is not present, then set <var>lifetimeTimer</var> to a <a data-link-type="dfn" href="#client" id="ref-for-client②①">client</a>-specific default.</p>
+within a reasonable range as defined by the <a data-link-type="dfn" href="#client" id="ref-for-client②①">client</a> and if not, correct it to the closest value lying within that range.
+Set a timer <var>lifetimeTimer</var> to this adjusted value. If the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout①">timeout</a></code> member of <var>options</var> is not present, then set <var>lifetimeTimer</var> to a <a data-link-type="dfn" href="#client" id="ref-for-client②②">client</a>-specific default.</p>
       <p>Recommended ranges and defaults for the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout②">timeout</a></code> member of <var>options</var> are as follows.
       If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-userverification" id="ref-for-dom-publickeycredentialrequestoptions-userverification">userVerification</a></code></code></p>
       <dl class="switch">
@@ -2407,7 +2460,7 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
        <li data-md>
         <p>Let <var>authenticatorExtensionInput</var> be the (<a data-link-type="dfn" href="#cbor" id="ref-for-cbor④">CBOR</a>) result of running <var>extensionId</var>’s <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing③">client extension processing</a> algorithm on <var>clientExtensionInput</var>. If the algorithm returned an error, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#iteration-continue" id="ref-for-iteration-continue①②">continue</a>.</p>
        <li data-md>
-        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-set" id="ref-for-map-set③">Set</a> <var>authenticatorExtensions</var>[<var>extensionId</var>] to the <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding③">base64url encoding</a> of <var>authenticatorExtensionInput</var>.</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-set" id="ref-for-map-set③">Set</a> <var>authenticatorExtensions</var>[<var>extensionId</var>] to the <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑤">base64url encoding</a> of <var>authenticatorExtensionInput</var>.</p>
       </ol>
      <li data-md>
       <p>Let <var>collectedClientData</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata①">CollectedClientData</a></code> instance whose fields are:</p>
@@ -2417,7 +2470,7 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
         <p>The string "webauthn.get".</p>
        <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge①">challenge</a></code>
        <dd data-md>
-        <p>The <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding④">base64url encoding</a> of <var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge">challenge</a></code></p>
+        <p>The <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑥">base64url encoding</a> of <var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge">challenge</a></code></p>
        <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin①">origin</a></code>
        <dd data-md>
         <p>The <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#ascii-serialisation-of-an-origin" id="ref-for-ascii-serialisation-of-an-origin①">serialization of</a> <var>callerOrigin</var>.</p>
@@ -2439,7 +2492,7 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
      <li data-md>
       <p>Let <var>authenticators</var> represent a value which at any given instant is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set③">set</a> of <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②②">client platform</a>-specific handles, where each <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item②">item</a> identifies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦④">authenticator</a> presently available on this <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②③">client platform</a> at that instant.</p>
       <p class="note" role="note"><span>Note:</span> What qualifies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⑤">authenticator</a> as "available" is intentionally unspecified; this is meant to represent how <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⑥">authenticators</a> can be <a href="https://en.wikipedia.org/w/index.php?title=Hot_plug">hot-plugged</a> into (e.g., via USB)
-or discovered (e.g., via NFC or Bluetooth) by the <a data-link-type="dfn" href="#client" id="ref-for-client②②">client</a> by various mechanisms, or permanently built into the <a data-link-type="dfn" href="#client" id="ref-for-client②③">client</a>.</p>
+or discovered (e.g., via NFC or Bluetooth) by the <a data-link-type="dfn" href="#client" id="ref-for-client②③">client</a> by various mechanisms, or permanently built into the <a data-link-type="dfn" href="#client" id="ref-for-client②④">client</a>.</p>
      <li data-md>
       <p>Start <var>lifetimeTimer</var>.</p>
      <li data-md>
@@ -2459,7 +2512,7 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
        <dt data-md>If <var>issuedRequests</var> is empty, <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials⑤">allowCredentials</a></code></code> is not empty, and no <var>authenticator</var> will become available for any <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential②⑧">public key credentials</a> therein,
        <dd data-md>
         <p>Indicate to the user that no eligible credential could be found. When the user acknowledges the dialog, throw a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑥">NotAllowedError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①③">DOMException</a></code>.</p>
-        <p class="note" role="note"><span>Note:</span> One way a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②④">client platform</a> can determine that no <var>authenticator</var> will become available is by examining the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports④">transports</a></code></code> members of the present <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item③">items</a> of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials⑥">allowCredentials</a></code></code>, if any. For example, if all <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item④">items</a> list only <code><code class="idl"><a data-link-type="idl" href="#dom-authenticatortransport-internal" id="ref-for-dom-authenticatortransport-internal">internal</a></code></code>, but all <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①②">platform</a> <var>authenticator</var>s have been tried, then there is no possibility of satisfying the request. Alternatively, all <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor②">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑤">items</a> may list <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑤">transports</a></code></code> that the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑤">client platform</a> does not support.</p>
+        <p class="note" role="note"><span>Note:</span> One way a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②④">client platform</a> can determine that no <var>authenticator</var> will become available is by examining the <code><code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponsejson-transports" id="ref-for-dom-authenticatorattestationresponsejson-transports②">transports</a></code></code> members of the present <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item③">items</a> of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials⑥">allowCredentials</a></code></code>, if any. For example, if all <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item④">items</a> list only <code><code class="idl"><a data-link-type="idl" href="#dom-authenticatortransport-internal" id="ref-for-dom-authenticatortransport-internal">internal</a></code></code>, but all <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①②">platform</a> <var>authenticator</var>s have been tried, then there is no possibility of satisfying the request. Alternatively, all <code><code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor②">PublicKeyCredentialDescriptor</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑤">items</a> may list <code><code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponsejson-transports" id="ref-for-dom-authenticatorattestationresponsejson-transports③">transports</a></code></code> that the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑤">client platform</a> does not support.</p>
        <dt data-md>If an <var>authenticator</var> becomes available on this <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①④">client device</a>,
        <dd data-md>
         <p class="note" role="note"><span>Note:</span> This includes the case where an <var>authenticator</var> was available upon <var>lifetimeTimer</var> initiation.</p>
@@ -2508,8 +2561,8 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
               <p>If <var>allowCredentialDescriptorList</var> has exactly one value, set <code><var>savedCredentialIds</var>[<var>authenticator</var>]</code> to <code><var>allowCredentialDescriptorList</var>[0].id</code>’s
 value (see <a href="#authenticatorGetAssertion-return-values">here</a> in <a href="#sctn-op-get-assertion">§ 6.3.3 The authenticatorGetAssertion Operation</a> for more information).</p>
              <li data-md>
-              <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①③">For each</a> credential descriptor <var>C</var> in <var>allowCredentialDescriptorList</var>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append①">append</a> each value, if any, of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑥">transports</a></code></code> to <var>distinctTransports</var>.</p>
-              <p class="note" role="note"><span>Note:</span> This will aggregate only distinct values of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑦">transports</a></code> (for this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⑦">authenticator</a>) in <var>distinctTransports</var> due to the properties of <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑤">ordered sets</a>.</p>
+              <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①③">For each</a> credential descriptor <var>C</var> in <var>allowCredentialDescriptorList</var>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append①">append</a> each value, if any, of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponsejson-transports" id="ref-for-dom-authenticatorattestationresponsejson-transports④">transports</a></code></code> to <var>distinctTransports</var>.</p>
+              <p class="note" role="note"><span>Note:</span> This will aggregate only distinct values of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponsejson-transports" id="ref-for-dom-authenticatorattestationresponsejson-transports⑤">transports</a></code> (for this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑦⑦">authenticator</a>) in <var>distinctTransports</var> due to the properties of <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set⑤">ordered sets</a>.</p>
              <li data-md>
               <p>If <var>distinctTransports</var></p>
               <dl class="switch">
@@ -2528,9 +2581,9 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
            <dt data-md><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-is-empty" id="ref-for-list-is-empty⑧">is empty</a>
            <dd data-md>
             <p>Using local configuration knowledge of the appropriate transport to use with <var>authenticator</var>, invoke the <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion⑤">authenticatorGetAssertion</a> operation on <var>authenticator</var> with <var>rpId</var>, <var>clientDataHash</var>, <var>userVerification</var> and <var>authenticatorExtensions</var> as parameters.</p>
-            <p class="note" role="note"><span>Note:</span> In this case, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑧⑨">Relying Party</a> did not supply a list of acceptable credential descriptors. Thus, the
+            <p class="note" role="note"><span>Note:</span> In this case, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⓪">Relying Party</a> did not supply a list of acceptable credential descriptors. Thus, the
     authenticator is being asked to exercise any credential it may possess that is <a data-link-type="dfn" href="#scope" id="ref-for-scope⑨">scoped</a> to
-    the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⓪">Relying Party</a>, as identified by <var>rpId</var>.</p>
+    the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨①">Relying Party</a>, as identified by <var>rpId</var>.</p>
           </dl>
          <li data-md>
           <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append②">Append</a> <var>authenticator</var> to <var>issuedRequests</var>.</p>
@@ -2585,11 +2638,11 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
           <p>Let <var>constructAssertionAlg</var> be an algorithm that takes a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-global" id="ref-for-concept-settings-object-global①">global object</a> <var>global</var>, and whose steps are:</p>
           <ol>
            <li data-md>
-            <p>Let <var>pubKeyCred</var> be a new <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①①">PublicKeyCredential</a></code> object associated with <var>global</var> whose fields are:</p>
+            <p>Let <var>pubKeyCred</var> be a new <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①②">PublicKeyCredential</a></code> object associated with <var>global</var> whose fields are:</p>
             <dl>
              <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-identifier-slot" id="ref-for-dom-publickeycredential-identifier-slot③">[[identifier]]</a></code>
              <dd data-md>
-              <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑤">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor④">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-credentialidresult" id="ref-for-assertioncreationdata-credentialidresult②">credentialIdResult</a></code>.</p>
+              <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑧">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor④">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-credentialidresult" id="ref-for-assertioncreationdata-credentialidresult②">credentialIdResult</a></code>.</p>
              <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-authenticatorattachment" id="ref-for-dom-publickeycredential-authenticatorattachment③">authenticatorAttachment</a></code>
              <dd data-md>
               <p>The <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatorattachment" id="ref-for-enumdef-authenticatorattachment②">AuthenticatorAttachment</a></code> value matching the current <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality④">authenticator attachment modality</a> of <var>authenticator</var>.</p>
@@ -2599,21 +2652,21 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
               <dl>
                <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorresponse-clientdatajson" id="ref-for-dom-authenticatorresponse-clientdatajson①">clientDataJSON</a></code>
                <dd data-md>
-                <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑥">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑤">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-clientdatajsonresult" id="ref-for-assertioncreationdata-clientdatajsonresult">clientDataJSONResult</a></code>.</p>
+                <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑨">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑤">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-clientdatajsonresult" id="ref-for-assertioncreationdata-clientdatajsonresult">clientDataJSONResult</a></code>.</p>
                <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorassertionresponse-authenticatordata" id="ref-for-dom-authenticatorassertionresponse-authenticatordata">authenticatorData</a></code>
                <dd data-md>
-                <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑦">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑥">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-authenticatordataresult" id="ref-for-assertioncreationdata-authenticatordataresult">authenticatorDataResult</a></code>.</p>
+                <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⓪">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑥">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-authenticatordataresult" id="ref-for-assertioncreationdata-authenticatordataresult">authenticatorDataResult</a></code>.</p>
                <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorassertionresponse-signature" id="ref-for-dom-authenticatorassertionresponse-signature">signature</a></code>
                <dd data-md>
-                <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑧">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑦">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-signatureresult" id="ref-for-assertioncreationdata-signatureresult">signatureResult</a></code>.</p>
+                <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①①">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑦">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-signatureresult" id="ref-for-assertioncreationdata-signatureresult">signatureResult</a></code>.</p>
                <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorassertionresponse-userhandle" id="ref-for-dom-authenticatorassertionresponse-userhandle②">userHandle</a></code>
                <dd data-md>
                 <p>If <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-userhandleresult" id="ref-for-assertioncreationdata-userhandleresult②">userHandleResult</a></code> is null, set this
-field to null. Otherwise, set this field to a new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer⑨">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑧">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-userhandleresult" id="ref-for-assertioncreationdata-userhandleresult③">userHandleResult</a></code>.</p>
+field to null. Otherwise, set this field to a new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①②">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑧">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-userhandleresult" id="ref-for-assertioncreationdata-userhandleresult③">userHandleResult</a></code>.</p>
               </dl>
              <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-clientextensionsresults-slot" id="ref-for-dom-publickeycredential-clientextensionsresults-slot②">[[clientExtensionsResults]]</a></code>
              <dd data-md>
-              <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⓪">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑨">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-clientextensionresults" id="ref-for-assertioncreationdata-clientextensionresults">clientExtensionResults</a></code>.</p>
+              <p>A new <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①③">ArrayBuffer</a></code>, created using <var>global</var>’s <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-arraybuffer-constructor" id="ref-for-sec-arraybuffer-constructor⑨">%ArrayBuffer%</a>, containing the bytes of <code><var>assertionCreationData</var>.<a data-link-type="dfn" href="#assertioncreationdata-clientextensionresults" id="ref-for-assertioncreationdata-clientextensionresults">clientExtensionResults</a></code>.</p>
             </dl>
            <li data-md>
             <p>Return <var>pubKeyCred</var>.</p>
@@ -2635,13 +2688,13 @@ <h5 class="heading settled" data-level="5.1.4.1" id="sctn-discover-from-external
    <h4 class="heading settled" data-level="5.1.5" id="sctn-storeCredential"><span class="secno">5.1.5. </span><span class="content">Store an Existing Credential - PublicKeyCredential’s <code>[[Store]](credential, sameOriginWithAncestors)</code> Method</span><a class="self-link" href="#sctn-storeCredential"></a></h4>
    <div data-link-for-hint="PublicKeyCredential/[[Store]](credential, sameOriginWithAncestors)">
     <p>The <dfn class="idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export id="dom-publickeycredential-store-slot"><code>[[Store]](credential, sameOriginWithAncestors)</code><a class="self-link" href="#dom-publickeycredential-store-slot"></a></dfn> method is not supported
-for Web Authentication’s <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①②">PublicKeyCredential</a></code> type, so it always throws an error.</p>
+for Web Authentication’s <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①③">PublicKeyCredential</a></code> type, so it always throws an error.</p>
     <p class="note" role="note"><span>Note:</span> This algorithm is synchronous; the <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise③">Promise</a></code> resolution/rejection is handled by <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-store" id="ref-for-dom-credentialscontainer-store">navigator.credentials.store()</a></code>.</p>
     <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots①③">internal method</a> accepts two arguments:</p>
     <dl>
      <dt data-md><dfn class="idl-code" data-dfn-for="PublicKeyCredential/[[Store]](credential, sameOriginWithAncestors)" data-dfn-type="argument" data-export id="dom-publickeycredential-store-credential-sameoriginwithancestors-credential"><code>credential</code><a class="self-link" href="#dom-publickeycredential-store-credential-sameoriginwithancestors-credential"></a></dfn>
      <dd data-md>
-      <p>This argument is a <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①③">PublicKeyCredential</a></code> object.</p>
+      <p>This argument is a <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①④">PublicKeyCredential</a></code> object.</p>
      <dt data-md><dfn class="idl-code" data-dfn-for="PublicKeyCredential/[[Store]](credential, sameOriginWithAncestors)" data-dfn-type="argument" data-export id="dom-publickeycredential-store-credential-sameoriginwithancestors-sameoriginwithancestors"><code>sameOriginWithAncestors</code><a class="self-link" href="#dom-publickeycredential-store-credential-sameoriginwithancestors-sameoriginwithancestors"></a></dfn>
      <dd data-md>
       <p>This argument is a Boolean value which is <code>true</code> if and only if the caller’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#environment-settings-object" id="ref-for-environment-settings-object②">environment settings object</a> is <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#same-origin-with-its-ancestors" id="ref-for-same-origin-with-its-ancestors②">same-origin with its ancestors</a>.</p>
@@ -2662,10 +2715,10 @@ <h4 class="heading settled" data-level="5.1.6" id="sctn-preventSilentAccessCrede
    <h4 class="heading settled" data-level="5.1.7" id="sctn-isUserVerifyingPlatformAuthenticatorAvailable"><span class="secno">5.1.7. </span><span class="content">Availability of <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator②">User-Verifying Platform Authenticator</a> - PublicKeyCredential’s <code>isUserVerifyingPlatformAuthenticatorAvailable()</code> Method</span><a class="self-link" href="#sctn-isUserVerifyingPlatformAuthenticatorAvailable"></a></h4>
    <div data-link-for-hint="WebAuthentication/isUserVerifyingPlatformAuthenticatorAvailable">
     <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①③">WebAuthn Relying Parties</a> use this method to determine whether they can create a new credential using a <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator③">user-verifying platform authenticator</a>.
-Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client②④">client</a> employs a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑦">client platform</a>-specific procedure to discover available <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator④">user-verifying platform authenticators</a>.
+Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client②⑤">client</a> employs a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑦">client platform</a>-specific procedure to discover available <a data-link-type="dfn" href="#user-verifying-platform-authenticator" id="ref-for-user-verifying-platform-authenticator④">user-verifying platform authenticators</a>.
 If any are discovered, the promise is resolved with the value of <code>true</code>.
 Otherwise, the promise is resolved with the value of <code>false</code>.
-Based on the result, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨①">Relying Party</a> can take further actions to guide the user to create a credential.</p>
+Based on the result, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨②">Relying Party</a> can take further actions to guide the user to create a credential.</p>
     <p>This method has no arguments and returns a Boolean value.</p>
     <div class="mdn-anno wrapped">
      <button class="mdn-anno-btn"><b class="all-engines-flag" title="This feature is in all current engines.">✔</b><span>MDN</span></button>
@@ -2675,20 +2728,90 @@ <h4 class="heading settled" data-level="5.1.7" id="sctn-isUserVerifyingPlatformA
       <div class="support">
        <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
        <hr>
-       <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+       <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
        <hr>
        <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
        <hr>
-       <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>49+</span></span>
+       <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android no"><span>Opera Mobile</span><span>?</span></span>
       </div>
      </div>
     </div>
-<pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential" id="ref-for-publickeycredential①④"><c- g>PublicKeyCredential</c-></a> {
+<pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential" id="ref-for-publickeycredential①⑤"><c- g>PublicKeyCredential</c-></a> {
     <c- b>static</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise④"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean"><c- b>boolean</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="isUserVerifyingPlatformAuthenticatorAvailable()" id="dom-publickeycredential-isuserverifyingplatformauthenticatoravailable"><code><c- g>isUserVerifyingPlatformAuthenticatorAvailable</c-></code></dfn>();
 };
 </pre>
     <p class="note" role="note"><span>Note:</span> Invoking this method from a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#browsing-context" id="ref-for-browsing-context①">browsing context</a> where the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①①">Web Authentication API</a> is "disabled" according to the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#allowed-to-use" id="ref-for-allowed-to-use">allowed to use</a> algorithm—i.e., by a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/dom.html#concept-document-permissions-policy" id="ref-for-concept-document-permissions-policy①">permissions policy</a>—will result in the promise being rejected with a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑥">DOMException</a></code> whose name is "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notallowederror" id="ref-for-notallowederror⑧">NotAllowedError</a></code>". See also <a href="#sctn-permissions-policy">§ 5.9 Permissions Policy integration</a>.</p>
    </div>
+   <h4 class="heading settled" data-level="5.1.8" id="sctn-parseCreationOptionsFromJSON"><span class="secno">5.1.8. </span><span class="content">Deserialize Registration ceremony options - PublicKeyCredential’s <code>parseCreationOptionsFromJSON()</code> Method</span><a class="self-link" href="#sctn-parseCreationOptionsFromJSON"></a></h4>
+   <div data-link-for-hint="WebAuthentication/parseCreationOptionsFromJSON">
+    <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①④">WebAuthn Relying Parties</a> use this method to convert <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types①">JSON type</a> representations of options for <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①②">navigator.credentials.create()</a></code> into <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions②">PublicKeyCredentialCreationOptions</a></code>.</p>
+    <p>Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client②⑥">client</a> MUST convert the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-parsecreationoptionsfromjson-options-options" id="ref-for-dom-publickeycredential-parsecreationoptionsfromjson-options-options">options</a></code> argument into a new,
+identically-structured <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions③">PublicKeyCredentialCreationOptions</a></code> object, using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑦">base64url encoding</a> to decode any <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①②">DOMString</a></code> attributes in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptionsjson" id="ref-for-dictdef-publickeycredentialcreationoptionsjson">PublicKeyCredentialCreationOptionsJSON</a></code> that correspond
+to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-buffer-source-type" id="ref-for-dfn-buffer-source-type">buffer source type</a> attributes in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions④">PublicKeyCredentialCreationOptions</a></code>. This conversion MUST
+also apply to any <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input">client extension inputs</a> processed by the <a data-link-type="dfn" href="#client" id="ref-for-client②⑦">client</a>.</p>
+    <p><code class="idl"><a data-link-type="idl" href="#dictdef-authenticationextensionsclientinputsjson" id="ref-for-dictdef-authenticationextensionsclientinputsjson">AuthenticationExtensionsClientInputsJSON</a></code> MAY include extensions registered in the IANA
+"WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries">[IANA-WebAuthn-Registries]</a> but not defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.</p>
+    <p>If the <a data-link-type="dfn" href="#client" id="ref-for-client②⑧">client</a> encounters any issues parsing any of the <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types②">JSON type</a> representations then it
+MUST throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#encodingerror" id="ref-for-encodingerror">EncodingError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑦">DOMException</a></code> with a description of the incompatible
+value and terminate the operation.</p>
+<pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential" id="ref-for-publickeycredential①⑥"><c- g>PublicKeyCredential</c-></a> {
+    <c- b>static</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑤"><c- n>PublicKeyCredentialCreationOptions</c-></a> <dfn class="idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="parseCreationOptionsFromJSON(options)" id="dom-publickeycredential-parsecreationoptionsfromjson"><code><c- g>parseCreationOptionsFromJSON</c-></code><a class="self-link" href="#dom-publickeycredential-parsecreationoptionsfromjson"></a></dfn>(<a data-link-type="idl-name" href="#dictdef-publickeycredentialcreationoptionsjson" id="ref-for-dictdef-publickeycredentialcreationoptionsjson①"><c- n>PublicKeyCredentialCreationOptionsJSON</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential/parseCreationOptionsFromJSON(options)" data-dfn-type="argument" data-export id="dom-publickeycredential-parsecreationoptionsfromjson-options-options"><code><c- g>options</c-></code></dfn>);
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialcreationoptionsjson"><code><c- g>PublicKeyCredentialCreationOptionsJSON</c-></code></dfn> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity"><c- n>PublicKeyCredentialRpEntity</c-></a>                    <dfn class="idl-code" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="PublicKeyCredentialRpEntity                    " id="dom-publickeycredentialcreationoptionsjson-rp"><code><c- g>rp</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-rp"></a></dfn>;
+    <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialuserentityjson" id="ref-for-dictdef-publickeycredentialuserentityjson"><c- n>PublicKeyCredentialUserEntityJSON</c-></a>              <dfn class="idl-code" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="PublicKeyCredentialUserEntityJSON              " id="dom-publickeycredentialcreationoptionsjson-user"><code><c- g>user</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-user"></a></dfn>;
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring①⓪"><c- n>Base64URLString</c-></a>                                <dfn class="idl-code" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString                                " id="dom-publickeycredentialcreationoptionsjson-challenge"><code><c- g>challenge</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-challenge"></a></dfn>;
+    <c- b>required</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters"><c- n>PublicKeyCredentialParameters</c-></a>>        <dfn class="idl-code" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="sequence<PublicKeyCredentialParameters>        " id="dom-publickeycredentialcreationoptionsjson-pubkeycredparams"><code><c- g>pubKeyCredParams</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-pubkeycredparams"></a></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long"><c- b>unsigned</c-> <c- b>long</c-></a>                                           <dfn class="idl-code" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="unsigned long                                           " id="dom-publickeycredentialcreationoptionsjson-timeout"><code><c- g>timeout</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-timeout"></a></dfn>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence②"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptorjson" id="ref-for-dictdef-publickeycredentialdescriptorjson"><c- n>PublicKeyCredentialDescriptorJSON</c-></a>>             <dfn class="idl-code" data-default="[]" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="sequence<PublicKeyCredentialDescriptorJSON>             " id="dom-publickeycredentialcreationoptionsjson-excludecredentials"><code><c- g>excludeCredentials</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-excludecredentials"></a></dfn> = [];
+    <a data-link-type="idl-name" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria"><c- n>AuthenticatorSelectionCriteria</c-></a>                          <dfn class="idl-code" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="AuthenticatorSelectionCriteria                          " id="dom-publickeycredentialcreationoptionsjson-authenticatorselection"><code><c- g>authenticatorSelection</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-authenticatorselection"></a></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①③"><c- b>DOMString</c-></a>                                               <dfn class="idl-code" data-default="&quot;none&quot;" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="DOMString                                               " id="dom-publickeycredentialcreationoptionsjson-attestation"><code><c- g>attestation</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-attestation"></a></dfn> = "none";
+    <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputsjson" id="ref-for-dictdef-authenticationextensionsclientinputsjson①"><c- n>AuthenticationExtensionsClientInputsJSON</c-></a>                <dfn class="idl-code" data-dfn-for="PublicKeyCredentialCreationOptionsJSON" data-dfn-type="dict-member" data-export data-type="AuthenticationExtensionsClientInputsJSON                " id="dom-publickeycredentialcreationoptionsjson-extensions"><code><c- g>extensions</c-></code><a class="self-link" href="#dom-publickeycredentialcreationoptionsjson-extensions"></a></dfn>;
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialuserentityjson"><code><c- g>PublicKeyCredentialUserEntityJSON</c-></code></dfn> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring①①"><c- n>Base64URLString</c-></a>        <dfn class="idl-code" data-dfn-for="PublicKeyCredentialUserEntityJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString        " id="dom-publickeycredentialuserentityjson-id"><code><c- g>id</c-></code><a class="self-link" href="#dom-publickeycredentialuserentityjson-id"></a></dfn>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①④"><c- b>DOMString</c-></a>              <dfn class="idl-code" data-dfn-for="PublicKeyCredentialUserEntityJSON" data-dfn-type="dict-member" data-export data-type="DOMString              " id="dom-publickeycredentialuserentityjson-name"><code><c- g>name</c-></code><a class="self-link" href="#dom-publickeycredentialuserentityjson-name"></a></dfn>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑤"><c- b>DOMString</c-></a>              <dfn class="idl-code" data-dfn-for="PublicKeyCredentialUserEntityJSON" data-dfn-type="dict-member" data-export data-type="DOMString              " id="dom-publickeycredentialuserentityjson-displayname"><code><c- g>displayName</c-></code><a class="self-link" href="#dom-publickeycredentialuserentityjson-displayname"></a></dfn>;
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialdescriptorjson"><code><c- g>PublicKeyCredentialDescriptorJSON</c-></code></dfn> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring①②"><c- n>Base64URLString</c-></a>        <dfn class="idl-code" data-dfn-for="PublicKeyCredentialDescriptorJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString        " id="dom-publickeycredentialdescriptorjson-id"><code><c- g>id</c-></code><a class="self-link" href="#dom-publickeycredentialdescriptorjson-id"></a></dfn>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑥"><c- b>DOMString</c-></a>              <dfn class="idl-code" data-dfn-for="PublicKeyCredentialDescriptorJSON" data-dfn-type="dict-member" data-export data-type="DOMString              " id="dom-publickeycredentialdescriptorjson-type"><code><c- g>type</c-></code><a class="self-link" href="#dom-publickeycredentialdescriptorjson-type"></a></dfn>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence③"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑦"><c- b>DOMString</c-></a>>             <dfn class="idl-code" data-dfn-for="PublicKeyCredentialDescriptorJSON" data-dfn-type="dict-member" data-export data-type="sequence<DOMString>             " id="dom-publickeycredentialdescriptorjson-transports"><code><c- g>transports</c-></code><a class="self-link" href="#dom-publickeycredentialdescriptorjson-transports"></a></dfn>;
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationextensionsclientinputsjson"><code><c- g>AuthenticationExtensionsClientInputsJSON</c-></code></dfn> {
+};
+</pre>
+   </div>
+   <h4 class="heading settled" data-level="5.1.9" id="sctn-parseRequestOptionsFromJSON"><span class="secno">5.1.9. </span><span class="content">Deserialize Authentication ceremony options - PublicKeyCredential’s <code>parseRequestOptionsFromJSON()</code> Methods</span><a class="self-link" href="#sctn-parseRequestOptionsFromJSON"></a></h4>
+   <div data-link-for-hint="WebAuthentication/parseRequestOptionsFromJSON">
+    <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑤">WebAuthn Relying Parties</a> use this method to convert <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types③">JSON type</a> representations of options for <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①⑨">navigator.credentials.get()</a></code> into <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions②">PublicKeyCredentialRequestOptions</a></code>.</p>
+    <p>Upon invocation, the <a data-link-type="dfn" href="#client" id="ref-for-client②⑨">client</a> MUST convert the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-parserequestoptionsfromjson-options-options" id="ref-for-dom-publickeycredential-parserequestoptionsfromjson-options-options">options</a></code> argument into a new,
+identically-structured <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions③">PublicKeyCredentialRequestOptions</a></code> object, using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑧">base64url encoding</a> to decode any <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑧">DOMString</a></code> attributes in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptionsjson" id="ref-for-dictdef-publickeycredentialrequestoptionsjson">PublicKeyCredentialRequestOptionsJSON</a></code> that correspond
+to <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-buffer-source-type" id="ref-for-dfn-buffer-source-type①">buffer source type</a> attributes in <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions④">PublicKeyCredentialRequestOptions</a></code>. This conversion MUST
+also apply to any <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①">client extension inputs</a> processed by the <a data-link-type="dfn" href="#client" id="ref-for-client③⓪">client</a>.</p>
+    <p><code class="idl"><a data-link-type="idl" href="#dictdef-authenticationextensionsclientinputsjson" id="ref-for-dictdef-authenticationextensionsclientinputsjson②">AuthenticationExtensionsClientInputsJSON</a></code> MAY include extensions registered in the IANA
+"WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries">[IANA-WebAuthn-Registries]</a> but not defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.</p>
+    <p>If the <a data-link-type="dfn" href="#client" id="ref-for-client③①">client</a> encounters any issues parsing any of the <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-json-types" id="ref-for-dfn-json-types④">JSON type</a> representations then it
+MUST throw an "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#encodingerror" id="ref-for-encodingerror①">EncodingError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑧">DOMException</a></code> with a description of the incompatible
+value and terminate the operation.</p>
+<pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential" id="ref-for-publickeycredential①⑦"><c- g>PublicKeyCredential</c-></a> {
+    <c- b>static</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑤"><c- n>PublicKeyCredentialRequestOptions</c-></a> <dfn class="idl-code" data-dfn-for="PublicKeyCredential" data-dfn-type="method" data-export data-lt="parseRequestOptionsFromJSON(options)" id="dom-publickeycredential-parserequestoptionsfromjson"><code><c- g>parseRequestOptionsFromJSON</c-></code><a class="self-link" href="#dom-publickeycredential-parserequestoptionsfromjson"></a></dfn>(<a data-link-type="idl-name" href="#dictdef-publickeycredentialrequestoptionsjson" id="ref-for-dictdef-publickeycredentialrequestoptionsjson①"><c- n>PublicKeyCredentialRequestOptionsJSON</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredential/parseRequestOptionsFromJSON(options)" data-dfn-type="argument" data-export id="dom-publickeycredential-parserequestoptionsfromjson-options-options"><code><c- g>options</c-></code></dfn>);
+};
+
+<c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialrequestoptionsjson"><code><c- g>PublicKeyCredentialRequestOptionsJSON</c-></code></dfn> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring" id="ref-for-typedefdef-base64urlstring①③"><c- n>Base64URLString</c-></a>                                <dfn class="idl-code" data-dfn-for="PublicKeyCredentialRequestOptionsJSON" data-dfn-type="dict-member" data-export data-type="Base64URLString                                " id="dom-publickeycredentialrequestoptionsjson-challenge"><code><c- g>challenge</c-></code><a class="self-link" href="#dom-publickeycredentialrequestoptionsjson-challenge"></a></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①"><c- b>unsigned</c-> <c- b>long</c-></a>                                           <dfn class="idl-code" data-dfn-for="PublicKeyCredentialRequestOptionsJSON" data-dfn-type="dict-member" data-export data-type="unsigned long                                           " id="dom-publickeycredentialrequestoptionsjson-timeout"><code><c- g>timeout</c-></code><a class="self-link" href="#dom-publickeycredentialrequestoptionsjson-timeout"></a></dfn>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑨"><c- b>DOMString</c-></a>                                               <dfn class="idl-code" data-dfn-for="PublicKeyCredentialRequestOptionsJSON" data-dfn-type="dict-member" data-export data-type="DOMString                                               " id="dom-publickeycredentialrequestoptionsjson-rpid"><code><c- g>rpId</c-></code><a class="self-link" href="#dom-publickeycredentialrequestoptionsjson-rpid"></a></dfn>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence④"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptorjson" id="ref-for-dictdef-publickeycredentialdescriptorjson①"><c- n>PublicKeyCredentialDescriptorJSON</c-></a>>             <dfn class="idl-code" data-default="[]" data-dfn-for="PublicKeyCredentialRequestOptionsJSON" data-dfn-type="dict-member" data-export data-type="sequence<PublicKeyCredentialDescriptorJSON>             " id="dom-publickeycredentialrequestoptionsjson-allowcredentials"><code><c- g>allowCredentials</c-></code><a class="self-link" href="#dom-publickeycredentialrequestoptionsjson-allowcredentials"></a></dfn> = [];
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⓪"><c- b>DOMString</c-></a>                                               <dfn class="idl-code" data-default="&quot;preferred&quot;" data-dfn-for="PublicKeyCredentialRequestOptionsJSON" data-dfn-type="dict-member" data-export data-type="DOMString                                               " id="dom-publickeycredentialrequestoptionsjson-userverification"><code><c- g>userVerification</c-></code><a class="self-link" href="#dom-publickeycredentialrequestoptionsjson-userverification"></a></dfn> = "preferred";
+    <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputsjson" id="ref-for-dictdef-authenticationextensionsclientinputsjson③"><c- n>AuthenticationExtensionsClientInputsJSON</c-></a>                <dfn class="idl-code" data-dfn-for="PublicKeyCredentialRequestOptionsJSON" data-dfn-type="dict-member" data-export data-type="AuthenticationExtensionsClientInputsJSON                " id="dom-publickeycredentialrequestoptionsjson-extensions"><code><c- g>extensions</c-></code><a class="self-link" href="#dom-publickeycredentialrequestoptionsjson-extensions"></a></dfn>;
+};
+</pre>
+   </div>
    <h3 class="heading settled" data-level="5.2" id="iface-authenticatorresponse"><span class="secno">5.2. </span><span class="content">Authenticator Responses (interface <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="authenticatorresponse"><code>AuthenticatorResponse</code></dfn>)</span><a class="self-link" href="#iface-authenticatorresponse"></a></h3>
    <div class="mdn-anno wrapped after">
     <button class="mdn-anno-btn"><b class="all-engines-flag" title="This feature is in all current engines.">✔</b><span>MDN</span></button>
@@ -2698,18 +2821,18 @@ <h3 class="heading settled" data-level="5.2" id="iface-authenticatorresponse"><s
      <div class="support">
       <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
       <hr>
-      <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+      <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
       <hr>
       <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
       <hr>
-      <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
+      <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
      </div>
     </div>
    </div>
-   <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧②">Authenticators</a> respond to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨②">Relying Party</a> requests by returning an object derived from the <code class="idl"><a data-link-type="idl" href="#authenticatorresponse" id="ref-for-authenticatorresponse②">AuthenticatorResponse</a></code> interface:</p>
+   <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧②">Authenticators</a> respond to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨③">Relying Party</a> requests by returning an object derived from the <code class="idl"><a data-link-type="idl" href="#authenticatorresponse" id="ref-for-authenticatorresponse②">AuthenticatorResponse</a></code> interface:</p>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext" id="ref-for-SecureContext①"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed①"><c- g>Exposed</c-></a>=<c- n>Window</c->]
 <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#authenticatorresponse" id="ref-for-authenticatorresponse③"><c- g>AuthenticatorResponse</c-></a> {
-    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject③"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①①"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorresponse-clientdatajson" id="ref-for-dom-authenticatorresponse-clientdatajson②"><c- g>clientDataJSON</c-></a>;
+    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject③"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①④"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorresponse-clientdatajson" id="ref-for-dom-authenticatorresponse-clientdatajson②"><c- g>clientDataJSON</c-></a>;
 };
 </pre>
    <div>
@@ -2723,18 +2846,18 @@ <h3 class="heading settled" data-level="5.2" id="iface-authenticatorresponse"><s
         <div class="support">
          <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
          <hr>
-         <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+         <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
          <hr>
          <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
          <hr>
-         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
+         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
         </div>
        </div>
       </div>
-      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorResponse" data-dfn-type="attribute" data-export id="dom-authenticatorresponse-clientdatajson"><code>clientDataJSON</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①②">ArrayBuffer</a>, readonly</span></p>
+      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorResponse" data-dfn-type="attribute" data-export id="dom-authenticatorresponse-clientdatajson"><code>clientDataJSON</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑤">ArrayBuffer</a>, readonly</span></p>
      <dd data-md>
       <p>This attribute contains a <a href="#clientdatajson-serialization">JSON-compatible serialization</a> of the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data">client data</a>, the <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data②">hash of which</a> is passed to the
-authenticator by the client in its call to either <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①②">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get①⑨">get()</a></code> (i.e., the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①">client data</a> itself is not sent to the authenticator).</p>
+authenticator by the client in its call to either <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①③">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⓪">get()</a></code> (i.e., the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①">client data</a> itself is not sent to the authenticator).</p>
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.2.1" id="iface-authenticatorattestationresponse"><span class="secno">5.2.1. </span><span class="content">Information About Public Key Credential (interface <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="authenticatorattestationresponse"><code>AuthenticatorAttestationResponse</code></dfn>)</span><a class="self-link" href="#iface-authenticatorattestationresponse"></a></h4>
@@ -2746,40 +2869,39 @@ <h4 class="heading settled" data-level="5.2.1" id="iface-authenticatorattestatio
      <div class="support">
       <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
       <hr>
-      <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+      <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
       <hr>
       <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
       <hr>
-      <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
+      <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
      </div>
     </div>
    </div>
    <p>The <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse②">AuthenticatorAttestationResponse</a></code> interface represents the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧③">authenticator</a>'s response to a client’s request
 for the creation of a new <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⓪">public key credential</a>. It contains information about the new credential that can be used to
-identify it for later use, and metadata that can be used by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①④">WebAuthn Relying Party</a> to assess the characteristics of the credential
+identify it for later use, and metadata that can be used by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑥">WebAuthn Relying Party</a> to assess the characteristics of the credential
 during registration.</p>
    <div class="mdn-anno wrapped">
-    <button class="mdn-anno-btn"><b class="less-than-two-engines-flag" title="This feature is in less than two current engines.">⚠</b><span>MDN</span></button>
+    <button class="mdn-anno-btn"><span>MDN</span></button>
     <div class="feature">
      <p><a href="https://developer.mozilla.org/en-US/docs/Web/API/AuthenticatorAttestationResponse/getTransports" title="getTransports() is a method of the AuthenticatorAttestationResponse interface that returns an Array containing strings describing the different transports which may be used by the authenticator.">AuthenticatorAttestationResponse/getTransports</a></p>
-     <p class="less-than-two-engines-text">In only one current engine.</p>
      <div class="support">
-      <span class="firefox no"><span>Firefox</span><span>None</span></span><span class="safari no"><span>Safari</span><span>None</span></span><span class="chrome yes"><span>Chrome</span><span>74+</span></span>
+      <span class="firefox no"><span>Firefox</span><span>None</span></span><span class="safari yes"><span>Safari</span><span>16+</span></span><span class="chrome yes"><span>Chrome</span><span>74+</span></span>
       <hr>
-      <span class="opera yes"><span>Opera</span><span>62+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+      <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
       <hr>
-      <span class="edge no"><span>Edge (Legacy)</span><span>None</span></span><span class="ie no"><span>IE</span><span>None</span></span>
+      <span class="edge no"><span>Edge (Legacy)</span><span>?</span></span><span class="ie no"><span>IE</span><span>None</span></span>
       <hr>
-      <span class="firefox_android no"><span>Firefox for Android</span><span>None</span></span><span class="safari_ios no"><span>iOS Safari</span><span>None</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>74+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>53+</span></span>
+      <span class="firefox_android no"><span>Firefox for Android</span><span>?</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android no"><span>Chrome for Android</span><span>?</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android no"><span>Opera Mobile</span><span>?</span></span>
      </div>
     </div>
    </div>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext" id="ref-for-SecureContext②"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed②"><c- g>Exposed</c-></a>=<c- n>Window</c->]
 <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse③"><c- g>AuthenticatorAttestationResponse</c-></a> : <a data-link-type="idl-name" href="#authenticatorresponse" id="ref-for-authenticatorresponse④"><c- n>AuthenticatorResponse</c-></a> {
-    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject④"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①③"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject①"><c- g>attestationObject</c-></a>;
-    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④"><c- b>DOMString</c-></a>>                              <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getTransports()" id="dom-authenticatorattestationresponse-gettransports"><code><c- g>getTransports</c-></code></dfn>();
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①④"><c- b>ArrayBuffer</c-></a>                                      <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getAuthenticatorData()" id="dom-authenticatorattestationresponse-getauthenticatordata"><code><c- g>getAuthenticatorData</c-></code></dfn>();
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑤"><c- b>ArrayBuffer</c-></a>?                                     <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getPublicKey()" id="dom-authenticatorattestationresponse-getpublickey"><code><c- g>getPublicKey</c-></code></dfn>();
+    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject④"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑥"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject①"><c- g>attestationObject</c-></a>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑤"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②①"><c- b>DOMString</c-></a>>                              <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getTransports()" id="dom-authenticatorattestationresponse-gettransports"><code><c- g>getTransports</c-></code></dfn>();
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑦"><c- b>ArrayBuffer</c-></a>                                      <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getAuthenticatorData()" id="dom-authenticatorattestationresponse-getauthenticatordata"><code><c- g>getAuthenticatorData</c-></code></dfn>();
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑧"><c- b>ArrayBuffer</c-></a>?                                     <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getPublicKey()" id="dom-authenticatorattestationresponse-getpublickey"><code><c- g>getPublicKey</c-></code></dfn>();
     <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier②"><c- n>COSEAlgorithmIdentifier</c-></a>                          <dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="method" data-export data-lt="getPublicKeyAlgorithm()" id="dom-authenticatorattestationresponse-getpublickeyalgorithm"><code><c- g>getPublicKeyAlgorithm</c-></code></dfn>();
 };
 </pre>
@@ -2799,22 +2921,22 @@ <h4 class="heading settled" data-level="5.2.1" id="iface-authenticatorattestatio
         <div class="support">
          <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
          <hr>
-         <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+         <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
          <hr>
          <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
          <hr>
-         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
+         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
         </div>
        </div>
       </div>
-      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="attribute" data-export id="dom-authenticatorattestationresponse-attestationobject"><code>attestationObject</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑥">ArrayBuffer</a>, readonly</span></p>
+      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="attribute" data-export id="dom-authenticatorattestationresponse-attestationobject"><code>attestationObject</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑨">ArrayBuffer</a>, readonly</span></p>
      <dd data-md>
       <p>This attribute contains an <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object④">attestation object</a>, which is opaque to, and cryptographically protected against
 tampering by, the client. The <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object⑤">attestation object</a> contains both <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④">authenticator data</a> and an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④">attestation
 statement</a>. The former contains the AAGUID, a unique <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②⓪">credential ID</a>, and the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①②">credential public key</a>. The
-contents of the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑤">attestation statement</a> are determined by the <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format">attestation statement format</a> used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧④">authenticator</a>. It also contains any additional information that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨③">Relying Party</a>'s server requires to validate the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑥">attestation statement</a>, as well as to decode and validate the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑤">authenticator data</a> along with the <a data-link-type="dfn" href="#collectedclientdata-json-compatible-serialization-of-client-data" id="ref-for-collectedclientdata-json-compatible-serialization-of-client-data③">JSON-compatible serialization of client data</a>. For more details, see <a href="#sctn-attestation">§ 6.5 Attestation</a>, <a href="#sctn-generating-an-attestation-object">§ 6.5.4 Generating an Attestation Object</a>,
+contents of the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑤">attestation statement</a> are determined by the <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format">attestation statement format</a> used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧④">authenticator</a>. It also contains any additional information that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨④">Relying Party</a>'s server requires to validate the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑥">attestation statement</a>, as well as to decode and validate the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑤">authenticator data</a> along with the <a data-link-type="dfn" href="#collectedclientdata-json-compatible-serialization-of-client-data" id="ref-for-collectedclientdata-json-compatible-serialization-of-client-data③">JSON-compatible serialization of client data</a>. For more details, see <a href="#sctn-attestation">§ 6.5 Attestation</a>, <a href="#sctn-generating-an-attestation-object">§ 6.5.4 Generating an Attestation Object</a>,
 and <a href="#fig-attStructs">Figure 6</a>.</p>
-     <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports">getTransports()</a></code>
+     <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports①">getTransports()</a></code>
      <dd data-md>
       <p>This operation returns the value of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-transports-slot" id="ref-for-dom-authenticatorattestationresponse-transports-slot①">[[transports]]</a></code>.</p>
      <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getauthenticatordata" id="ref-for-dom-authenticatorattestationresponse-getauthenticatordata">getAuthenticatorData()</a></code>
@@ -2828,13 +2950,13 @@ <h4 class="heading settled" data-level="5.2.1" id="iface-authenticatorattestatio
       <p>This operation returns the <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier③">COSEAlgorithmIdentifier</a></code> of the new credential. See <a href="#sctn-public-key-easy">§ 5.2.1.1 Easily accessing credential data</a>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAttestationResponse" data-dfn-type="attribute" data-export id="dom-authenticatorattestationresponse-transports-slot"><code>[[transports]]</code></dfn>
      <dd data-md>
-      <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots①⑤">internal slot</a> contains a sequence of zero or more unique <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤">DOMString</a></code>s in lexicographical order. These values are the transports that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑤">authenticator</a> is believed to support, or an empty sequence if the information is unavailable. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport①">AuthenticatorTransport</a></code> but <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨④">Relying Parties</a> SHOULD accept and store unknown values.</p>
+      <p>This <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots①⑤">internal slot</a> contains a sequence of zero or more unique <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②②">DOMString</a></code>s in lexicographical order. These values are the transports that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑤">authenticator</a> is believed to support, or an empty sequence if the information is unavailable. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport①">AuthenticatorTransport</a></code> but <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑤">Relying Parties</a> SHOULD accept and store unknown values.</p>
     </dl>
    </div>
    <h5 class="heading settled" data-level="5.2.1.1" id="sctn-public-key-easy"><span class="secno">5.2.1.1. </span><span class="content">Easily accessing credential data</span><a class="self-link" href="#sctn-public-key-easy"></a></h5>
-   <p>Every user of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot②">[[Create]](origin, options, sameOriginWithAncestors)</a></code> method will need to parse and store the returned <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①③">credential public key</a> in order to verify future <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⓪">authentication assertions</a>. However, the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①④">credential public key</a> is in <a data-link-type="biblio" href="#biblio-rfc8152">[RFC8152]</a> (COSE) format, inside the <a data-link-type="dfn" href="#credentialpublickey" id="ref-for-credentialpublickey">credentialPublicKey</a> member of the <a data-link-type="dfn" href="#attestedcredentialdata" id="ref-for-attestedcredentialdata①">attestedCredentialData</a>, inside the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑦">authenticator data</a>, inside the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object⑥">attestation object</a> conveyed by <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse④">AuthenticatorAttestationResponse</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject③">attestationObject</a></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑤">Relying Parties</a> wishing to use <a data-link-type="dfn" href="#attestation" id="ref-for-attestation⑥">attestation</a> are obliged to do the work of parsing the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject④">attestationObject</a></code> and obtaining the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑤">credential public key</a> because that public key copy is the one the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑥">authenticator</a> <a href="#signing-procedure" id="ref-for-signing-procedure">signed</a>. However, many valid WebAuthn use cases do not require <a data-link-type="dfn" href="#attestation" id="ref-for-attestation⑦">attestation</a>. For those uses, user agents can do the work of parsing, expose the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑧">authenticator data</a> directly, and translate the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑥">credential public key</a> into a more convenient format.</p>
-   <p>The <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey①">getPublicKey()</a></code> operation thus returns the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑦">credential public key</a> as a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7①">SubjectPublicKeyInfo</a>. This <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑦">ArrayBuffer</a></code> can, for example, be passed to Java’s <code>java.security.spec.X509EncodedKeySpec</code>, .NET’s <code>System.Security.Cryptography.ECDsa.ImportSubjectPublicKeyInfo</code>, or Go’s <code>crypto/x509.ParsePKIXPublicKey</code>.</p>
-   <p>Use of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey②">getPublicKey()</a></code> does impose some limitations: by using <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-pubkeycredparams" id="ref-for-dom-publickeycredentialcreationoptions-pubkeycredparams②">pubKeyCredParams</a></code>, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑥">Relying Party</a> can negotiate with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑦">authenticator</a> to use public key algorithms that the user agent may not understand. However, if the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑦">Relying Party</a> does so, the user agent will not be able to translate the resulting <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑧">credential public key</a> into <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7②">SubjectPublicKeyInfo</a> format and the return value of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey③">getPublicKey()</a></code> will be null.</p>
+   <p>Every user of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot②">[[Create]](origin, options, sameOriginWithAncestors)</a></code> method will need to parse and store the returned <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①③">credential public key</a> in order to verify future <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⓪">authentication assertions</a>. However, the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①④">credential public key</a> is in <a data-link-type="biblio" href="#biblio-rfc8152">[RFC8152]</a> (COSE) format, inside the <a data-link-type="dfn" href="#credentialpublickey" id="ref-for-credentialpublickey">credentialPublicKey</a> member of the <a data-link-type="dfn" href="#attestedcredentialdata" id="ref-for-attestedcredentialdata①">attestedCredentialData</a>, inside the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑦">authenticator data</a>, inside the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object⑥">attestation object</a> conveyed by <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse④">AuthenticatorAttestationResponse</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject③">attestationObject</a></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑥">Relying Parties</a> wishing to use <a data-link-type="dfn" href="#attestation" id="ref-for-attestation⑥">attestation</a> are obliged to do the work of parsing the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject④">attestationObject</a></code> and obtaining the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑤">credential public key</a> because that public key copy is the one the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑥">authenticator</a> <a href="#signing-procedure" id="ref-for-signing-procedure">signed</a>. However, many valid WebAuthn use cases do not require <a data-link-type="dfn" href="#attestation" id="ref-for-attestation⑦">attestation</a>. For those uses, user agents can do the work of parsing, expose the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑧">authenticator data</a> directly, and translate the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑥">credential public key</a> into a more convenient format.</p>
+   <p>The <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey①">getPublicKey()</a></code> operation thus returns the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑦">credential public key</a> as a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7①">SubjectPublicKeyInfo</a>. This <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②⓪">ArrayBuffer</a></code> can, for example, be passed to Java’s <code>java.security.spec.X509EncodedKeySpec</code>, .NET’s <code>System.Security.Cryptography.ECDsa.ImportSubjectPublicKeyInfo</code>, or Go’s <code>crypto/x509.ParsePKIXPublicKey</code>.</p>
+   <p>Use of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey②">getPublicKey()</a></code> does impose some limitations: by using <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-pubkeycredparams" id="ref-for-dom-publickeycredentialcreationoptions-pubkeycredparams②">pubKeyCredParams</a></code>, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑦">Relying Party</a> can negotiate with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑦">authenticator</a> to use public key algorithms that the user agent may not understand. However, if the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑧">Relying Party</a> does so, the user agent will not be able to translate the resulting <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑧">credential public key</a> into <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7②">SubjectPublicKeyInfo</a> format and the return value of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey③">getPublicKey()</a></code> will be null.</p>
    <p>User agents MUST be able to return a non-null value for <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey④">getPublicKey()</a></code> when the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key①⑨">credential public key</a> has a <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier④">COSEAlgorithmIdentifier</a></code> value of:</p>
    <ul>
     <li data-md>
@@ -2845,8 +2967,8 @@ <h5 class="heading settled" data-level="5.2.1.1" id="sctn-public-key-easy"><span
      <p>-8 (EdDSA), where <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8152#section-13.1.1" id="ref-for-section-13.1.1①">crv</a> is 6 (Ed25519).</p>
    </ul>
    <p>A <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc5280#section-4.1.2.7" id="ref-for-section-4.1.2.7③">SubjectPublicKeyInfo</a> does not include information about the signing algorithm (for example, which hash function to use) that is included in the COSE public key. To provide this, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickeyalgorithm" id="ref-for-dom-authenticatorattestationresponse-getpublickeyalgorithm①">getPublicKeyAlgorithm()</a></code> returns the <code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑤">COSEAlgorithmIdentifier</a></code> for the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⓪">credential public key</a>.</p>
-   <p>To remove the need to parse CBOR at all in many cases, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getauthenticatordata" id="ref-for-dom-authenticatorattestationresponse-getauthenticatordata①">getAuthenticatorData()</a></code> returns the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑨">authenticator data</a> from <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject⑤">attestationObject</a></code>. The <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⓪">authenticator data</a> contains other fields that are encoded in a binary format. However, helper functions are not provided to access them because <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑧">Relying Parties</a> already need to extract those fields when <a href="#sctn-getAssertion">getting an assertion</a>. In contrast to <a href="#sctn-createCredential">credential creation</a>, where signature verification is <a href="#enumdef-attestationconveyancepreference" id="ref-for-enumdef-attestationconveyancepreference">optional</a>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑨">Relying Parties</a> should always be verifying signatures from an assertion and thus must extract fields from the signed <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①①">authenticator data</a>. The same functions used there will also serve during credential creation.</p>
-   <p class="note" role="note"><span>Note:</span> <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey⑤">getPublicKey()</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getauthenticatordata" id="ref-for-dom-authenticatorattestationresponse-getauthenticatordata②">getAuthenticatorData()</a></code> were only added in level two of this spec. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⓪">Relying Parties</a> SHOULD use feature detection before using these functions by testing the value of <code>'getPublicKey' in AuthenticatorAttestationResponse.prototype</code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪①">Relying Parties</a> that require this function to exist may not interoperate with older user-agents.</p>
+   <p>To remove the need to parse CBOR at all in many cases, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getauthenticatordata" id="ref-for-dom-authenticatorattestationresponse-getauthenticatordata①">getAuthenticatorData()</a></code> returns the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data⑨">authenticator data</a> from <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject⑤">attestationObject</a></code>. The <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⓪">authenticator data</a> contains other fields that are encoded in a binary format. However, helper functions are not provided to access them because <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party⑨⑨">Relying Parties</a> already need to extract those fields when <a href="#sctn-getAssertion">getting an assertion</a>. In contrast to <a href="#sctn-createCredential">credential creation</a>, where signature verification is <a href="#enumdef-attestationconveyancepreference" id="ref-for-enumdef-attestationconveyancepreference">optional</a>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⓪">Relying Parties</a> should always be verifying signatures from an assertion and thus must extract fields from the signed <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①①">authenticator data</a>. The same functions used there will also serve during credential creation.</p>
+   <p class="note" role="note"><span>Note:</span> <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getpublickey" id="ref-for-dom-authenticatorattestationresponse-getpublickey⑤">getPublicKey()</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-getauthenticatordata" id="ref-for-dom-authenticatorattestationresponse-getauthenticatordata②">getAuthenticatorData()</a></code> were only added in level two of this spec. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪①">Relying Parties</a> SHOULD use feature detection before using these functions by testing the value of <code>'getPublicKey' in AuthenticatorAttestationResponse.prototype</code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪②">Relying Parties</a> that require this function to exist may not interoperate with older user-agents.</p>
    <h4 class="heading settled" data-level="5.2.2" id="iface-authenticatorassertionresponse"><span class="secno">5.2.2. </span><span class="content">Web Authentication Assertion (interface <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="authenticatorassertionresponse"><code>AuthenticatorAssertionResponse</code></dfn>)</span><a class="self-link" href="#iface-authenticatorassertionresponse"></a></h4>
    <div class="mdn-anno wrapped after">
     <button class="mdn-anno-btn"><b class="all-engines-flag" title="This feature is in all current engines.">✔</b><span>MDN</span></button>
@@ -2856,23 +2978,23 @@ <h4 class="heading settled" data-level="5.2.2" id="iface-authenticatorassertionr
      <div class="support">
       <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
       <hr>
-      <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+      <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
       <hr>
       <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
       <hr>
-      <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
+      <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
      </div>
     </div>
    </div>
    <p>The <code class="idl"><a data-link-type="idl" href="#authenticatorassertionresponse" id="ref-for-authenticatorassertionresponse③">AuthenticatorAssertionResponse</a></code> interface represents an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑧">authenticator</a>'s response to a client’s request for
-generation of a new <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①①">authentication assertion</a> given the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑤">WebAuthn Relying Party</a>'s challenge and OPTIONAL list of credentials it is
+generation of a new <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①①">authentication assertion</a> given the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑦">WebAuthn Relying Party</a>'s challenge and OPTIONAL list of credentials it is
 aware of. This response contains a cryptographic signature proving possession of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key⑧">credential private key</a>, and
 optionally evidence of <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent①①">user consent</a> to a specific transaction.</p>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext" id="ref-for-SecureContext③"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed③"><c- g>Exposed</c-></a>=<c- n>Window</c->]
 <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#authenticatorassertionresponse" id="ref-for-authenticatorassertionresponse④"><c- g>AuthenticatorAssertionResponse</c-></a> : <a data-link-type="idl-name" href="#authenticatorresponse" id="ref-for-authenticatorresponse⑥"><c- n>AuthenticatorResponse</c-></a> {
-    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject⑤"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑧"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorassertionresponse-authenticatordata" id="ref-for-dom-authenticatorassertionresponse-authenticatordata①"><c- g>authenticatorData</c-></a>;
-    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject⑥"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer①⑨"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorassertionresponse-signature" id="ref-for-dom-authenticatorassertionresponse-signature①"><c- g>signature</c-></a>;
-    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject⑦"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②⓪"><c- b>ArrayBuffer</c-></a>?     <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer?" href="#dom-authenticatorassertionresponse-userhandle" id="ref-for-dom-authenticatorassertionresponse-userhandle③"><c- g>userHandle</c-></a>;
+    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject⑤"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②①"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorassertionresponse-authenticatordata" id="ref-for-dom-authenticatorassertionresponse-authenticatordata①"><c- g>authenticatorData</c-></a>;
+    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject⑥"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②②"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorassertionresponse-signature" id="ref-for-dom-authenticatorassertionresponse-signature①"><c- g>signature</c-></a>;
+    [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject" id="ref-for-SameObject⑦"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②③"><c- b>ArrayBuffer</c-></a>?     <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer?" href="#dom-authenticatorassertionresponse-userhandle" id="ref-for-dom-authenticatorassertionresponse-userhandle③"><c- g>userHandle</c-></a>;
 };
 </pre>
    <div>
@@ -2891,15 +3013,15 @@ <h4 class="heading settled" data-level="5.2.2" id="iface-authenticatorassertionr
         <div class="support">
          <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
          <hr>
-         <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+         <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
          <hr>
          <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
          <hr>
-         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
+         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
         </div>
        </div>
       </div>
-      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAssertionResponse" data-dfn-type="attribute" data-export id="dom-authenticatorassertionresponse-authenticatordata"><code>authenticatorData</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②①">ArrayBuffer</a>, readonly</span></p>
+      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAssertionResponse" data-dfn-type="attribute" data-export id="dom-authenticatorassertionresponse-authenticatordata"><code>authenticatorData</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②④">ArrayBuffer</a>, readonly</span></p>
      <dd data-md>
       <p>This attribute contains the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①②">authenticator data</a> returned by the authenticator. See <a href="#sctn-authenticator-data">§ 6.1 Authenticator Data</a>.</p>
      <dt data-md>
@@ -2911,15 +3033,15 @@ <h4 class="heading settled" data-level="5.2.2" id="iface-authenticatorassertionr
         <div class="support">
          <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
          <hr>
-         <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+         <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
          <hr>
          <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
          <hr>
-         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
+         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
         </div>
        </div>
       </div>
-      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAssertionResponse" data-dfn-type="attribute" data-export id="dom-authenticatorassertionresponse-signature"><code>signature</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②②">ArrayBuffer</a>, readonly</span></p>
+      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAssertionResponse" data-dfn-type="attribute" data-export id="dom-authenticatorassertionresponse-signature"><code>signature</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②⑤">ArrayBuffer</a>, readonly</span></p>
      <dd data-md>
       <p>This attribute contains the raw signature returned from the authenticator. See <a href="#sctn-op-get-assertion">§ 6.3.3 The authenticatorGetAssertion Operation</a>.</p>
      <dt data-md>
@@ -2931,31 +3053,31 @@ <h4 class="heading settled" data-level="5.2.2" id="iface-authenticatorassertionr
         <div class="support">
          <span class="firefox yes"><span>Firefox</span><span>60+</span></span><span class="safari yes"><span>Safari</span><span>13+</span></span><span class="chrome yes"><span>Chrome</span><span>67+</span></span>
          <hr>
-         <span class="opera yes"><span>Opera</span><span>54+</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
+         <span class="opera no"><span>Opera</span><span>?</span></span><span class="edge_blink yes"><span>Edge</span><span>79+</span></span>
          <hr>
          <span class="edge yes"><span>Edge (Legacy)</span><span>18</span></span><span class="ie no"><span>IE</span><span>None</span></span>
          <hr>
-         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios yes"><span>iOS Safari</span><span>13+</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>None</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
+         <span class="firefox_android yes"><span>Firefox for Android</span><span>92+</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>70+</span></span><span class="webview_android no"><span>Android WebView</span><span>None</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android yes"><span>Opera Mobile</span><span>48+</span></span>
         </div>
        </div>
       </div>
-      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAssertionResponse" data-dfn-type="attribute" data-export id="dom-authenticatorassertionresponse-userhandle"><code>userHandle</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②③">ArrayBuffer</a>, readonly, nullable</span></p>
+      <p><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorAssertionResponse" data-dfn-type="attribute" data-export id="dom-authenticatorassertionresponse-userhandle"><code>userHandle</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②⑥">ArrayBuffer</a>, readonly, nullable</span></p>
      <dd data-md>
       <p>This attribute contains the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle⑨">user handle</a> returned from the authenticator, or null if the authenticator did not return a <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle①⓪">user handle</a>. See <a href="#sctn-op-get-assertion">§ 6.3.3 The authenticatorGetAssertion Operation</a>.</p>
     </dl>
    </div>
    <h3 class="heading settled" data-level="5.3" id="dictionary-credential-params"><span class="secno">5.3. </span><span class="content">Parameters for Credential Generation (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialparameters"><code>PublicKeyCredentialParameters</code></dfn>)</span><a class="self-link" href="#dictionary-credential-params"></a></h3>
-<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters"><c- g>PublicKeyCredentialParameters</c-></a> {
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑥"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString                    " href="#dom-publickeycredentialparameters-type" id="ref-for-dom-publickeycredentialparameters-type②"><c- g>type</c-></a>;
+<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters①"><c- g>PublicKeyCredentialParameters</c-></a> {
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②③"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString                    " href="#dom-publickeycredentialparameters-type" id="ref-for-dom-publickeycredentialparameters-type②"><c- g>type</c-></a>;
     <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑥"><c- n>COSEAlgorithmIdentifier</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="COSEAlgorithmIdentifier      " href="#dom-publickeycredentialparameters-alg" id="ref-for-dom-publickeycredentialparameters-alg①"><c- g>alg</c-></a>;
 };
 </pre>
    <div>
      This dictionary is used to supply additional parameters when creating a new credential. 
     <dl>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialParameters" data-dfn-type="dict-member" data-export id="dom-publickeycredentialparameters-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑦">DOMString</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialParameters" data-dfn-type="dict-member" data-export id="dom-publickeycredentialparameters-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②④">DOMString</a></span>
      <dd data-md>
-      <p>This member specifies the type of credential to be created. The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype④">PublicKeyCredentialType</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑧">client platforms</a> MUST ignore unknown values, ignoring any <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters①">PublicKeyCredentialParameters</a></code> with an unknown <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialparameters-type" id="ref-for-dom-publickeycredentialparameters-type③">type</a></code>.</p>
+      <p>This member specifies the type of credential to be created. The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype④">PublicKeyCredentialType</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑧">client platforms</a> MUST ignore unknown values, ignoring any <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters②">PublicKeyCredentialParameters</a></code> with an unknown <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialparameters-type" id="ref-for-dom-publickeycredentialparameters-type③">type</a></code>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialParameters" data-dfn-type="dict-member" data-export id="dom-publickeycredentialparameters-alg"><code>alg</code></dfn>, <span> of type <a data-link-type="idl-name" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier⑦">COSEAlgorithmIdentifier</a></span>
      <dd data-md>
       <p>This member specifies the cryptographic signature algorithm with which the newly generated credential will be used, and
@@ -2965,25 +3087,25 @@ <h3 class="heading settled" data-level="5.3" id="dictionary-credential-params"><
         a message to the authenticator, which may be sent over a low-bandwidth link.</p>
    </div>
    <h3 class="heading settled" data-level="5.4" id="dictionary-makecredentialoptions"><span class="secno">5.4. </span><span class="content">Options for Credential Creation (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialcreationoptions"><code>PublicKeyCredentialCreationOptions</code></dfn>)</span><a class="self-link" href="#dictionary-makecredentialoptions"></a></h3>
-<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions②"><c- g>PublicKeyCredentialCreationOptions</c-></a> {
-    <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity"><c- n>PublicKeyCredentialRpEntity</c-></a>         <a class="idl-code" data-link-type="dict-member" data-type="PublicKeyCredentialRpEntity         " href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑧"><c- g>rp</c-></a>;
+<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑥"><c- g>PublicKeyCredentialCreationOptions</c-></a> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity①"><c- n>PublicKeyCredentialRpEntity</c-></a>         <a class="idl-code" data-link-type="dict-member" data-type="PublicKeyCredentialRpEntity         " href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑧"><c- g>rp</c-></a>;
     <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity"><c- n>PublicKeyCredentialUserEntity</c-></a>       <a class="idl-code" data-link-type="dict-member" data-type="PublicKeyCredentialUserEntity       " href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user③"><c- g>user</c-></a>;
 
     <c- b>required</c-> <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource②"><c- n>BufferSource</c-></a>                             <a class="idl-code" data-link-type="dict-member" data-type="BufferSource                             " href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge①"><c- g>challenge</c-></a>;
-    <c- b>required</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters②"><c- n>PublicKeyCredentialParameters</c-></a>>  <a class="idl-code" data-link-type="dict-member" data-type="sequence<PublicKeyCredentialParameters>  " href="#dom-publickeycredentialcreationoptions-pubkeycredparams" id="ref-for-dom-publickeycredentialcreationoptions-pubkeycredparams③"><c- g>pubKeyCredParams</c-></a>;
+    <c- b>required</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑥"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters③"><c- n>PublicKeyCredentialParameters</c-></a>>  <a class="idl-code" data-link-type="dict-member" data-type="sequence<PublicKeyCredentialParameters>  " href="#dom-publickeycredentialcreationoptions-pubkeycredparams" id="ref-for-dom-publickeycredentialcreationoptions-pubkeycredparams③"><c- g>pubKeyCredParams</c-></a>;
 
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long"><c- b>unsigned</c-> <c- b>long</c-></a>                                <a class="idl-code" data-link-type="dict-member" data-type="unsigned long                                " href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout③"><c- g>timeout</c-></a>;
-    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence②"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor③"><c- n>PublicKeyCredentialDescriptor</c-></a>>      <a class="idl-code" data-default="[]" data-link-type="dict-member" data-type="sequence<PublicKeyCredentialDescriptor>      " href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials①"><c- g>excludeCredentials</c-></a> = [];
-    <a data-link-type="idl-name" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria"><c- n>AuthenticatorSelectionCriteria</c-></a>               <a class="idl-code" data-link-type="dict-member" data-type="AuthenticatorSelectionCriteria               " href="#dom-publickeycredentialcreationoptions-authenticatorselection" id="ref-for-dom-publickeycredentialcreationoptions-authenticatorselection⑨"><c- g>authenticatorSelection</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑧"><c- b>DOMString</c-></a>                                    <a class="idl-code" data-default="&quot;none&quot;" data-link-type="dict-member" data-type="DOMString                                    " href="#dom-publickeycredentialcreationoptions-attestation" id="ref-for-dom-publickeycredentialcreationoptions-attestation②"><c- g>attestation</c-></a> = "none";
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②"><c- b>unsigned</c-> <c- b>long</c-></a>                                <a class="idl-code" data-link-type="dict-member" data-type="unsigned long                                " href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout③"><c- g>timeout</c-></a>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑦"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor③"><c- n>PublicKeyCredentialDescriptor</c-></a>>      <a class="idl-code" data-default="[]" data-link-type="dict-member" data-type="sequence<PublicKeyCredentialDescriptor>      " href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials①"><c- g>excludeCredentials</c-></a> = [];
+    <a data-link-type="idl-name" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria①"><c- n>AuthenticatorSelectionCriteria</c-></a>               <a class="idl-code" data-link-type="dict-member" data-type="AuthenticatorSelectionCriteria               " href="#dom-publickeycredentialcreationoptions-authenticatorselection" id="ref-for-dom-publickeycredentialcreationoptions-authenticatorselection⑨"><c- g>authenticatorSelection</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑤"><c- b>DOMString</c-></a>                                    <a class="idl-code" data-default="&quot;none&quot;" data-link-type="dict-member" data-type="DOMString                                    " href="#dom-publickeycredentialcreationoptions-attestation" id="ref-for-dom-publickeycredentialcreationoptions-attestation②"><c- g>attestation</c-></a> = "none";
     <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs"><c- n>AuthenticationExtensionsClientInputs</c-></a>         <a class="idl-code" data-link-type="dict-member" data-type="AuthenticationExtensionsClientInputs         " href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions③"><c- g>extensions</c-></a>;
 };
 </pre>
    <div>
     <dl>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-rp"><code>rp</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity①">PublicKeyCredentialRpEntity</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-rp"><code>rp</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity②">PublicKeyCredentialRpEntity</a></span>
      <dd data-md>
-      <p>This member contains a name and an identifier for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪②">Relying Party</a> responsible for the request.</p>
+      <p>This member contains a name and an identifier for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪③">Relying Party</a> responsible for the request.</p>
       <p>Its value’s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name">name</a></code> member is REQUIRED. See <a href="#dictionary-pkcredentialentity">§ 5.4.1 Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> for further
 details.</p>
       <p>Its value’s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑦">id</a></code> member specifies the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②①">RP ID</a> the credential
@@ -2993,43 +3115,43 @@ <h3 class="heading settled" data-level="5.4" id="dictionary-makecredentialoption
      <dd data-md>
       <p>This member contains names and an identifier for the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①①">user account</a> performing the <a data-link-type="dfn" href="#registration" id="ref-for-registration①④">registration</a>.</p>
       <p>Its value’s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①">name</a></code>, <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname①">displayName</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id②">id</a></code> members are REQUIRED. <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id③">id</a></code> can be returned as the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorassertionresponse-userhandle" id="ref-for-dom-authenticatorassertionresponse-userhandle④">userHandle</a></code> in some future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony⑧">authentication ceremonies</a>,
-and is used to overwrite existing <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential④">discoverable credentials</a> that have the same <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑨">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑧">id</a></code></code> and <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user④">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id④">id</a></code></code> on the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑨">authenticator</a>. <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name②">name</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname②">displayName</a></code> MAY be used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⓪">authenticator</a> and <a data-link-type="dfn" href="#client" id="ref-for-client②⑤">client</a> in future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony⑨">authentication ceremonies</a> to help the user select a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential⑧">credential</a>, but are not returned to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪③">Relying Party</a> as a result of future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⓪">authentication ceremonies</a></p>
+and is used to overwrite existing <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential④">discoverable credentials</a> that have the same <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-rp" id="ref-for-dom-publickeycredentialcreationoptions-rp⑨">rp</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑧">id</a></code></code> and <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user④">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id④">id</a></code></code> on the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑧⑨">authenticator</a>. <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name②">name</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname②">displayName</a></code> MAY be used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⓪">authenticator</a> and <a data-link-type="dfn" href="#client" id="ref-for-client③②">client</a> in future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony⑨">authentication ceremonies</a> to help the user select a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential⑧">credential</a>, but are not returned to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪④">Relying Party</a> as a result of future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⓪">authentication ceremonies</a></p>
       <p>For further details, see <a href="#dictionary-pkcredentialentity">§ 5.4.1 Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> and <a href="#dictionary-user-credential-params">§ 5.4.3 User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)</a>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-challenge"><code>challenge</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource③">BufferSource</a></span>
      <dd data-md>
       <p>This member specifies a challenge that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨①">authenticator</a> signs, along with other data,
 when producing an <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object⑦">attestation object</a> for the newly created credential.
 See the <a href="#sctn-cryptographic-challenges">§ 13.4.3 Cryptographic Challenges</a> security consideration.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-pubkeycredparams"><code>pubKeyCredParams</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters③">PublicKeyCredentialParameters</a>></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-pubkeycredparams"><code>pubKeyCredParams</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialparameters" id="ref-for-dictdef-publickeycredentialparameters④">PublicKeyCredentialParameters</a>></span>
      <dd data-md>
-      <p>This member lists the key types and signature algorithms the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪④">Relying Party</a> supports,
+      <p>This member lists the key types and signature algorithms the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑤">Relying Party</a> supports,
 ordered from most preferred to least preferred.
-The <a data-link-type="dfn" href="#client" id="ref-for-client②⑥">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨②">authenticator</a> make a best-effort to create a credential of the most preferred type possible.
-If none of the listed types can be created, the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①③">create()</a></code> operation fails.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-timeout"><code>timeout</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①">unsigned long</a></span>
+The <a data-link-type="dfn" href="#client" id="ref-for-client③③">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨②">authenticator</a> make a best-effort to create a credential of the most preferred type possible.
+If none of the listed types can be created, the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①④">create()</a></code> operation fails.</p>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-timeout"><code>timeout</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long③">unsigned long</a></span>
      <dd data-md>
-      <p>This OPTIONAL member specifies a time, in milliseconds, that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑤">Relying Party</a> is willing to wait for the call to complete. This is
-treated as a hint, and MAY be overridden by the <a data-link-type="dfn" href="#client" id="ref-for-client②⑦">client</a>.</p>
+      <p>This OPTIONAL member specifies a time, in milliseconds, that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑥">Relying Party</a> is willing to wait for the call to complete. This is
+treated as a hint, and MAY be overridden by the <a data-link-type="dfn" href="#client" id="ref-for-client③④">client</a>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-excludecredentials"><code>excludeCredentials</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor④">PublicKeyCredentialDescriptor</a>>, defaulting to <code>[]</code></span>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑥">Relying Party</a> SHOULD use this OPTIONAL member to list any existing <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential⑨">credentials</a> mapped to this <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①②">user account</a> (as identified by <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑤">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id⑤">id</a></code>).
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑦">Relying Party</a> SHOULD use this OPTIONAL member to list any existing <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential⑨">credentials</a> mapped to this <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①②">user account</a> (as identified by <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑤">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id⑤">id</a></code>).
 This ensures that the new credential is not <a data-link-type="dfn" href="#created-on" id="ref-for-created-on①">created on</a> an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨③">authenticator</a> that already <a data-link-type="dfn" href="#contains" id="ref-for-contains①">contains</a> a credential mapped to this <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①③">user account</a>.
-If it would be, the <a data-link-type="dfn" href="#client" id="ref-for-client②⑧">client</a> is requested to instead guide the user to use a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨④">authenticator</a>,
+If it would be, the <a data-link-type="dfn" href="#client" id="ref-for-client③⑤">client</a> is requested to instead guide the user to use a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨④">authenticator</a>,
 or return an error if that fails.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-authenticatorselection"><code>authenticatorSelection</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria①">AuthenticatorSelectionCriteria</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-authenticatorselection"><code>authenticatorSelection</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria②">AuthenticatorSelectionCriteria</a></span>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑦">Relying Party</a> MAY use this OPTIONAL member to specify capabilities and settings
-that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑤">authenticator</a> MUST or SHOULD satisfy to participate in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①④">create()</a></code> operation.
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑧">Relying Party</a> MAY use this OPTIONAL member to specify capabilities and settings
+that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑤">authenticator</a> MUST or SHOULD satisfy to participate in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑤">create()</a></code> operation.
 See <a href="#dictionary-authenticatorSelection">§ 5.4.4 Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a>.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-attestation"><code>attestation</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑨">DOMString</a>, defaulting to <code>"none"</code></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-attestation"><code>attestation</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑥">DOMString</a>, defaulting to <code>"none"</code></span>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑧">Relying Party</a> MAY use this OPTIONAL member to specify a preference regarding <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance①">attestation conveyance</a>.
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑨">Relying Party</a> MAY use this OPTIONAL member to specify a preference regarding <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance①">attestation conveyance</a>.
 Its value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-attestationconveyancepreference" id="ref-for-enumdef-attestationconveyancepreference④">AttestationConveyancePreference</a></code>. <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform②⑨">Client platforms</a> MUST ignore unknown values, treating an unknown value as if the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists">member does not exist</a>.</p>
       <p>The default value is <code class="idl"><a data-link-type="idl" href="#dom-attestationconveyancepreference-none" id="ref-for-dom-attestationconveyancepreference-none①">none</a></code>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialCreationOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialcreationoptions-extensions"><code>extensions</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs①">AuthenticationExtensionsClientInputs</a></span>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⓪⑨">Relying Party</a> MAY use this OPTIONAL member to provide <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input">client extension inputs</a> requesting additional processing by the <a data-link-type="dfn" href="#client" id="ref-for-client②⑨">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑥">authenticator</a>.
-For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⓪">Relying Party</a> may request that the client returns additional information about the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⓪">credential</a> that was created.</p>
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⓪">Relying Party</a> MAY use this OPTIONAL member to provide <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input②">client extension inputs</a> requesting additional processing by the <a data-link-type="dfn" href="#client" id="ref-for-client③⑥">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑥">authenticator</a>.
+For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①①">Relying Party</a> may request that the client returns additional information about the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⓪">credential</a> that was created.</p>
       <p>The extensions framework is defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.
 Some extensions are defined in <a href="#sctn-defined-extensions">§ 10 Defined Extensions</a>;
 consult the IANA "WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries">[IANA-WebAuthn-Registries]</a> established by <a data-link-type="biblio" href="#biblio-rfc8809">[RFC8809]</a> for an up-to-date list
@@ -3037,29 +3159,29 @@ <h3 class="heading settled" data-level="5.4" id="dictionary-makecredentialoption
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.4.1" id="dictionary-pkcredentialentity"><span class="secno">5.4.1. </span><span class="content">Public Key Entity Description (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialentity"><code>PublicKeyCredentialEntity</code></dfn>)</span><a class="self-link" href="#dictionary-pkcredentialentity"></a></h4>
-   <p>The <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialentity" id="ref-for-dictdef-publickeycredentialentity">PublicKeyCredentialEntity</a></code> dictionary describes a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①④">user account</a>, or a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑥">WebAuthn Relying Party</a>, which a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③①">public key credential</a> is
+   <p>The <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialentity" id="ref-for-dictdef-publickeycredentialentity">PublicKeyCredentialEntity</a></code> dictionary describes a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①④">user account</a>, or a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑧">WebAuthn Relying Party</a>, which a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③①">public key credential</a> is
 associated with or <a data-link-type="dfn" href="#scope" id="ref-for-scope①①">scoped</a> to, respectively.</p>
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialentity" id="ref-for-dictdef-publickeycredentialentity①"><c- g>PublicKeyCredentialEntity</c-></a> {
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⓪"><c- b>DOMString</c-></a>    <a class="idl-code" data-link-type="dict-member" data-type="DOMString    " href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name③"><c- g>name</c-></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑦"><c- b>DOMString</c-></a>    <a class="idl-code" data-link-type="dict-member" data-type="DOMString    " href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name③"><c- g>name</c-></a>;
 };
 </pre>
    <div>
     <dl>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialEntity" data-dfn-type="dict-member" data-export id="dom-publickeycredentialentity-name"><code>name</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①①">DOMString</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialEntity" data-dfn-type="dict-member" data-export id="dom-publickeycredentialentity-name"><code>name</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑧">DOMString</a></span>
      <dd data-md>
       <p>A <a data-link-type="dfn" href="#human-palatability" id="ref-for-human-palatability①">human-palatable</a> name for the entity. Its function depends on what the <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialentity" id="ref-for-dictdef-publickeycredentialentity②">PublicKeyCredentialEntity</a></code> represents:</p>
       <ul>
        <li data-md>
-        <p>When inherited by <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity②">PublicKeyCredentialRpEntity</a></code> it is a <a data-link-type="dfn" href="#human-palatability" id="ref-for-human-palatability②">human-palatable</a> identifier for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①①">Relying Party</a>, intended only
+        <p>When inherited by <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity③">PublicKeyCredentialRpEntity</a></code> it is a <a data-link-type="dfn" href="#human-palatability" id="ref-for-human-palatability②">human-palatable</a> identifier for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①②">Relying Party</a>, intended only
 for display. For example, "ACME Corporation", "Wonderful Widgets, Inc." or "ОАО Примертех".</p>
         <ul>
          <li data-md>
-          <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①②">Relying Parties</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
+          <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①③">Relying Parties</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
 when setting <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name④">name</a></code>'s value, or displaying the value to the user.</p>
          <li data-md>
-          <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①③">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
+          <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①④">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
          <li data-md>
-          <p><a data-link-type="dfn" href="#client" id="ref-for-client③⓪">Clients</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
+          <p><a data-link-type="dfn" href="#client" id="ref-for-client③⑦">Clients</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
 on <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑤">name</a></code>'s value prior to displaying the value to the user or
 including the value as a parameter of the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential⑦">authenticatorMakeCredential</a> operation.</p>
         </ul>
@@ -3069,33 +3191,33 @@ <h4 class="heading settled" data-level="5.4.1" id="dictionary-pkcredentialentity
 or "+14255551234".</p>
         <ul>
          <li data-md>
-          <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①④">Relying Party</a> MAY let the user choose this value. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑤">Relying Party</a> SHOULD perform enforcement,
+          <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑤">Relying Party</a> MAY let the user choose this value. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑥">Relying Party</a> SHOULD perform enforcement,
 as prescribed in Section 3.4.3 of <a data-link-type="biblio" href="#biblio-rfc8265">[RFC8265]</a> for the UsernameCasePreserved Profile of the PRECIS
 IdentifierClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>, when setting <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑥">name</a></code>'s value, or displaying the value
 to the user.</p>
          <li data-md>
-          <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑥">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
+          <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑦">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
          <li data-md>
-          <p><a data-link-type="dfn" href="#client" id="ref-for-client③①">Clients</a> SHOULD perform enforcement, as prescribed in Section 3.4.3 of <a data-link-type="biblio" href="#biblio-rfc8265">[RFC8265]</a> for the UsernameCasePreserved Profile of the PRECIS IdentifierClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
+          <p><a data-link-type="dfn" href="#client" id="ref-for-client③⑧">Clients</a> SHOULD perform enforcement, as prescribed in Section 3.4.3 of <a data-link-type="biblio" href="#biblio-rfc8265">[RFC8265]</a> for the UsernameCasePreserved Profile of the PRECIS IdentifierClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
 on <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑦">name</a></code>'s value prior to displaying the value to the user or
 including the value as a parameter of the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential⑧">authenticatorMakeCredential</a> operation.</p>
         </ul>
       </ul>
-      <p>When <a data-link-type="dfn" href="#client" id="ref-for-client③②">clients</a>, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⓪">client platforms</a>, or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑦">authenticators</a> display a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑧">name</a></code>'s value, they should always use UI elements to provide a clear boundary around the displayed value, and not allow overflow into other elements <a data-link-type="biblio" href="#biblio-css-overflow-3">[css-overflow-3]</a>.</p>
+      <p>When <a data-link-type="dfn" href="#client" id="ref-for-client③⑨">clients</a>, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⓪">client platforms</a>, or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑦">authenticators</a> display a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑧">name</a></code>'s value, they should always use UI elements to provide a clear boundary around the displayed value, and not allow overflow into other elements <a data-link-type="biblio" href="#biblio-css-overflow-3">[css-overflow-3]</a>.</p>
       <p>Authenticators MAY truncate a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name⑨">name</a></code> member’s value so that it fits within 64 bytes, if the authenticator stores the value. See <a href="#sctn-strings-truncation">§ 6.4.1 String Truncation</a> about truncation and other considerations.</p>
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.4.2" id="dictionary-rp-credential-params"><span class="secno">5.4.2. </span><span class="content">Relying Party Parameters for Credential Generation (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialrpentity"><code>PublicKeyCredentialRpEntity</code></dfn>)</span><a class="self-link" href="#dictionary-rp-credential-params"></a></h4>
-   <p>The <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity③">PublicKeyCredentialRpEntity</a></code> dictionary is used to supply additional <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑦">Relying Party</a> attributes when creating a new credential.</p>
-<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity④"><c- g>PublicKeyCredentialRpEntity</c-></a> : <a data-link-type="idl-name" href="#dictdef-publickeycredentialentity" id="ref-for-dictdef-publickeycredentialentity③"><c- n>PublicKeyCredentialEntity</c-></a> {
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①②"><c- b>DOMString</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="DOMString      " href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑨"><c- g>id</c-></a>;
+   <p>The <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity④">PublicKeyCredentialRpEntity</a></code> dictionary is used to supply additional <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑧">Relying Party</a> attributes when creating a new credential.</p>
+<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity⑤"><c- g>PublicKeyCredentialRpEntity</c-></a> : <a data-link-type="idl-name" href="#dictdef-publickeycredentialentity" id="ref-for-dictdef-publickeycredentialentity③"><c- n>PublicKeyCredentialEntity</c-></a> {
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑨"><c- b>DOMString</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="DOMString      " href="#dom-publickeycredentialrpentity-id" id="ref-for-dom-publickeycredentialrpentity-id⑨"><c- g>id</c-></a>;
 };
 </pre>
    <div>
     <dl>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRpEntity" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrpentity-id"><code>id</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①③">DOMString</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRpEntity" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrpentity-id"><code>id</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⓪">DOMString</a></span>
      <dd data-md>
-      <p>A unique identifier for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑧">Relying Party</a> entity, which sets the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②②">RP ID</a>.</p>
+      <p>A unique identifier for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑨">Relying Party</a> entity, which sets the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②②">RP ID</a>.</p>
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.4.3" id="dictionary-user-credential-params"><span class="secno">5.4.3. </span><span class="content">User Account Parameters for Credential Generation (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialuserentity"><code>PublicKeyCredentialUserEntity</code></dfn>)</span><a class="self-link" href="#dictionary-user-credential-params"></a></h4>
@@ -3103,7 +3225,7 @@ <h4 class="heading settled" data-level="5.4.3" id="dictionary-user-credential-pa
 credential.</p>
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity④"><c- g>PublicKeyCredentialUserEntity</c-></a> : <a data-link-type="idl-name" href="#dictdef-publickeycredentialentity" id="ref-for-dictdef-publickeycredentialentity④"><c- n>PublicKeyCredentialEntity</c-></a> {
     <c- b>required</c-> <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource④"><c- n>BufferSource</c-></a>   <a class="idl-code" data-link-type="dict-member" data-type="BufferSource   " href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id⑥"><c- g>id</c-></a>;
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①④"><c- b>DOMString</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="DOMString      " href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname④"><c- g>displayName</c-></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③①"><c- b>DOMString</c-></a>      <a class="idl-code" data-link-type="dict-member" data-type="DOMString      " href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname④"><c- g>displayName</c-></a>;
 };
 </pre>
    <div>
@@ -3120,62 +3242,62 @@ <h4 class="heading settled" data-level="5.4.3" id="dictionary-user-credential-pa
       <p class="note" role="note"><span>Note:</span> the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle①⑤">user handle</a> <i>ought not</i> be a constant value across different <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①⑧">user accounts</a>,
 even for <a data-link-type="dfn" href="#non-discoverable-credential" id="ref-for-non-discoverable-credential②">non-discoverable credentials</a>, because some authenticators always create <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑤">discoverable credentials</a>.
 Thus a constant <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle①⑥">user handle</a> would prevent a user from using such an authenticator
-with more than one <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①⑨">user account</a> at the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①①⑨">Relying Party</a>.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialUserEntity" data-dfn-type="dict-member" data-export id="dom-publickeycredentialuserentity-displayname"><code>displayName</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑤">DOMString</a></span>
+with more than one <a data-link-type="dfn" href="#user-account" id="ref-for-user-account①⑨">user account</a> at the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⓪">Relying Party</a>.</p>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialUserEntity" data-dfn-type="dict-member" data-export id="dom-publickeycredentialuserentity-displayname"><code>displayName</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③②">DOMString</a></span>
      <dd data-md>
-      <p>A <a data-link-type="dfn" href="#human-palatability" id="ref-for-human-palatability④">human-palatable</a> name for the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⓪">user account</a>, intended only for display. For example, "Alex Müller" or "田中倫". The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⓪">Relying Party</a> SHOULD let the user choose this, and SHOULD NOT restrict the choice more than necessary.</p>
+      <p>A <a data-link-type="dfn" href="#human-palatability" id="ref-for-human-palatability④">human-palatable</a> name for the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⓪">user account</a>, intended only for display. For example, "Alex Müller" or "田中倫". The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②①">Relying Party</a> SHOULD let the user choose this, and SHOULD NOT restrict the choice more than necessary.</p>
       <ul>
        <li data-md>
-        <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②①">Relying Parties</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
+        <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②②">Relying Parties</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
 when setting <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑥">displayName</a></code>'s value, or displaying the value to the user.</p>
        <li data-md>
-        <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②②">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
+        <p>This string MAY contain language and direction metadata. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②③">Relying Parties</a> SHOULD consider providing this information. See <a href="#sctn-strings-langdir">§ 6.4.2 Language and Direction Encoding</a> about how this metadata is encoded.</p>
        <li data-md>
-        <p><a data-link-type="dfn" href="#client" id="ref-for-client③③">Clients</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
+        <p><a data-link-type="dfn" href="#client" id="ref-for-client④⓪">Clients</a> SHOULD perform enforcement, as prescribed in Section 2.3 of <a data-link-type="biblio" href="#biblio-rfc8266">[RFC8266]</a> for the Nickname Profile of the PRECIS FreeformClass <a data-link-type="biblio" href="#biblio-rfc8264">[RFC8264]</a>,
 on <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑦">displayName</a></code>'s value prior to displaying the value to the user or
 including the value as a parameter of the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential⑨">authenticatorMakeCredential</a> operation.</p>
       </ul>
-      <p>When <a data-link-type="dfn" href="#client" id="ref-for-client③④">clients</a>, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③①">client platforms</a>, or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑧">authenticators</a> display a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑧">displayName</a></code>'s value, they should always use UI elements to provide a clear boundary around the displayed value, and not allow overflow into other elements <a data-link-type="biblio" href="#biblio-css-overflow-3">[css-overflow-3]</a>.</p>
+      <p>When <a data-link-type="dfn" href="#client" id="ref-for-client④①">clients</a>, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③①">client platforms</a>, or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑧">authenticators</a> display a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑧">displayName</a></code>'s value, they should always use UI elements to provide a clear boundary around the displayed value, and not allow overflow into other elements <a data-link-type="biblio" href="#biblio-css-overflow-3">[css-overflow-3]</a>.</p>
       <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator⑨⑨">Authenticators</a> MUST accept and store a 64-byte minimum length for a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname⑨">displayName</a></code> member’s value. Authenticators MAY truncate a <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname①⓪">displayName</a></code> member’s value so that it fits within 64 bytes. See <a href="#sctn-strings-truncation">§ 6.4.1 String Truncation</a> about truncation and other considerations.</p>
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.4.4" id="dictionary-authenticatorSelection"><span class="secno">5.4.4. </span><span class="content">Authenticator Selection Criteria (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticatorselectioncriteria"><code>AuthenticatorSelectionCriteria</code></dfn>)</span><a class="self-link" href="#dictionary-authenticatorSelection"></a></h4>
-   <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑦">WebAuthn Relying Parties</a> may use the <code class="idl"><a data-link-type="idl" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria②">AuthenticatorSelectionCriteria</a></code> dictionary to specify their requirements regarding authenticator
+   <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑨">WebAuthn Relying Parties</a> may use the <code class="idl"><a data-link-type="idl" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria③">AuthenticatorSelectionCriteria</a></code> dictionary to specify their requirements regarding authenticator
 attributes.</p>
-<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria③"><c- g>AuthenticatorSelectionCriteria</c-></a> {
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑥"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString                    " href="#dom-authenticatorselectioncriteria-authenticatorattachment" id="ref-for-dom-authenticatorselectioncriteria-authenticatorattachment①"><c- g>authenticatorAttachment</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑦"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString                    " href="#dom-authenticatorselectioncriteria-residentkey" id="ref-for-dom-authenticatorselectioncriteria-residentkey②"><c- g>residentKey</c-></a>;
+<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticatorselectioncriteria" id="ref-for-dictdef-authenticatorselectioncriteria④"><c- g>AuthenticatorSelectionCriteria</c-></a> {
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③③"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString                    " href="#dom-authenticatorselectioncriteria-authenticatorattachment" id="ref-for-dom-authenticatorselectioncriteria-authenticatorattachment①"><c- g>authenticatorAttachment</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③④"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString                    " href="#dom-authenticatorselectioncriteria-residentkey" id="ref-for-dom-authenticatorselectioncriteria-residentkey②"><c- g>residentKey</c-></a>;
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①"><c- b>boolean</c-></a>                      <a class="idl-code" data-default="false" data-link-type="dict-member" data-type="boolean                      " href="#dom-authenticatorselectioncriteria-requireresidentkey" id="ref-for-dom-authenticatorselectioncriteria-requireresidentkey②"><c- g>requireResidentKey</c-></a> = <c- b>false</c->;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑧"><c- b>DOMString</c-></a>                    <a class="idl-code" data-default="&quot;preferred&quot;" data-link-type="dict-member" data-type="DOMString                    " href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification③"><c- g>userVerification</c-></a> = "preferred";
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑤"><c- b>DOMString</c-></a>                    <a class="idl-code" data-default="&quot;preferred&quot;" data-link-type="dict-member" data-type="DOMString                    " href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification③"><c- g>userVerification</c-></a> = "preferred";
 };
 </pre>
    <div>
     <dl>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorSelectionCriteria" data-dfn-type="dict-member" data-export id="dom-authenticatorselectioncriteria-authenticatorattachment"><code>authenticatorAttachment</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑨">DOMString</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorSelectionCriteria" data-dfn-type="dict-member" data-export id="dom-authenticatorselectioncriteria-authenticatorattachment"><code>authenticatorAttachment</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑥">DOMString</a></span>
      <dd data-md>
       <p>If this member is present, eligible <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⓪">authenticators</a> are filtered to be only those authenticators attached with the specified <a href="#enum-attachment">authenticator attachment modality</a> (see also <a href="#sctn-authenticator-attachment-modality">§ 6.2.1 Authenticator Attachment Modality</a>).
 If this member is absent, then any attachment modality is acceptable.
 The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatorattachment" id="ref-for-enumdef-authenticatorattachment③">AuthenticatorAttachment</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③②">client platforms</a> MUST ignore unknown values,
 treating an unknown value as if the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①">member does not exist</a>.</p>
-      <p>See also the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-authenticatorattachment" id="ref-for-dom-publickeycredential-authenticatorattachment④">authenticatorAttachment</a></code> member of <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⑤">PublicKeyCredential</a></code>,
+      <p>See also the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-authenticatorattachment" id="ref-for-dom-publickeycredential-authenticatorattachment④">authenticatorAttachment</a></code> member of <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⑧">PublicKeyCredential</a></code>,
 which can tell what <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑤">authenticator attachment modality</a> was used
-in a successful <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑤">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⓪">get()</a></code> operation.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorSelectionCriteria" data-dfn-type="dict-member" data-export id="dom-authenticatorselectioncriteria-residentkey"><code>residentKey</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⓪">DOMString</a></span>
+in a successful <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑥">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②①">get()</a></code> operation.</p>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorSelectionCriteria" data-dfn-type="dict-member" data-export id="dom-authenticatorselectioncriteria-residentkey"><code>residentKey</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑦">DOMString</a></span>
      <dd data-md>
-      <p>Specifies the extent to which the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②③">Relying Party</a> desires to create a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑥">client-side discoverable credential</a>. For historical reasons the naming retains the deprecated “resident” terminology. The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-residentkeyrequirement" id="ref-for-enumdef-residentkeyrequirement">ResidentKeyRequirement</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③③">client platforms</a> MUST ignore unknown values, treating an unknown value as if the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists②">member does not exist</a>. If no value is given then the effective value is <code class="idl"><a data-link-type="idl" href="#dom-residentkeyrequirement-required" id="ref-for-dom-residentkeyrequirement-required②">required</a></code> if <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-requireresidentkey" id="ref-for-dom-authenticatorselectioncriteria-requireresidentkey③">requireResidentKey</a></code> is <code>true</code> or <code class="idl"><a data-link-type="idl" href="#dom-residentkeyrequirement-discouraged" id="ref-for-dom-residentkeyrequirement-discouraged②">discouraged</a></code> if it is <code>false</code> or absent.</p>
+      <p>Specifies the extent to which the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②④">Relying Party</a> desires to create a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑥">client-side discoverable credential</a>. For historical reasons the naming retains the deprecated “resident” terminology. The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-residentkeyrequirement" id="ref-for-enumdef-residentkeyrequirement">ResidentKeyRequirement</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③③">client platforms</a> MUST ignore unknown values, treating an unknown value as if the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists②">member does not exist</a>. If no value is given then the effective value is <code class="idl"><a data-link-type="idl" href="#dom-residentkeyrequirement-required" id="ref-for-dom-residentkeyrequirement-required②">required</a></code> if <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-requireresidentkey" id="ref-for-dom-authenticatorselectioncriteria-requireresidentkey③">requireResidentKey</a></code> is <code>true</code> or <code class="idl"><a data-link-type="idl" href="#dom-residentkeyrequirement-discouraged" id="ref-for-dom-residentkeyrequirement-discouraged②">discouraged</a></code> if it is <code>false</code> or absent.</p>
       <p>See <code class="idl"><a data-link-type="idl" href="#enumdef-residentkeyrequirement" id="ref-for-enumdef-residentkeyrequirement①">ResidentKeyRequirement</a></code> for the description of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-residentkey" id="ref-for-dom-authenticatorselectioncriteria-residentkey③">residentKey</a></code>'s values and semantics.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorSelectionCriteria" data-dfn-type="dict-member" data-export id="dom-authenticatorselectioncriteria-requireresidentkey"><code>requireResidentKey</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②">boolean</a>, defaulting to <code>false</code></span>
      <dd data-md>
-      <p>This member is retained for backwards compatibility with WebAuthn Level 1 and, for historical reasons, its naming retains the deprecated “resident” terminology for <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑥">discoverable credentials</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②④">Relying Parties</a> SHOULD set it to <code>true</code> if, and only if, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-residentkey" id="ref-for-dom-authenticatorselectioncriteria-residentkey④">residentKey</a></code> is set to <code class="idl"><a data-link-type="idl" href="#dom-residentkeyrequirement-required" id="ref-for-dom-residentkeyrequirement-required③">required</a></code>.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorSelectionCriteria" data-dfn-type="dict-member" data-export id="dom-authenticatorselectioncriteria-userverification"><code>userVerification</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②①">DOMString</a>, defaulting to <code>"preferred"</code></span>
+      <p>This member is retained for backwards compatibility with WebAuthn Level 1 and, for historical reasons, its naming retains the deprecated “resident” terminology for <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑥">discoverable credentials</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑤">Relying Parties</a> SHOULD set it to <code>true</code> if, and only if, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-residentkey" id="ref-for-dom-authenticatorselectioncriteria-residentkey④">residentKey</a></code> is set to <code class="idl"><a data-link-type="idl" href="#dom-residentkeyrequirement-required" id="ref-for-dom-residentkeyrequirement-required③">required</a></code>.</p>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorSelectionCriteria" data-dfn-type="dict-member" data-export id="dom-authenticatorselectioncriteria-userverification"><code>userVerification</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑧">DOMString</a>, defaulting to <code>"preferred"</code></span>
      <dd data-md>
-      <p>This member specifies the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑤">Relying Party</a>'s requirements regarding <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification①⑧">user verification</a> for the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑥">create()</a></code> operation.
+      <p>This member specifies the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑥">Relying Party</a>'s requirements regarding <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification①⑧">user verification</a> for the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑦">create()</a></code> operation.
 The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-userverificationrequirement" id="ref-for-enumdef-userverificationrequirement">UserVerificationRequirement</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③④">client platforms</a> MUST ignore unknown values, treating an unknown value as if the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists③">member does not exist</a>.</p>
       <p>See <code class="idl"><a data-link-type="idl" href="#enumdef-userverificationrequirement" id="ref-for-enumdef-userverificationrequirement①">UserVerificationRequirement</a></code> for the description of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification④">userVerification</a></code>'s values and semantics.</p>
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.4.5" id="enum-attachment"><span class="secno">5.4.5. </span><span class="content">Authenticator Attachment Enumeration (enum <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-authenticatorattachment"><code>AuthenticatorAttachment</code></dfn>)</span><a class="self-link" href="#enum-attachment"></a></h4>
-   <p>This enumeration’s values describe <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪①">authenticators</a>' <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑥">attachment modalities</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑥">Relying Parties</a> use this to express a preferred <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑦">authenticator attachment modality</a> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑦">navigator.credentials.create()</a></code> to <a href="#sctn-createCredential">create a credential</a>, and <a data-link-type="dfn" href="#client" id="ref-for-client③⑤">clients</a> use this to report the <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑧">authenticator attachment modality</a> used to complete a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony④">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①①">authentication ceremony</a>.</p>
+   <p>This enumeration’s values describe <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪①">authenticators</a>' <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑥">attachment modalities</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑦">Relying Parties</a> use this to express a preferred <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑦">authenticator attachment modality</a> when calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑧">navigator.credentials.create()</a></code> to <a href="#sctn-createCredential">create a credential</a>, and <a data-link-type="dfn" href="#client" id="ref-for-client④②">clients</a> use this to report the <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑧">authenticator attachment modality</a> used to complete a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony④">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①①">authentication ceremony</a>.</p>
 <pre class="idl highlight def"><c- b>enum</c-> <a class="idl-code" data-link-type="enum" href="#enumdef-authenticatorattachment" id="ref-for-enumdef-authenticatorattachment④"><c- g>AuthenticatorAttachment</c-></a> {
     <a class="idl-code" data-link-type="enum-value" href="#dom-authenticatorattachment-platform" id="ref-for-dom-authenticatorattachment-platform"><c- s>"platform"</c-></a>,
     <a class="idl-code" data-link-type="enum-value" href="#dom-authenticatorattachment-cross-platform" id="ref-for-dom-authenticatorattachment-cross-platform"><c- s>"cross-platform"</c-></a>
@@ -3193,9 +3315,9 @@ <h4 class="heading settled" data-level="5.4.5" id="enum-attachment"><span class=
     </dl>
    </div>
    <p class="note" role="note"><span>Note:</span> An <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality⑨">authenticator attachment modality</a> selection option is available only in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot③">[[Create]](origin, options,
-sameOriginWithAncestors)</a></code> operation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑦">Relying Party</a> may use it to, for example, ensure the user has a <a data-link-type="dfn" href="#roaming-credential" id="ref-for-roaming-credential">roaming credential</a> for
+sameOriginWithAncestors)</a></code> operation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑧">Relying Party</a> may use it to, for example, ensure the user has a <a data-link-type="dfn" href="#roaming-credential" id="ref-for-roaming-credential">roaming credential</a> for
 authenticating on another <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①⑥">client device</a>; or to specifically register a <a data-link-type="dfn" href="#platform-credential" id="ref-for-platform-credential">platform credential</a> for easier reauthentication using a
-particular <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①⑦">client device</a>. The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot③">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> operation has no <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality①⓪">authenticator attachment modality</a> selection option, so the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑧">Relying Party</a> SHOULD accept any of the user’s registered <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③②">credentials</a>. The <a data-link-type="dfn" href="#client" id="ref-for-client③⑥">client</a> and user will then use whichever is available and convenient at the time.</p>
+particular <a data-link-type="dfn" href="#client-device" id="ref-for-client-device①⑦">client device</a>. The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot③">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> operation has no <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality①⓪">authenticator attachment modality</a> selection option, so the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑨">Relying Party</a> SHOULD accept any of the user’s registered <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③②">credentials</a>. The <a data-link-type="dfn" href="#client" id="ref-for-client④③">client</a> and user will then use whichever is available and convenient at the time.</p>
    <h4 class="heading settled" data-level="5.4.6" id="enum-residentKeyRequirement"><span class="secno">5.4.6. </span><span class="content">Resident Key Requirement Enumeration (enum <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-residentkeyrequirement"><code>ResidentKeyRequirement</code></dfn>)</span><a class="self-link" href="#enum-residentKeyRequirement"></a></h4>
 <pre class="idl highlight def"><c- b>enum</c-> <a class="idl-code" data-link-type="enum" href="#enumdef-residentkeyrequirement" id="ref-for-enumdef-residentkeyrequirement②"><c- g>ResidentKeyRequirement</c-></a> {
     <a class="idl-code" data-link-type="enum-value" href="#dom-residentkeyrequirement-discouraged" id="ref-for-dom-residentkeyrequirement-discouraged③"><c- s>"discouraged"</c-></a>,
@@ -3204,29 +3326,29 @@ <h4 class="heading settled" data-level="5.4.6" id="enum-residentKeyRequirement">
 };
 </pre>
    <p class="note" role="note"><span>Note:</span> The <code class="idl"><a data-link-type="idl" href="#enumdef-residentkeyrequirement" id="ref-for-enumdef-residentkeyrequirement③">ResidentKeyRequirement</a></code> enumeration is deliberately not referenced, see <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.</p>
-   <p>This enumeration’s values describe the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①②⑨">Relying Party</a>'s requirements for <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑦">client-side discoverable credentials</a> (formerly known as <a data-link-type="dfn" href="#resident-credential" id="ref-for-resident-credential①">resident credentials</a> or <a data-link-type="dfn" href="#resident-key" id="ref-for-resident-key②">resident keys</a>):</p>
+   <p>This enumeration’s values describe the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⓪">Relying Party</a>'s requirements for <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑦">client-side discoverable credentials</a> (formerly known as <a data-link-type="dfn" href="#resident-credential" id="ref-for-resident-credential①">resident credentials</a> or <a data-link-type="dfn" href="#resident-key" id="ref-for-resident-key②">resident keys</a>):</p>
    <div>
     <dl>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ResidentKeyRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;discouraged&quot;|discouraged" id="dom-residentkeyrequirement-discouraged"><code>discouraged</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⓪">Relying Party</a> prefers creating a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑥">server-side credential</a>, but will accept a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑧">client-side discoverable credential</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client③⑦">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪②">authenticator</a> SHOULD create a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑦">server-side credential</a> if possible.</p>
-      <p class="note" role="note"><span>Note:</span> A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③①">Relying Party</a> cannot require that a created credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑧">server-side credential</a> and the <a data-link-type="dfn" href="#credprops" id="ref-for-credprops①">Credential Properties Extension</a> may not return a value for the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk">rk</a></code> property. Because of this, it may be the case that it does not know if a credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑨">server-side credential</a> or not and thus does not know whether creating a second credential with the same <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle①⑦">user handle</a> will evict the first.</p>
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③①">Relying Party</a> prefers creating a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑥">server-side credential</a>, but will accept a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑧">client-side discoverable credential</a>.
+The <a data-link-type="dfn" href="#client" id="ref-for-client④④">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪②">authenticator</a> SHOULD create a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑦">server-side credential</a> if possible.</p>
+      <p class="note" role="note"><span>Note:</span> A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③②">Relying Party</a> cannot require that a created credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑧">server-side credential</a> and the <a data-link-type="dfn" href="#credprops" id="ref-for-credprops①">Credential Properties Extension</a> may not return a value for the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk">rk</a></code> property. Because of this, it may be the case that it does not know if a credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential⑨">server-side credential</a> or not and thus does not know whether creating a second credential with the same <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle①⑦">user handle</a> will evict the first.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ResidentKeyRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;preferred&quot;|preferred" id="dom-residentkeyrequirement-preferred"><code>preferred</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③②">Relying Party</a> strongly prefers creating a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑨">client-side discoverable credential</a>, but will accept a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①⓪">server-side credential</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client③⑧">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪③">authenticator</a> SHOULD create a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑦">discoverable credential</a> if possible.
-For example, the <a data-link-type="dfn" href="#client" id="ref-for-client③⑨">client</a> SHOULD guide the user through setting up <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification①⑨">user verification</a> if needed to create a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑧">discoverable credential</a>. This takes precedence over the setting of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification⑤">userVerification</a></code>.</p>
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③③">Relying Party</a> strongly prefers creating a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential⑨">client-side discoverable credential</a>, but will accept a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①⓪">server-side credential</a>.
+The <a data-link-type="dfn" href="#client" id="ref-for-client④⑤">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪③">authenticator</a> SHOULD create a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑦">discoverable credential</a> if possible.
+For example, the <a data-link-type="dfn" href="#client" id="ref-for-client④⑥">client</a> SHOULD guide the user through setting up <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification①⑨">user verification</a> if needed to create a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑧">discoverable credential</a>. This takes precedence over the setting of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification⑤">userVerification</a></code>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="ResidentKeyRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;required&quot;|required" id="dom-residentkeyrequirement-required"><code>required</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③③">Relying Party</a> requires a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①⓪">client-side discoverable credential</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client④⓪">client</a> MUST return an error if a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①①">client-side discoverable credential</a> cannot be created.</p>
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③④">Relying Party</a> requires a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①⓪">client-side discoverable credential</a>.
+The <a data-link-type="dfn" href="#client" id="ref-for-client④⑦">client</a> MUST return an error if a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①①">client-side discoverable credential</a> cannot be created.</p>
     </dl>
    </div>
-   <p class="note" role="note"><span>Note:</span> The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③④">Relying Party</a> can seek information on whether or not the authenticator created a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①②">client-side discoverable credential</a> using the <a data-link-type="dfn" href="#credentialpropertiesoutput-resident-key-credential-property" id="ref-for-credentialpropertiesoutput-resident-key-credential-property">resident key credential property</a> of the <a data-link-type="dfn" href="#credprops" id="ref-for-credprops②">Credential Properties Extension</a>.
+   <p class="note" role="note"><span>Note:</span> The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑤">Relying Party</a> can seek information on whether or not the authenticator created a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①②">client-side discoverable credential</a> using the <a data-link-type="dfn" href="#credentialpropertiesoutput-resident-key-credential-property" id="ref-for-credentialpropertiesoutput-resident-key-credential-property">resident key credential property</a> of the <a data-link-type="dfn" href="#credprops" id="ref-for-credprops②">Credential Properties Extension</a>.
 This is useful when values of <code class="idl"><a data-link-type="idl" href="#dom-residentkeyrequirement-discouraged" id="ref-for-dom-residentkeyrequirement-discouraged④">discouraged</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-residentkeyrequirement-preferred" id="ref-for-dom-residentkeyrequirement-preferred③">preferred</a></code> are used for <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-authenticatorselection" id="ref-for-dom-publickeycredentialcreationoptions-authenticatorselection①⓪">authenticatorSelection</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-residentkey" id="ref-for-dom-authenticatorselectioncriteria-residentkey⑤">residentKey</a></code></code>, because in those cases it is possible for an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪④">authenticator</a> to create <em>either</em> a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①③">client-side discoverable credential</a> or a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①①">server-side credential</a>.</p>
    <h4 class="heading settled" data-level="5.4.7" id="enum-attestation-convey"><span class="secno">5.4.7. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attestation-conveyance">Attestation Conveyance</dfn> Preference Enumeration (enum <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-attestationconveyancepreference"><code>AttestationConveyancePreference</code></dfn>)</span><a class="self-link" href="#enum-attestation-convey"></a></h4>
-   <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑧">WebAuthn Relying Parties</a> may use <code class="idl"><a data-link-type="idl" href="#enumdef-attestationconveyancepreference" id="ref-for-enumdef-attestationconveyancepreference①">AttestationConveyancePreference</a></code> to specify their preference regarding <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance②">attestation conveyance</a> during credential generation.</p>
+   <p><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⓪">WebAuthn Relying Parties</a> may use <code class="idl"><a data-link-type="idl" href="#enumdef-attestationconveyancepreference" id="ref-for-enumdef-attestationconveyancepreference①">AttestationConveyancePreference</a></code> to specify their preference regarding <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance②">attestation conveyance</a> during credential generation.</p>
 <pre class="idl highlight def"><c- b>enum</c-> <a class="idl-code" data-link-type="enum" href="#enumdef-attestationconveyancepreference" id="ref-for-enumdef-attestationconveyancepreference②"><c- g>AttestationConveyancePreference</c-></a> {
     <a class="idl-code" data-link-type="enum-value" href="#dom-attestationconveyancepreference-none" id="ref-for-dom-attestationconveyancepreference-none②"><c- s>"none"</c-></a>,
     <a class="idl-code" data-link-type="enum-value" href="#dom-attestationconveyancepreference-indirect" id="ref-for-dom-attestationconveyancepreference-indirect①"><c- s>"indirect"</c-></a>,
@@ -3239,38 +3361,38 @@ <h4 class="heading settled" data-level="5.4.7" id="enum-attestation-convey"><spa
     <dl>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AttestationConveyancePreference" data-dfn-type="enum-value" data-export data-lt="&quot;none&quot;|none" id="dom-attestationconveyancepreference-none"><code>none</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑤">Relying Party</a> is not interested in <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑤">authenticator</a> <a data-link-type="dfn" href="#attestation" id="ref-for-attestation⑧">attestation</a>. For example, in order to
-potentially avoid having to obtain <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent①②">user consent</a> to relay identifying information to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑥">Relying Party</a>, or to save a
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑥">Relying Party</a> is not interested in <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑤">authenticator</a> <a data-link-type="dfn" href="#attestation" id="ref-for-attestation⑧">attestation</a>. For example, in order to
+potentially avoid having to obtain <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent①②">user consent</a> to relay identifying information to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑦">Relying Party</a>, or to save a
 roundtrip to an <a data-link-type="dfn" href="#attestation-ca" id="ref-for-attestation-ca">Attestation CA</a> or <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca①">Anonymization CA</a>.
 If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑥">authenticator</a> generates an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑦">attestation statement</a> that is not a <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑤">self attestation</a>,
-the <a data-link-type="dfn" href="#client" id="ref-for-client④①">client</a> will replace it with a <a data-link-type="dfn" href="#none" id="ref-for-none">None</a> attestation statement.</p>
+the <a data-link-type="dfn" href="#client" id="ref-for-client④⑧">client</a> will replace it with a <a data-link-type="dfn" href="#none" id="ref-for-none">None</a> attestation statement.</p>
       <p>This is the default, and unknown values fall back to the behavior of this value.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AttestationConveyancePreference" data-dfn-type="enum-value" data-export data-lt="&quot;indirect&quot;|indirect" id="dom-attestationconveyancepreference-indirect"><code>indirect</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑦">Relying Party</a> wants to receive a verifiable <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑧">attestation statement</a>,
-but allows the <a data-link-type="dfn" href="#client" id="ref-for-client④②">client</a> to decide how to obtain such an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑨">attestation statement</a>.
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑧">Relying Party</a> wants to receive a verifiable <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑧">attestation statement</a>,
+but allows the <a data-link-type="dfn" href="#client" id="ref-for-client④⑨">client</a> to decide how to obtain such an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement⑨">attestation statement</a>.
 The client MAY replace an authenticator-generated <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⓪">attestation statement</a> with one generated by an <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca②">Anonymization CA</a>,
-in order to protect the user’s privacy, or to assist <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑧">Relying Parties</a> with attestation verification in a heterogeneous ecosystem.</p>
-      <p class="note" role="note"><span>Note:</span> There is no guarantee that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑨">Relying Party</a> will obtain a verifiable <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①①">attestation statement</a> in this case.
-For example, in the case that the authenticator employs <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑥">self attestation</a> and the <a data-link-type="dfn" href="#client" id="ref-for-client④③">client</a> passes the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①②">attestation statement</a> through unmodified.</p>
+in order to protect the user’s privacy, or to assist <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①③⑨">Relying Parties</a> with attestation verification in a heterogeneous ecosystem.</p>
+      <p class="note" role="note"><span>Note:</span> There is no guarantee that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⓪">Relying Party</a> will obtain a verifiable <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①①">attestation statement</a> in this case.
+For example, in the case that the authenticator employs <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑥">self attestation</a> and the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⓪">client</a> passes the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①②">attestation statement</a> through unmodified.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AttestationConveyancePreference" data-dfn-type="enum-value" data-export data-lt="&quot;direct&quot;|direct" id="dom-attestationconveyancepreference-direct"><code>direct</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⓪">Relying Party</a> wants to receive the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①③">attestation statement</a> as generated by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑦">authenticator</a>.</p>
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④①">Relying Party</a> wants to receive the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①③">attestation statement</a> as generated by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑦">authenticator</a>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AttestationConveyancePreference" data-dfn-type="enum-value" data-export data-lt="&quot;enterprise&quot;|enterprise" id="dom-attestationconveyancepreference-enterprise"><code>enterprise</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④①">Relying Party</a> wants to receive an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①④">attestation statement</a> that may include uniquely identifying information. This is intended for controlled deployments within an enterprise where the organization wishes to tie registrations to specific authenticators. User agents MUST NOT provide such an attestation unless the user agent or authenticator configuration permits it for the requested <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②③">RP ID</a>.</p>
-      <p>If permitted, the user agent SHOULD signal to the authenticator (at <a href="#CreateCred-InvokeAuthnrMakeCred">invocation time</a>) that enterprise attestation is requested, and convey the resulting <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid⑤">AAGUID</a> and <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑤">attestation statement</a>, unaltered, to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④②">Relying Party</a>.</p>
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④②">Relying Party</a> wants to receive an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①④">attestation statement</a> that may include uniquely identifying information. This is intended for controlled deployments within an enterprise where the organization wishes to tie registrations to specific authenticators. User agents MUST NOT provide such an attestation unless the user agent or authenticator configuration permits it for the requested <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②③">RP ID</a>.</p>
+      <p>If permitted, the user agent SHOULD signal to the authenticator (at <a href="#CreateCred-InvokeAuthnrMakeCred">invocation time</a>) that enterprise attestation is requested, and convey the resulting <a data-link-type="dfn" href="#aaguid" id="ref-for-aaguid⑤">AAGUID</a> and <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑤">attestation statement</a>, unaltered, to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④③">Relying Party</a>.</p>
     </dl>
    </div>
    <h3 class="heading settled" data-level="5.5" id="dictionary-assertion-options"><span class="secno">5.5. </span><span class="content">Options for Assertion Generation (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialrequestoptions"><code>PublicKeyCredentialRequestOptions</code></dfn>)</span><a class="self-link" href="#dictionary-assertion-options"></a></h3>
-   <p>The <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions②">PublicKeyCredentialRequestOptions</a></code> dictionary supplies <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②①">get()</a></code> with the data it needs to generate
+   <p>The <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑥">PublicKeyCredentialRequestOptions</a></code> dictionary supplies <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②②">get()</a></code> with the data it needs to generate
 an assertion. Its <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge①">challenge</a></code> member MUST be present, while its other members are OPTIONAL.</p>
-<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions③"><c- g>PublicKeyCredentialRequestOptions</c-></a> {
+<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑦"><c- g>PublicKeyCredentialRequestOptions</c-></a> {
     <c- b>required</c-> <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource⑥"><c- n>BufferSource</c-></a>                <a class="idl-code" data-link-type="dict-member" data-type="BufferSource                " href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge②"><c- g>challenge</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②"><c- b>unsigned</c-> <c- b>long</c-></a>                        <a class="idl-code" data-link-type="dict-member" data-type="unsigned long                        " href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout③"><c- g>timeout</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long④"><c- b>unsigned</c-> <c- b>long</c-></a>                        <a class="idl-code" data-link-type="dict-member" data-type="unsigned long                        " href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout③"><c- g>timeout</c-></a>;
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString"><c- b>USVString</c-></a>                            <a class="idl-code" data-link-type="dict-member" data-type="USVString                            " href="#dom-publickeycredentialrequestoptions-rpid" id="ref-for-dom-publickeycredentialrequestoptions-rpid④"><c- g>rpId</c-></a>;
-    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence③"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑤"><c- n>PublicKeyCredentialDescriptor</c-></a>> <a class="idl-code" data-default="[]" data-link-type="dict-member" data-type="sequence<PublicKeyCredentialDescriptor> " href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①①"><c- g>allowCredentials</c-></a> = [];
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②②"><c- b>DOMString</c-></a>                            <a class="idl-code" data-default="&quot;preferred&quot;" data-link-type="dict-member" data-type="DOMString                            " href="#dom-publickeycredentialrequestoptions-userverification" id="ref-for-dom-publickeycredentialrequestoptions-userverification③"><c- g>userVerification</c-></a> = "preferred";
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑧"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑤"><c- n>PublicKeyCredentialDescriptor</c-></a>> <a class="idl-code" data-default="[]" data-link-type="dict-member" data-type="sequence<PublicKeyCredentialDescriptor> " href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①①"><c- g>allowCredentials</c-></a> = [];
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑨"><c- b>DOMString</c-></a>                            <a class="idl-code" data-default="&quot;preferred&quot;" data-link-type="dict-member" data-type="DOMString                            " href="#dom-publickeycredentialrequestoptions-userverification" id="ref-for-dom-publickeycredentialrequestoptions-userverification③"><c- g>userVerification</c-></a> = "preferred";
     <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs②"><c- n>AuthenticationExtensionsClientInputs</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="AuthenticationExtensionsClientInputs " href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions③"><c- g>extensions</c-></a>;
 };
 </pre>
@@ -3278,51 +3400,51 @@ <h3 class="heading settled" data-level="5.5" id="dictionary-assertion-options"><
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-challenge"><code>challenge</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource⑦">BufferSource</a></span>
     <dd data-md>
      <p>This member specifies a challenge that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑧">authenticator</a> signs, along with other data, when producing an <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①②">authentication assertion</a>. See the <a href="#sctn-cryptographic-challenges">§ 13.4.3 Cryptographic Challenges</a> security consideration.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-timeout"><code>timeout</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long③">unsigned long</a></span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-timeout"><code>timeout</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤">unsigned long</a></span>
     <dd data-md>
-     <p>This OPTIONAL member specifies a time, in milliseconds, that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④③">Relying Party</a> is willing to wait for the call to complete.
-The value is treated as a hint, and MAY be overridden by the <a data-link-type="dfn" href="#client" id="ref-for-client④④">client</a>.</p>
+     <p>This OPTIONAL member specifies a time, in milliseconds, that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④④">Relying Party</a> is willing to wait for the call to complete.
+The value is treated as a hint, and MAY be overridden by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤①">client</a>.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-rpid"><code>rpId</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString①">USVString</a></span>
     <dd data-md>
-     <p>This OPTIONAL member specifies the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②④">RP ID</a> claimed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④④">Relying Party</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client④⑤">client</a> MUST verify that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑤">Relying Party</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①①">origin</a> matches the <a data-link-type="dfn" href="#scope" id="ref-for-scope①②">scope</a> of this <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑤">RP ID</a>.
+     <p>This OPTIONAL member specifies the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②④">RP ID</a> claimed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑤">Relying Party</a>.
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑤②">client</a> MUST verify that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑥">Relying Party</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①①">origin</a> matches the <a data-link-type="dfn" href="#scope" id="ref-for-scope①②">scope</a> of this <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑤">RP ID</a>.
 The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⓪⑨">authenticator</a> MUST verify
 that this <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑥">RP ID</a> exactly equals the <a data-link-type="dfn" href="#public-key-credential-source-rpid" id="ref-for-public-key-credential-source-rpid">rpId</a> of the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①①">credential</a> to be used for the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①②">authentication ceremony</a>.</p>
      <p>If not specified, its value will
 be the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credentialscontainer" id="ref-for-credentialscontainer②">CredentialsContainer</a></code> object’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#relevant-settings-object" id="ref-for-relevant-settings-object④">relevant settings object</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-settings-object-origin" id="ref-for-concept-settings-object-origin⑦">origin</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin-effective-domain" id="ref-for-concept-origin-effective-domain①③">effective domain</a>.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-allowcredentials"><code>allowCredentials</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑥">PublicKeyCredentialDescriptor</a>>, defaulting to <code>[]</code></span>
     <dd data-md>
-     <p>This OPTIONAL member is used by the <a data-link-type="dfn" href="#client" id="ref-for-client④⑥">client</a> to find <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⓪">authenticators</a> eligible for this <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①③">authentication ceremony</a>.
+     <p>This OPTIONAL member is used by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤③">client</a> to find <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⓪">authenticators</a> eligible for this <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①③">authentication ceremony</a>.
 It can be used in two ways:</p>
      <ul>
       <li data-md>
        <p>If the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②①">user account</a> to authenticate is already identified (e.g., if the user has entered a username),
-then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑥">Relying Party</a> SHOULD use this member to list the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①②">credentials</a> <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑤">registered</a> to the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②②">user account</a>.
+then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑦">Relying Party</a> SHOULD use this member to list the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①②">credentials</a> <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑤">registered</a> to the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②②">user account</a>.
 This SHOULD usually include all of the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②③">user account’s</a> credentials.</p>
-       <p>The <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑥">items</a> SHOULD specify <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑧">transports</a></code> whenever possible.
-This helps the <a data-link-type="dfn" href="#client" id="ref-for-client④⑦">client</a> optimize the user experience for any given situation.
-Also note that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑦">Relying Party</a> does not need to filter the list when requesting <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⓪">user verification</a> —
-the <a data-link-type="dfn" href="#client" id="ref-for-client④⑧">client</a> will automatically ignore non-eligible credentials
+       <p>The <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑥">items</a> SHOULD specify <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports③">transports</a></code> whenever possible.
+This helps the <a data-link-type="dfn" href="#client" id="ref-for-client⑤④">client</a> optimize the user experience for any given situation.
+Also note that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑧">Relying Party</a> does not need to filter the list when requesting <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⓪">user verification</a> —
+the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑤">client</a> will automatically ignore non-eligible credentials
 if <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-userverification" id="ref-for-dom-publickeycredentialrequestoptions-userverification④">userVerification</a></code> is set to <code class="idl"><a data-link-type="idl" href="#dom-userverificationrequirement-required" id="ref-for-dom-userverificationrequirement-required⑥">required</a></code>.</p>
        <p>See also the <a href="#sctn-credential-id-privacy-leak">§ 14.6.3 Privacy leak via credential IDs</a> privacy consideration.</p>
       <li data-md>
        <p>If the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②④">user account</a> to authenticate is not already identified,
-then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑧">Relying Party</a> MAY leave this member <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①">empty</a> or unspecified.
+then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑨">Relying Party</a> MAY leave this member <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①">empty</a> or unspecified.
 In this case, only <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential⑨">discoverable credentials</a> will be utilized in this <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①④">authentication ceremony</a>,
 and the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑤">user account</a> MAY be identified by the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorassertionresponse-userhandle" id="ref-for-dom-authenticatorassertionresponse-userhandle⑤">userHandle</a></code> of the resulting <code class="idl"><a data-link-type="idl" href="#authenticatorassertionresponse" id="ref-for-authenticatorassertionresponse⑤">AuthenticatorAssertionResponse</a></code>.
-If the available <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①①">authenticators</a> <a data-link-type="dfn" href="#contains" id="ref-for-contains②">contain</a> more than one <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⓪">discoverable credential</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope①③">scoped</a> to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①④⑨">Relying Party</a>,
+If the available <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①①">authenticators</a> <a data-link-type="dfn" href="#contains" id="ref-for-contains②">contain</a> more than one <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⓪">discoverable credential</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope①③">scoped</a> to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⓪">Relying Party</a>,
 the credentials are displayed by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⑤">client platform</a> or <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①②">authenticator</a> for the user to select from (see step 7 of <a href="#sctn-op-get-assertion">§ 6.3.3 The authenticatorGetAssertion Operation</a>).</p>
      </ul>
      <p>If not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty②">empty</a>, the client MUST return an error if none of the listed credentials can be used.</p>
      <p>The list is ordered in descending order of preference: the first item in the list is the most
 preferred credential, and the last is the least preferred.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-userverification"><code>userVerification</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②③">DOMString</a>, defaulting to <code>"preferred"</code></span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-userverification"><code>userVerification</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④⓪">DOMString</a>, defaulting to <code>"preferred"</code></span>
     <dd data-md>
-     <p>This OPTIONAL member specifies the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⓪">Relying Party</a>'s requirements regarding <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②①">user verification</a> for the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②②">get()</a></code> operation. The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-userverificationrequirement" id="ref-for-enumdef-userverificationrequirement②">UserVerificationRequirement</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⑥">client platforms</a> MUST ignore unknown values, treating an unknown value as if the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists④">member does not exist</a>. Eligible authenticators are filtered to only those capable of satisfying this requirement.</p>
+     <p>This OPTIONAL member specifies the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤①">Relying Party</a>'s requirements regarding <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②①">user verification</a> for the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②③">get()</a></code> operation. The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-userverificationrequirement" id="ref-for-enumdef-userverificationrequirement②">UserVerificationRequirement</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⑥">client platforms</a> MUST ignore unknown values, treating an unknown value as if the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists④">member does not exist</a>. Eligible authenticators are filtered to only those capable of satisfying this requirement.</p>
      <p>See <code class="idl"><a data-link-type="idl" href="#enumdef-userverificationrequirement" id="ref-for-enumdef-userverificationrequirement③">UserVerificationRequirement</a></code> for the description of <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-userverification" id="ref-for-dom-authenticatorselectioncriteria-userverification⑥">userVerification</a></code>'s values and semantics.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialRequestOptions" data-dfn-type="dict-member" data-export id="dom-publickeycredentialrequestoptions-extensions"><code>extensions</code></dfn>, <span> of type <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs③">AuthenticationExtensionsClientInputs</a></span>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤①">Relying Party</a> MAY use this OPTIONAL member to provide <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①">client extension inputs</a> requesting additional processing by the <a data-link-type="dfn" href="#client" id="ref-for-client④⑨">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①③">authenticator</a>.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤②">Relying Party</a> MAY use this OPTIONAL member to provide <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input③">client extension inputs</a> requesting additional processing by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑥">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①③">authenticator</a>.</p>
      <p>The extensions framework is defined in <a href="#sctn-extensions">§ 9 WebAuthn Extensions</a>.
 Some extensions are defined in <a href="#sctn-defined-extensions">§ 10 Defined Extensions</a>;
 consult the IANA "WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries">[IANA-WebAuthn-Registries]</a> established by <a data-link-type="biblio" href="#biblio-rfc8809">[RFC8809]</a> for an up-to-date list
@@ -3350,7 +3472,7 @@ <h4 class="heading settled" data-level="5.7.1" id="iface-authentication-extensio
 <pre class="idl highlight def"><c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationextensionsclientinputs"><code><c- g>AuthenticationExtensionsClientInputs</c-></code></dfn> {
 };
 </pre>
-   <p>This is a dictionary containing the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input②">client extension input</a> values for zero or more <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions③">WebAuthn Extensions</a>.</p>
+   <p>This is a dictionary containing the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input④">client extension input</a> values for zero or more <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions③">WebAuthn Extensions</a>.</p>
    <h4 class="heading settled" data-level="5.7.2" id="iface-authentication-extensions-client-outputs"><span class="secno">5.7.2. </span><span class="content">Authentication Extensions Client Outputs (dictionary <code class="idl"><a data-link-type="idl" href="#dictdef-authenticationextensionsclientoutputs" id="ref-for-dictdef-authenticationextensionsclientoutputs④">AuthenticationExtensionsClientOutputs</a></code>)</span><a class="self-link" href="#iface-authentication-extensions-client-outputs"></a></h4>
 <pre class="idl highlight def"><c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationextensionsclientoutputs"><code><c- g>AuthenticationExtensionsClientOutputs</c-></code></dfn> {
 };
@@ -3364,7 +3486,7 @@ <h4 class="heading settled" data-level="5.7.3" id="iface-authentication-extensio
    <p>The <a data-link-type="dfn" href="#cddl" id="ref-for-cddl">CDDL</a> type <code>AuthenticationExtensionsAuthenticatorInputs</code> defines a <a data-link-type="dfn" href="#cbor" id="ref-for-cbor⑤">CBOR</a> map
 containing the <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input">authenticator extension input</a> values for zero or more <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑤">WebAuthn Extensions</a>.
 Extensions can add members as described in <a href="#sctn-extension-request-parameters">§ 9.3 Extending Request Parameters</a>.</p>
-   <p>This type is not exposed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤②">Relying Party</a>, but is used by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⓪">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①④">authenticator</a>.</p>
+   <p>This type is not exposed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤③">Relying Party</a>, but is used by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑦">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①④">authenticator</a>.</p>
    <h4 class="heading settled" data-level="5.7.4" id="iface-authentication-extensions-authenticator-outputs"><span class="secno">5.7.4. </span><span class="content">Authentication Extensions Authenticator Outputs (CDDL type <code>AuthenticationExtensionsAuthenticatorOutputs</code>)</span><a class="self-link" href="#iface-authentication-extensions-authenticator-outputs"></a></h4>
 <pre>AuthenticationExtensionsAuthenticatorOutputs = {
   * $$extensionOutput .within ( tstr => any )
@@ -3377,35 +3499,35 @@ <h3 class="heading settled" data-level="5.8" id="sctn-supporting-data-structures
    <p>The <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③③">public key credential</a> type uses certain data structures that are specified in supporting specifications. These are as
 follows.</p>
    <h4 class="heading settled" data-level="5.8.1" id="dictionary-client-data"><span class="secno">5.8.1. </span><span class="content">Client Data Used in <a data-link-type="dfn" href="#webauthn-signature" id="ref-for-webauthn-signature">WebAuthn Signatures</a> (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-collectedclientdata"><code>CollectedClientData</code></dfn>)</span><a class="self-link" href="#dictionary-client-data"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-data">client data</dfn> represents the contextual bindings of both the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party①⑨">WebAuthn Relying Party</a> and the <a data-link-type="dfn" href="#client" id="ref-for-client⑤①">client</a>. It is a key-value
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-data">client data</dfn> represents the contextual bindings of both the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②①">WebAuthn Relying Party</a> and the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑧">client</a>. It is a key-value
 mapping whose keys are strings. Values can be any type that has a valid encoding in JSON. Its structure is defined by the
 following Web IDL.</p>
    <p class="note" role="note"><span>Note:</span> The <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata②">CollectedClientData</a></code> may be extended in the future. Therefore it’s critical when parsing to be tolerant of unknown keys and of any reordering of the keys. See also <a href="#clientdatajson-verification">§ 5.8.1.2 Limited Verification Algorithm</a>.</p>
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata③"><c- g>CollectedClientData</c-></a> {
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②④"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-type" id="ref-for-dom-collectedclientdata-type②"><c- g>type</c-></a>;
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑤"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge②"><c- g>challenge</c-></a>;
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑥"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin②"><c- g>origin</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③"><c- b>boolean</c-></a>                      <a class="idl-code" data-link-type="dict-member" data-type="boolean                      " href="#dom-collectedclientdata-crossorigin" id="ref-for-dom-collectedclientdata-crossorigin②"><c- g>crossOrigin</c-></a>;        
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④①"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-type" id="ref-for-dom-collectedclientdata-type②"><c- g>type</c-></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④②"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge②"><c- g>challenge</c-></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④③"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin②"><c- g>origin</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③"><c- b>boolean</c-></a>                      <a class="idl-code" data-link-type="dict-member" data-type="boolean                      " href="#dom-collectedclientdata-crossorigin" id="ref-for-dom-collectedclientdata-crossorigin②"><c- g>crossOrigin</c-></a>;
 };
 
 <c- b>dictionary</c-> <dfn class="idl-code" data-dfn-type="dictionary" data-export id="dictdef-tokenbinding"><code><c- g>TokenBinding</c-></code><a class="self-link" href="#dictdef-tokenbinding"></a></dfn> {
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑦"><c- b>DOMString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="DOMString " href="#dom-tokenbinding-status" id="ref-for-dom-tokenbinding-status"><c- g>status</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑧"><c- b>DOMString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="DOMString " href="#dom-tokenbinding-id" id="ref-for-dom-tokenbinding-id"><c- g>id</c-></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④④"><c- b>DOMString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="DOMString " href="#dom-tokenbinding-status" id="ref-for-dom-tokenbinding-status"><c- g>status</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④⑤"><c- b>DOMString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="DOMString " href="#dom-tokenbinding-id" id="ref-for-dom-tokenbinding-id"><c- g>id</c-></a>;
 };
 
 <c- b>enum</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-tokenbindingstatus"><code><c- g>TokenBindingStatus</c-></code></dfn> { <a class="idl-code" data-link-type="enum-value" href="#dom-tokenbindingstatus-present" id="ref-for-dom-tokenbindingstatus-present"><c- s>"present"</c-></a>, <a class="idl-code" data-link-type="enum-value" href="#dom-tokenbindingstatus-supported" id="ref-for-dom-tokenbindingstatus-supported"><c- s>"supported"</c-></a> };
 </pre>
    <div>
     <dl>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CollectedClientData" data-dfn-type="dict-member" data-export id="dom-collectedclientdata-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②⑨">DOMString</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CollectedClientData" data-dfn-type="dict-member" data-export id="dom-collectedclientdata-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④⑥">DOMString</a></span>
      <dd data-md>
       <p>This member contains the string "webauthn.create" when creating new credentials, and "webauthn.get" when getting an
 assertion from an existing credential. The purpose of this member is to prevent certain types of signature confusion
 attacks (where an attacker substitutes one legitimate signature for another).</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CollectedClientData" data-dfn-type="dict-member" data-export id="dom-collectedclientdata-challenge"><code>challenge</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⓪">DOMString</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CollectedClientData" data-dfn-type="dict-member" data-export id="dom-collectedclientdata-challenge"><code>challenge</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④⑦">DOMString</a></span>
      <dd data-md>
-      <p>This member contains the base64url encoding of the challenge provided by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤③">Relying Party</a>. See the <a href="#sctn-cryptographic-challenges">§ 13.4.3 Cryptographic Challenges</a> security consideration.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CollectedClientData" data-dfn-type="dict-member" data-export id="dom-collectedclientdata-origin"><code>origin</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③①">DOMString</a></span>
+      <p>This member contains the base64url encoding of the challenge provided by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤④">Relying Party</a>. See the <a href="#sctn-cryptographic-challenges">§ 13.4.3 Cryptographic Challenges</a> security consideration.</p>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CollectedClientData" data-dfn-type="dict-member" data-export id="dom-collectedclientdata-origin"><code>origin</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④⑧">DOMString</a></span>
      <dd data-md>
       <p>This member contains the fully qualified <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①②">origin</a> of the requester, as provided to the authenticator by the client, in
 the syntax defined by <a data-link-type="biblio" href="#biblio-rfc6454">[RFC6454]</a>.</p>
@@ -3416,28 +3538,28 @@ <h4 class="heading settled" data-level="5.8.1" id="dictionary-client-data"><span
      <dt data-md>[RESERVED] <dfn data-dfn-for="CollectedClientData" data-dfn-type="dfn" data-noexport id="collectedclientdata-tokenbinding">tokenBinding<a class="self-link" href="#collectedclientdata-tokenbinding"></a></dfn>
      <dd data-md>
       <p>This OPTIONAL member contains information about the state of the <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8471#section-1" id="ref-for-section-1">Token Binding</a> protocol <a data-link-type="biblio" href="#biblio-tokenbinding">[TokenBinding]</a> used when communicating
-with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤④">Relying Party</a>. Its absence indicates that the client doesn’t support token binding</p>
+with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑤">Relying Party</a>. Its absence indicates that the client doesn’t support token binding</p>
       <p class="note" role="note"><span>Note:</span> While <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8471#section-1" id="ref-for-section-1①">Token Binding</a> was present in Level 1 and Level 2 of WebAuthn, its use is not expected in Level 3. The <code class="idl"><a data-link-type="idl" href="https://www.w3.org/TR/webauthn/#dom-collectedclientdata-tokenbinding" id="ref-for-dom-collectedclientdata-tokenbinding">tokenBinding</a></code> field is reserved so that it will not be reused for a different purpose.</p>
       <div>
        <dl>
-        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="TokenBinding" data-dfn-type="dict-member" data-export id="dom-tokenbinding-status"><code>status</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③②">DOMString</a></span>
+        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="TokenBinding" data-dfn-type="dict-member" data-export id="dom-tokenbinding-status"><code>status</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString④⑨">DOMString</a></span>
         <dd data-md>
          <p>This member SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-tokenbindingstatus" id="ref-for-enumdef-tokenbindingstatus">TokenBindingStatus</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⑦">client platforms</a> MUST ignore unknown values, treating an unknown value as if the <code class="idl"><a data-link-type="idl" href="https://www.w3.org/TR/webauthn/#dom-collectedclientdata-tokenbinding" id="ref-for-dom-collectedclientdata-tokenbinding①">tokenBinding</a></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists⑤">member does not exist</a>. When known, this member is one of the following:</p>
          <div>
           <dl>
            <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="TokenBindingStatus" data-dfn-type="enum-value" data-export data-lt="&quot;supported&quot;|supported" id="dom-tokenbindingstatus-supported"><code>supported</code></dfn>
            <dd data-md>
-            <p>Indicates the client supports token binding, but it was not negotiated when communicating with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑤">Relying Party</a>.</p>
+            <p>Indicates the client supports token binding, but it was not negotiated when communicating with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑥">Relying Party</a>.</p>
            <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="TokenBindingStatus" data-dfn-type="enum-value" data-export data-lt="&quot;present&quot;|present" id="dom-tokenbindingstatus-present"><code>present</code></dfn>
            <dd data-md>
-            <p>Indicates token binding was used when communicating with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑥">Relying Party</a>. In this case, the <code class="idl"><a data-link-type="idl" href="#dom-tokenbinding-id" id="ref-for-dom-tokenbinding-id①">id</a></code> member MUST be present.</p>
+            <p>Indicates token binding was used when communicating with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑦">Relying Party</a>. In this case, the <code class="idl"><a data-link-type="idl" href="#dom-tokenbinding-id" id="ref-for-dom-tokenbinding-id①">id</a></code> member MUST be present.</p>
           </dl>
          </div>
          <p class="note" role="note"><span>Note:</span> The <code class="idl"><a data-link-type="idl" href="#enumdef-tokenbindingstatus" id="ref-for-enumdef-tokenbindingstatus①">TokenBindingStatus</a></code> enumeration is deliberately not referenced, see <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.</p>
-        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="TokenBinding" data-dfn-type="dict-member" data-export id="dom-tokenbinding-id"><code>id</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③③">DOMString</a></span>
+        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="TokenBinding" data-dfn-type="dict-member" data-export id="dom-tokenbinding-id"><code>id</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤⓪">DOMString</a></span>
         <dd data-md>
-         <p>This member MUST be present if <code class="idl"><a data-link-type="idl" href="#dom-tokenbinding-status" id="ref-for-dom-tokenbinding-status①">status</a></code> is <code class="idl"><a data-link-type="idl" href="#dom-tokenbindingstatus-present" id="ref-for-dom-tokenbindingstatus-present①">present</a></code>, and MUST be a <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑤">base64url
-encoding</a> of the <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8471#section-3.2" id="ref-for-section-3.2">Token Binding ID</a> that was used when communicating with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑦">Relying Party</a>.</p>
+         <p>This member MUST be present if <code class="idl"><a data-link-type="idl" href="#dom-tokenbinding-status" id="ref-for-dom-tokenbinding-status①">status</a></code> is <code class="idl"><a data-link-type="idl" href="#dom-tokenbindingstatus-present" id="ref-for-dom-tokenbindingstatus-present①">present</a></code>, and MUST be a <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑨">base64url
+encoding</a> of the <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8471#section-3.2" id="ref-for-section-3.2">Token Binding ID</a> that was used when communicating with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑧">Relying Party</a>.</p>
        </dl>
       </div>
       <p class="note" role="note"><span>Note:</span> Obtaining a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8471#section-3.2" id="ref-for-section-3.2①">Token Binding ID</a> is a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⑧">client platform</a>-specific operation.</p>
@@ -3453,7 +3575,7 @@ <h4 class="heading settled" data-level="5.8.1" id="dictionary-client-data"><span
     </dl>
    </div>
    <h5 class="heading settled" data-level="5.8.1.1" id="clientdatajson-serialization"><span class="secno">5.8.1.1. </span><span class="content">Serialization</span><a class="self-link" href="#clientdatajson-serialization"></a></h5>
-   <p>The serialization of the <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata⑥">CollectedClientData</a></code> is a subset of the algorithm for <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#serialize-a-javascript-value-to-json-bytes" id="ref-for-serialize-a-javascript-value-to-json-bytes">JSON-serializing to bytes</a>. I.e. it produces a valid JSON encoding of the <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata⑦">CollectedClientData</a></code> but also provides additional structure that may be exploited by verifiers to avoid integrating a full JSON parser. While verifiers are recommended to perform standard JSON parsing, they may use the <a href="#clientdatajson-verification">more limited algorithm</a> below in contexts where a full JSON parser is too large. This verification algorithm requires only <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑥">base64url encoding</a>, appending of bytestrings (which could be implemented by writing into a fixed template), and three conditional checks (assuming that inputs are known not to need escaping).</p>
+   <p>The serialization of the <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata⑥">CollectedClientData</a></code> is a subset of the algorithm for <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#serialize-a-javascript-value-to-json-bytes" id="ref-for-serialize-a-javascript-value-to-json-bytes">JSON-serializing to bytes</a>. I.e. it produces a valid JSON encoding of the <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientdata" id="ref-for-dictdef-collectedclientdata⑦">CollectedClientData</a></code> but also provides additional structure that may be exploited by verifiers to avoid integrating a full JSON parser. While verifiers are recommended to perform standard JSON parsing, they may use the <a href="#clientdatajson-verification">more limited algorithm</a> below in contexts where a full JSON parser is too large. This verification algorithm requires only <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⓪">base64url encoding</a>, appending of bytestrings (which could be implemented by writing into a fixed template), and three conditional checks (assuming that inputs are known not to need escaping).</p>
    <p>The serialization algorithm works by appending successive byte strings to an, initially empty, partial result until the complete result is obtained.</p>
    <ol>
     <li data-md>
@@ -3547,7 +3669,7 @@ <h5 class="heading settled" data-level="5.8.1.2" id="clientdatajson-verification
       <li data-md>
        <p>A string, <var>type</var>, that contains the expected <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-type" id="ref-for-dom-collectedclientdata-type⑤">type</a></code>.</p>
       <li data-md>
-       <p>A byte string, <var>challenge</var>, that contains the challenge byte string that was given in the <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions④">PublicKeyCredentialRequestOptions</a></code> or <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions③">PublicKeyCredentialCreationOptions</a></code>.</p>
+       <p>A byte string, <var>challenge</var>, that contains the challenge byte string that was given in the <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑧">PublicKeyCredentialRequestOptions</a></code> or <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑦">PublicKeyCredentialCreationOptions</a></code>.</p>
       <li data-md>
        <p>A string, <var>origin</var>, that contains the expected <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑤">origin</a></code> that issued the request to the user agent.</p>
       <li data-md>
@@ -3562,7 +3684,7 @@ <h5 class="heading settled" data-level="5.8.1.2" id="clientdatajson-verification
     <li data-md>
      <p>Append 0x2c226368616c6c656e6765223a (<code>,"challenge":</code>) to <var>expected</var>.</p>
     <li data-md>
-     <p>Perform <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑦">base64url encoding</a> on <var>challenge</var> to produce a string, <var>challengeBase64</var>.</p>
+     <p>Perform <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①①">base64url encoding</a> on <var>challenge</var> to produce a string, <var>challengeBase64</var>.</p>
     <li data-md>
      <p>Append <a data-link-type="dfn" href="#ccdtostring" id="ref-for-ccdtostring④">CCDToString</a>(<var>challengeBase64</var>) to <var>expected</var>.</p>
     <li data-md>
@@ -3618,35 +3740,35 @@ <h4 class="heading settled" data-level="5.8.2" id="enum-credentialType"><span cl
    </div>
    <h4 class="heading settled" data-level="5.8.3" id="dictionary-credential-descriptor"><span class="secno">5.8.3. </span><span class="content">Credential Descriptor (dictionary <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-publickeycredentialdescriptor"><code>PublicKeyCredentialDescriptor</code></dfn>)</span><a class="self-link" href="#dictionary-credential-descriptor"></a></h4>
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑦"><c- g>PublicKeyCredentialDescriptor</c-></a> {
-    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③④"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString                    " href="#dom-publickeycredentialdescriptor-type" id="ref-for-dom-publickeycredentialdescriptor-type①"><c- g>type</c-></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤①"><c- b>DOMString</c-></a>                    <a class="idl-code" data-link-type="dict-member" data-type="DOMString                    " href="#dom-publickeycredentialdescriptor-type" id="ref-for-dom-publickeycredentialdescriptor-type①"><c- g>type</c-></a>;
     <c- b>required</c-> <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource⑧"><c- n>BufferSource</c-></a>                 <a class="idl-code" data-link-type="dict-member" data-type="BufferSource                 " href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id①"><c- g>id</c-></a>;
-    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence④"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑤"><c- b>DOMString</c-></a>>                   <a class="idl-code" data-link-type="dict-member" data-type="sequence<DOMString>                   " href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑨"><c- g>transports</c-></a>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑨"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤②"><c- b>DOMString</c-></a>>                   <a class="idl-code" data-link-type="dict-member" data-type="sequence<DOMString>                   " href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports④"><c- g>transports</c-></a>;
 };
 </pre>
    <p>This dictionary identifies a specific <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③④">public key credential</a>.
-It is used in <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑧">create()</a></code> to prevent creating duplicate credentials on the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⑤">authenticator</a>,
-and in <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②③">get()</a></code> to determine if and how the credential can currently be reached by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤②">client</a>.
-It mirrors some fields of the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⑥">PublicKeyCredential</a></code> object returned by <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑨">create()</a></code> and <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②④">get()</a></code>.</p>
+It is used in <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create①⑨">create()</a></code> to prevent creating duplicate credentials on the same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⑤">authenticator</a>,
+and in <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②④">get()</a></code> to determine if and how the credential can currently be reached by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑨">client</a>.
+It mirrors some fields of the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⑨">PublicKeyCredential</a></code> object returned by <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⓪">create()</a></code> and <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑤">get()</a></code>.</p>
    <div>
     <dl>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialDescriptor" data-dfn-type="dict-member" data-export id="dom-publickeycredentialdescriptor-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑥">DOMString</a></span>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialDescriptor" data-dfn-type="dict-member" data-export id="dom-publickeycredentialdescriptor-type"><code>type</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤③">DOMString</a></span>
      <dd data-md>
       <p>This member contains the type of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑤">public key credential</a> the caller is referring to. The value SHOULD be a member of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype⑦">PublicKeyCredentialType</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform③⑨">client platforms</a> MUST ignore any <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑧">PublicKeyCredentialDescriptor</a></code> with an unknown <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-type" id="ref-for-dom-publickeycredentialdescriptor-type②">type</a></code>.</p>
-      <p>This mirrors the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-type" id="ref-for-dom-credential-type①">type</a></code> field of <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⑦">PublicKeyCredential</a></code>.</p>
+      <p>This mirrors the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-type" id="ref-for-dom-credential-type①">type</a></code> field of <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⓪">PublicKeyCredential</a></code>.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialDescriptor" data-dfn-type="dict-member" data-export id="dom-publickeycredentialdescriptor-id"><code>id</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource⑨">BufferSource</a></span>
      <dd data-md>
       <p>This member contains the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②①">credential ID</a> of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑥">public key credential</a> the caller is referring to.</p>
-      <p>This mirrors the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-rawid" id="ref-for-dom-publickeycredential-rawid①">rawId</a></code> field of <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⑧">PublicKeyCredential</a></code>.</p>
-     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialDescriptor" data-dfn-type="dict-member" data-export id="dom-publickeycredentialdescriptor-transports"><code>transports</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑦">DOMString</a>></span>
+      <p>This mirrors the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-rawid" id="ref-for-dom-publickeycredential-rawid①">rawId</a></code> field of <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②①">PublicKeyCredential</a></code>.</p>
+     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PublicKeyCredentialDescriptor" data-dfn-type="dict-member" data-export id="dom-publickeycredentialdescriptor-transports"><code>transports</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤④">DOMString</a>></span>
      <dd data-md>
-      <p>This OPTIONAL member contains a hint as to how the <a data-link-type="dfn" href="#client" id="ref-for-client⑤③">client</a> might communicate with the <a data-link-type="dfn" href="#public-key-credential-source-managing-authenticator" id="ref-for-public-key-credential-source-managing-authenticator①①">managing authenticator</a> of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑦">public key credential</a> the caller is referring to. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport②">AuthenticatorTransport</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⓪">client platforms</a> MUST ignore unknown values.</p>
-      <p>This mirrors the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response④">response</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports①">getTransports()</a></code></code> method
-of a <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential①⑨">PublicKeyCredential</a></code> structure created by a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⓪">create()</a></code> operation.
+      <p>This OPTIONAL member contains a hint as to how the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⓪">client</a> might communicate with the <a data-link-type="dfn" href="#public-key-credential-source-managing-authenticator" id="ref-for-public-key-credential-source-managing-authenticator①①">managing authenticator</a> of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑦">public key credential</a> the caller is referring to. The values SHOULD be members of <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport②">AuthenticatorTransport</a></code> but <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⓪">client platforms</a> MUST ignore unknown values.</p>
+      <p>This mirrors the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response④">response</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports②">getTransports()</a></code></code> method
+of a <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②②">PublicKeyCredential</a></code> structure created by a <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②①">create()</a></code> operation.
 When <a href="#sctn-registering-a-new-credential">registering a new credential</a>,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑧">Relying Party</a> SHOULD store the value returned from <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports②">getTransports()</a></code>.
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑨">Relying Party</a> SHOULD store the value returned from <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports③">getTransports()</a></code>.
 When creating a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor⑨">PublicKeyCredentialDescriptor</a></code> for that credential,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑤⑨">Relying Party</a> SHOULD retrieve that stored value
-and set it as the value of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports①⓪">transports</a></code> member.</p>
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⓪">Relying Party</a> SHOULD retrieve that stored value
+and set it as the value of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑤">transports</a></code> member.</p>
     </dl>
    </div>
    <h4 class="heading settled" data-level="5.8.4" id="enum-transport"><span class="secno">5.8.4. </span><span class="content">Authenticator Transport Enumeration (enum <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-authenticatortransport"><code>AuthenticatorTransport</code></dfn>)</span><a class="self-link" href="#enum-transport"></a></h4>
@@ -3659,9 +3781,9 @@ <h4 class="heading settled" data-level="5.8.4" id="enum-transport"><span class="
 </pre>
    <p class="note" role="note"><span>Note:</span> The <code class="idl"><a data-link-type="idl" href="#enumdef-authenticatortransport" id="ref-for-enumdef-authenticatortransport④">AuthenticatorTransport</a></code> enumeration is deliberately not referenced, see <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.</p>
    <div>
-     <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⑥">Authenticators</a> may implement various <a href="#enum-transport">transports</a> for communicating with <a data-link-type="dfn" href="#client" id="ref-for-client⑤④">clients</a>. This enumeration
+     <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①①⑥">Authenticators</a> may implement various <a href="#enum-transport">transports</a> for communicating with <a data-link-type="dfn" href="#client" id="ref-for-client⑥①">clients</a>. This enumeration
     defines hints as to how clients might communicate with a particular authenticator in order to obtain an assertion for a
-    specific credential. Note that these hints represent the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⓪">WebAuthn Relying Party</a>'s best belief as to how an authenticator may be reached. A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⓪">Relying Party</a> will typically learn of the supported transports for a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑧">public key credential</a> via <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports③">getTransports()</a></code>. 
+    specific credential. Note that these hints represent the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②②">WebAuthn Relying Party</a>'s best belief as to how an authenticator may be reached. A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥①">Relying Party</a> will typically learn of the supported transports for a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential③⑧">public key credential</a> via <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports④">getTransports()</a></code>. 
     <dl>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticatorTransport" data-dfn-type="enum-value" data-export data-lt="&quot;usb&quot;|usb" id="dom-authenticatortransport-usb"><code>usb</code></dfn>
      <dd data-md>
@@ -3706,23 +3828,23 @@ <h4 class="heading settled" data-level="5.8.6" id="enum-userVerificationRequirem
     <a class="idl-code" data-link-type="enum-value" href="#dom-userverificationrequirement-discouraged" id="ref-for-dom-userverificationrequirement-discouraged④"><c- s>"discouraged"</c-></a>
 };
 </pre>
-   <p>A <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②①">WebAuthn Relying Party</a> may require <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②②">user verification</a> for some of its operations but not for others, and may use this type to express its
+   <p>A <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②③">WebAuthn Relying Party</a> may require <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②②">user verification</a> for some of its operations but not for others, and may use this type to express its
 needs.</p>
    <p class="note" role="note"><span>Note:</span> The <code class="idl"><a data-link-type="idl" href="#enumdef-userverificationrequirement" id="ref-for-enumdef-userverificationrequirement⑤">UserVerificationRequirement</a></code> enumeration is deliberately not referenced, see <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.</p>
    <div>
     <dl>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="UserVerificationRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;required&quot;|required" id="dom-userverificationrequirement-required"><code>required</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥①">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②③">user verification</a> for the operation and will fail the overall <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony⑨">ceremony</a> if the
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥②">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②③">user verification</a> for the operation and will fail the overall <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony⑨">ceremony</a> if the
 response does not have the <a data-link-type="dfn" href="#uv" id="ref-for-uv">UV</a> <a data-link-type="dfn" href="#flags" id="ref-for-flags②">flag</a> set.
-The <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑤">client</a> MUST return an error if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②④">user verification</a> cannot be performed.</p>
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑥②">client</a> MUST return an error if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②④">user verification</a> cannot be performed.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="UserVerificationRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;preferred&quot;|preferred" id="dom-userverificationrequirement-preferred"><code>preferred</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥②">Relying Party</a> prefers <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⑤">user verification</a> for the operation if possible, but will not fail the
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥③">Relying Party</a> prefers <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⑤">user verification</a> for the operation if possible, but will not fail the
 operation if the response does not have the <a data-link-type="dfn" href="#uv" id="ref-for-uv①">UV</a> <a data-link-type="dfn" href="#flags" id="ref-for-flags③">flag</a> set.</p>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="UserVerificationRequirement" data-dfn-type="enum-value" data-export data-lt="&quot;discouraged&quot;|discouraged" id="dom-userverificationrequirement-discouraged"><code>discouraged</code></dfn>
      <dd data-md>
-      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥③">Relying Party</a> does not want <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⑥">user verification</a> employed during the operation (e.g., in the
+      <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥④">Relying Party</a> does not want <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification②⑥">user verification</a> employed during the operation (e.g., in the
 interest of minimizing disruption to the user interaction flow).</p>
     </dl>
    </div>
@@ -3737,37 +3859,37 @@ <h3 class="heading settled" data-level="5.9" id="sctn-permissions-policy"><span
       <hr>
       <span class="opera no"><span>Opera</span><span>None</span></span><span class="edge_blink yes"><span>Edge</span><span>84+</span></span>
       <hr>
-      <span class="edge no"><span>Edge (Legacy)</span><span>None</span></span><span class="ie no"><span>IE</span><span>None</span></span>
+      <span class="edge no"><span>Edge (Legacy)</span><span>?</span></span><span class="ie no"><span>IE</span><span>None</span></span>
       <hr>
-      <span class="firefox_android no"><span>Firefox for Android</span><span>None</span></span><span class="safari_ios no"><span>iOS Safari</span><span>None</span></span><span class="chrome_android yes"><span>Chrome for Android</span><span>84+</span></span><span class="webview_android yes"><span>Android WebView</span><span>84+</span></span><span class="samsunginternet_android yes"><span>Samsung Internet</span><span>14.0+</span></span><span class="opera_android no"><span>Opera Mobile</span><span>None</span></span>
+      <span class="firefox_android no"><span>Firefox for Android</span><span>?</span></span><span class="safari_ios no"><span>iOS Safari</span><span>?</span></span><span class="chrome_android no"><span>Chrome for Android</span><span>?</span></span><span class="webview_android no"><span>Android WebView</span><span>?</span></span><span class="samsunginternet_android no"><span>Samsung Internet</span><span>?</span></span><span class="opera_android no"><span>Opera Mobile</span><span>None</span></span>
      </div>
     </div>
    </div>
    <p>This specification defines one <a data-link-type="dfn" href="https://w3c.github.io/webappsec-permissions-policy/#policy-controlled-feature" id="ref-for-policy-controlled-feature">policy-controlled feature</a> identified by
 the feature-identifier token "<code><dfn class="dfn-paneled" data-dfn-type="dfn" data-export data-lt="publickey-credentials-get-feature" id="publickey-credentials-get-feature">publickey-credentials-get</dfn></code>".
 Its <a data-link-type="dfn" href="https://w3c.github.io/webappsec-permissions-policy/#default-allowlist" id="ref-for-default-allowlist">default allowlist</a> is '<code>self</code>'. <a data-link-type="biblio" href="#biblio-permissions-policy">[Permissions-Policy]</a></p>
-   <p>A <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#document" id="ref-for-document">Document</a></code>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/dom.html#concept-document-permissions-policy" id="ref-for-concept-document-permissions-policy②">permissions policy</a> determines whether any content in that <a href="https://html.spec.whatwg.org/multipage/dom.html#documents">document</a> is <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#allowed-to-use" id="ref-for-allowed-to-use①">allowed to successfully invoke</a> the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①②">Web Authentication API</a>, i.e., via <code><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑤">navigator.credentials.get({publicKey:..., ...})</a></code>.
+   <p>A <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#document" id="ref-for-document">Document</a></code>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/dom.html#concept-document-permissions-policy" id="ref-for-concept-document-permissions-policy②">permissions policy</a> determines whether any content in that <a href="https://html.spec.whatwg.org/multipage/dom.html#documents">document</a> is <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#allowed-to-use" id="ref-for-allowed-to-use①">allowed to successfully invoke</a> the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①②">Web Authentication API</a>, i.e., via <code><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑥">navigator.credentials.get({publicKey:..., ...})</a></code>.
 If disabled in any document, no content in the document will be <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#allowed-to-use" id="ref-for-allowed-to-use②">allowed to use</a> the foregoing methods: attempting to do so will <a href="https://www.w3.org/2001/tag/doc/promises-guide#errors">return an error</a>.</p>
    <p class="note" role="note"><span>Note:</span> Algorithms specified in <a data-link-type="biblio" href="#biblio-credential-management-1">[CREDENTIAL-MANAGEMENT-1]</a> perform the actual permissions policy evaluation. This is because such policy evaluation needs to occur when there is access to the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#current-settings-object" id="ref-for-current-settings-object">current settings object</a>. The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot⑨">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> <a data-link-type="dfn" href="https://tc39.github.io/ecma262/#sec-object-internal-methods-and-internal-slots" id="ref-for-sec-object-internal-methods-and-internal-slots①⑦">internal method</a> does not have such access since it is invoked <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/infrastructure.html#in-parallel" id="ref-for-in-parallel">in parallel</a> by <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#credentialscontainer" id="ref-for-credentialscontainer③">CredentialsContainer</a></code>'s <a data-link-type="abstract-op" href="https://w3c.github.io/webappsec-credential-management/#abstract-opdef-request-a-credential" id="ref-for-abstract-opdef-request-a-credential①">Request a <code>Credential</code></a> abstract operation <a data-link-type="biblio" href="#biblio-credential-management-1">[CREDENTIAL-MANAGEMENT-1]</a>.</p>
    <h3 class="heading settled" data-level="5.10" id="sctn-iframe-guidance"><span class="secno">5.10. </span><span class="content">Using Web Authentication within <code>iframe</code> elements</span><a class="self-link" href="#sctn-iframe-guidance"></a></h3>
    <p>The <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①③">Web Authentication API</a> is disabled by default in cross-origin <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element①">iframe</a></code>s.
 To override this default policy and indicate that a cross-origin <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element②">iframe</a></code> is allowed to invoke the <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①④">Web Authentication API</a>'s <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot①⓪">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> method, specify the <code><a data-link-type="element-sub" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-allow" id="ref-for-attr-iframe-allow">allow</a></code> attribute on the <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element③">iframe</a></code> element and include the <code><a data-link-type="dfn" href="#publickey-credentials-get-feature" id="ref-for-publickey-credentials-get-feature">publickey-credentials-get</a></code> feature-identifier token in the <code><a data-link-type="element-sub" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-allow" id="ref-for-attr-iframe-allow①">allow</a></code> attribute’s value.</p>
-   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥④">Relying Parties</a> utilizing the WebAuthn API in an embedded context should review <a href="#sctn-seccons-visibility">§ 13.4.2 Visibility Considerations for Embedded Usage</a> regarding <a data-link-type="dfn" href="#ui-redressing" id="ref-for-ui-redressing">UI redressing</a> and its possible mitigations.</p>
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑤">Relying Parties</a> utilizing the WebAuthn API in an embedded context should review <a href="#sctn-seccons-visibility">§ 13.4.2 Visibility Considerations for Embedded Usage</a> regarding <a data-link-type="dfn" href="#ui-redressing" id="ref-for-ui-redressing">UI redressing</a> and its possible mitigations.</p>
    <h2 class="heading settled" data-level="6" id="sctn-authenticator-model"><span class="secno">6. </span><span class="content">WebAuthn <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-model">Authenticator Model</dfn></span><a class="self-link" href="#sctn-authenticator-model"></a></h2>
    <p><a href="#sctn-api">The Web Authentication API</a> implies a specific abstract functional model for a <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator④">WebAuthn Authenticator</a>. This section
 describes that <a data-link-type="dfn" href="#authenticator-model" id="ref-for-authenticator-model②">authenticator model</a>.</p>
    <p><a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④①">Client platforms</a> MAY implement and expose this abstract model in any way desired. However, the behavior of the client’s Web
 Authentication API implementation, when operating on the authenticators supported by that <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④②">client platform</a>, MUST be indistinguishable
 from the behavior specified in <a href="#sctn-api">§ 5 Web Authentication API</a>.</p>
-   <p class="note" role="note"><span>Note:</span> <a data-link-type="biblio" href="#biblio-fido-ctap">[FIDO-CTAP]</a> is an example of a concrete instantiation of this model, but it is one in which there are differences in the data it returns and those expected by the <a href="#sctn-api">WebAuthn API</a>'s algorithms. The CTAP2 response messages are CBOR maps constructed using integer keys rather than the string keys defined in this specification for the same objects. The <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑥">client</a> is expected to perform any needed transformations on such data. The <a data-link-type="biblio" href="#biblio-fido-ctap">[FIDO-CTAP]</a> specification details the mapping between CTAP2 integer keys and WebAuthn string keys, in section <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#responses" id="ref-for-responses">§6.2. Responses</a>.</p>
+   <p class="note" role="note"><span>Note:</span> <a data-link-type="biblio" href="#biblio-fido-ctap">[FIDO-CTAP]</a> is an example of a concrete instantiation of this model, but it is one in which there are differences in the data it returns and those expected by the <a href="#sctn-api">WebAuthn API</a>'s algorithms. The CTAP2 response messages are CBOR maps constructed using integer keys rather than the string keys defined in this specification for the same objects. The <a data-link-type="dfn" href="#client" id="ref-for-client⑥③">client</a> is expected to perform any needed transformations on such data. The <a data-link-type="biblio" href="#biblio-fido-ctap">[FIDO-CTAP]</a> specification details the mapping between CTAP2 integer keys and WebAuthn string keys, in section <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#responses" id="ref-for-responses">§6.2. Responses</a>.</p>
    <p>For authenticators, this model defines the logical operations that they MUST support, and the data formats that they expose to
-the client and the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②②">WebAuthn Relying Party</a>. However, it does not define the details of how authenticators communicate with the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device②⓪">client device</a>,
-unless they are necessary for interoperability with <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑤">Relying Parties</a>. For instance, this abstract model does not define protocols for
+the client and the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②④">WebAuthn Relying Party</a>. However, it does not define the details of how authenticators communicate with the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device②⓪">client device</a>,
+unless they are necessary for interoperability with <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑥">Relying Parties</a>. For instance, this abstract model does not define protocols for
 connecting authenticators to clients over transports such as USB or NFC. Similarly, this abstract model does not define specific
 error codes or methods of returning them; however, it does define error behavior in terms of the needs of the client. Therefore,
 specific error codes are mentioned as a means of showing which error conditions MUST be distinguishable (or not) from each other
 in order to enable a compliant and secure client implementation.</p>
-   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑥">Relying Parties</a> may influence authenticator selection, if they deem necessary, by stipulating various authenticator characteristics
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑦">Relying Parties</a> may influence authenticator selection, if they deem necessary, by stipulating various authenticator characteristics
 when <a href="#sctn-createCredential">creating credentials</a> and/or when <a href="#sctn-getAssertion">generating assertions</a>, through use of <a href="#dictionary-makecredentialoptions">credential creation options</a> or <a href="#dictionary-assertion-options">assertion generation options</a>,
 respectively. The algorithms underlying the <a href="#sctn-api">WebAuthn API</a> marshal these options and pass them to the applicable <a href="#sctn-authenticator-ops">authenticator operations</a> defined below.</p>
    <p>In this abstract model, the authenticator provides key management and cryptographic signatures. It can be embedded in the
@@ -3779,12 +3901,12 @@ <h2 class="heading settled" data-level="6" id="sctn-authenticator-model"><span c
    <p>Additionally, each authenticator has an AAGUID, which is a 128-bit identifier indicating the type (e.g. make and model) of the
 authenticator. The AAGUID MUST be chosen by the manufacturer to be identical across all substantially identical authenticators
 made by that manufacturer, and different (with high probability) from the AAGUIDs of all other types of authenticators.
-The AAGUID for a given type of authenticator SHOULD be randomly generated to ensure this. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑦">Relying Party</a> MAY use the AAGUID to infer certain
+The AAGUID for a given type of authenticator SHOULD be randomly generated to ensure this. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑧">Relying Party</a> MAY use the AAGUID to infer certain
 properties of the authenticator, such as certification level and strength of key protection, using information from other sources.</p>
    <p>The primary function of the authenticator is to provide <a data-link-type="dfn" href="#webauthn-signature" id="ref-for-webauthn-signature①">WebAuthn signatures</a>, which are bound to various contextual data. These
 data are observed and added at different levels of the stack as a signature request passes from the server to the
 authenticator. In verifying a signature, the server checks these bindings against expected values. These contextual bindings
-are divided in two: Those added by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑧">Relying Party</a> or the client, referred to as <a data-link-type="dfn" href="#client-data" id="ref-for-client-data②">client data</a>; and those added by the authenticator,
+are divided in two: Those added by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑨">Relying Party</a> or the client, referred to as <a data-link-type="dfn" href="#client-data" id="ref-for-client-data②">client data</a>; and those added by the authenticator,
 referred to as the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①④">authenticator data</a>. The authenticator signs over the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data③">client data</a>, but is otherwise not interested in
 its contents. To save bandwidth and processing requirements on the authenticator, the client hashes the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data④">client data</a> and
 sends only the result to the authenticator. The authenticator signs over the combination of the <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data⑤">hash of the serialized client data</a>, and its own <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑤">authenticator data</a>.</p>
@@ -3797,7 +3919,7 @@ <h2 class="heading settled" data-level="6" id="sctn-authenticator-model"><span c
      <p>The data processed by the authenticator should be small and easy to interpret in low-level code. In particular, authenticators
 should not have to parse high-level encodings such as JSON.</p>
     <li data-md>
-     <p>Both the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑦">client</a> and the authenticator should have the flexibility to add contextual bindings as needed.</p>
+     <p>Both the <a data-link-type="dfn" href="#client" id="ref-for-client⑥④">client</a> and the authenticator should have the flexibility to add contextual bindings as needed.</p>
     <li data-md>
      <p>The design aims to reuse as much as possible of existing encoding formats in order to aid adoption and implementation.</p>
    </ul>
@@ -3820,10 +3942,10 @@ <h2 class="heading settled" data-level="6" id="sctn-authenticator-model"><span c
 The formats of these signatures, as well as the procedures for generating them, are specified below.</p>
    <h3 class="heading settled" data-level="6.1" id="sctn-authenticator-data"><span class="secno">6.1. </span><span class="content">Authenticator Data</span><a class="self-link" href="#sctn-authenticator-data"></a></h3>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-data">authenticator data</dfn> structure encodes contextual bindings made by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②⑥">authenticator</a>. These bindings are
-controlled by the authenticator itself, and derive their trust from the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②③">WebAuthn Relying Party</a>'s assessment of the security properties of the
+controlled by the authenticator itself, and derive their trust from the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑤">WebAuthn Relying Party</a>'s assessment of the security properties of the
 authenticator. In one extreme case, the authenticator may be embedded in the client, and its bindings may be no more trustworthy
 than the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data⑥">client data</a>. At the other extreme, the authenticator may be a discrete entity with high-security hardware and
-software, connected to the client over a secure channel. In both cases, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑥⑨">Relying Party</a> receives the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑥">authenticator data</a> in the same
+software, connected to the client over a secure channel. In both cases, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⓪">Relying Party</a> receives the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑥">authenticator data</a> in the same
 format, and uses its knowledge of the authenticator to make trust decisions.</p>
    <p>The <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data①⑦">authenticator data</a> has a compact but extensible encoding. This is desired since authenticators can be devices with
 limited capabilities and low power requirements, with much simpler software stacks than the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④③">client platform</a>.</p>
@@ -3914,11 +4036,11 @@ <h3 class="heading settled" data-level="6.1" id="sctn-authenticator-data"><span
     <figcaption> <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②①">Authenticator data</a> layout. The names in the Name column are only for reference within this document, and are not
         present in the actual representation of the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②②">authenticator data</a>. </figcaption>
    </figure>
-   <p>The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑧">RP ID</a> is originally received from the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑧">client</a> when the credential is created, and again when an <a data-link-type="dfn" href="#assertion" id="ref-for-assertion②">assertion</a> is generated.
+   <p>The <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑧">RP ID</a> is originally received from the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑤">client</a> when the credential is created, and again when an <a data-link-type="dfn" href="#assertion" id="ref-for-assertion②">assertion</a> is generated.
 However, it differs from other <a data-link-type="dfn" href="#client-data" id="ref-for-client-data⑦">client data</a> in some important ways. First, unlike the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data⑧">client data</a>, the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id②⑨">RP ID</a> of a
 credential does not change between operations but instead remains the same for the lifetime of that credential. Secondly, it is
 validated by the authenticator during the <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion⑧">authenticatorGetAssertion</a> operation, by verifying that the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⓪">RP ID</a> that
-the requested <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④②">credential</a> is <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑤">scoped</a> to exactly matches the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③①">RP ID</a> supplied by the <a data-link-type="dfn" href="#client" id="ref-for-client⑤⑨">client</a>.</p>
+the requested <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④②">credential</a> is <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑤">scoped</a> to exactly matches the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③①">RP ID</a> supplied by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑥">client</a>.</p>
    <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②⑦">Authenticators</a> <dfn class="dfn-paneled" data-dfn-for="authenticator data" data-dfn-type="dfn" data-noexport id="authenticator-data-perform-the-following-steps-to-generate-an-authenticator-data-structure">perform the following steps to generate an <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②③">authenticator data</a> structure</dfn>:</p>
    <ul>
     <li data-md>
@@ -3949,15 +4071,15 @@ <h3 class="heading settled" data-level="6.1" id="sctn-authenticator-data"><span
    </div>
    <h4 class="heading settled" data-level="6.1.1" id="sctn-sign-counter"><span class="secno">6.1.1. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="signature-counter">Signature Counter</dfn> Considerations</span><a class="self-link" href="#sctn-sign-counter"></a></h4>
    <p>Authenticators SHOULD implement a <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter②">signature counter</a> feature. These counters are conceptually stored for each credential
-by the authenticator, or globally for the authenticator as a whole. The initial value of a credential’s <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter③">signature counter</a> is specified in the <code><a data-link-type="dfn" href="#signcount" id="ref-for-signcount">signCount</a></code> value of the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②⑦">authenticator data</a> returned by <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①①">authenticatorMakeCredential</a>. The <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter④">signature counter</a> is incremented for each successful <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion⑨">authenticatorGetAssertion</a> operation by some positive value, and subsequent values are returned to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②④">WebAuthn Relying Party</a> within the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②⑧">authenticator data</a> again. The <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑤">signature counter</a>'s purpose is to aid <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⓪">Relying Parties</a> in detecting cloned authenticators. Clone
+by the authenticator, or globally for the authenticator as a whole. The initial value of a credential’s <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter③">signature counter</a> is specified in the <code><a data-link-type="dfn" href="#signcount" id="ref-for-signcount">signCount</a></code> value of the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②⑦">authenticator data</a> returned by <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①①">authenticatorMakeCredential</a>. The <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter④">signature counter</a> is incremented for each successful <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion⑨">authenticatorGetAssertion</a> operation by some positive value, and subsequent values are returned to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑥">WebAuthn Relying Party</a> within the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②⑧">authenticator data</a> again. The <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑤">signature counter</a>'s purpose is to aid <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦①">Relying Parties</a> in detecting cloned authenticators. Clone
 detection is more important for authenticators with limited protection measures.</p>
    <p>Authenticators that do not implement a <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑥">signature counter</a> leave the <code><a data-link-type="dfn" href="#signcount" id="ref-for-signcount①">signCount</a></code> in the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data②⑨">authenticator data</a> constant at zero.</p>
-   <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦①">Relying Party</a> stores the <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑦">signature counter</a> of the most recent <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⓪">authenticatorGetAssertion</a> operation. (Or the counter from the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①②">authenticatorMakeCredential</a> operation if no <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①①">authenticatorGetAssertion</a> has ever been performed on a credential.) In subsequent <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①②">authenticatorGetAssertion</a> operations, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦②">Relying Party</a> compares the stored <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑧">signature counter</a> value with the new <code><a data-link-type="dfn" href="#signcount" id="ref-for-signcount②">signCount</a></code> value returned in the assertion’s <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③⓪">authenticator data</a>.  If either is non-zero, and the new <code><a data-link-type="dfn" href="#signcount" id="ref-for-signcount③">signCount</a></code> value is less than or equal to the stored value, a cloned authenticator may exist, or the authenticator may be malfunctioning.</p>
-   <p>Detecting a <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑨">signature counter</a> mismatch does not indicate whether the current operation was performed by a cloned authenticator or the original authenticator. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦③">Relying Parties</a> should address this situation appropriately relative to their individual situations, i.e., their risk tolerance.</p>
+   <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦②">Relying Party</a> stores the <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑦">signature counter</a> of the most recent <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⓪">authenticatorGetAssertion</a> operation. (Or the counter from the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①②">authenticatorMakeCredential</a> operation if no <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①①">authenticatorGetAssertion</a> has ever been performed on a credential.) In subsequent <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①②">authenticatorGetAssertion</a> operations, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦③">Relying Party</a> compares the stored <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑧">signature counter</a> value with the new <code><a data-link-type="dfn" href="#signcount" id="ref-for-signcount②">signCount</a></code> value returned in the assertion’s <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③⓪">authenticator data</a>.  If either is non-zero, and the new <code><a data-link-type="dfn" href="#signcount" id="ref-for-signcount③">signCount</a></code> value is less than or equal to the stored value, a cloned authenticator may exist, or the authenticator may be malfunctioning.</p>
+   <p>Detecting a <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter⑨">signature counter</a> mismatch does not indicate whether the current operation was performed by a cloned authenticator or the original authenticator. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦④">Relying Parties</a> should address this situation appropriately relative to their individual situations, i.e., their risk tolerance.</p>
    <p>Authenticators:</p>
    <ul>
     <li data-md>
-     <p>SHOULD implement per credential <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①⓪">signature counters</a>.  This prevents the <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①①">signature counter</a> value from being shared between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦④">Relying Parties</a> and being possibly employed
+     <p>SHOULD implement per credential <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①⓪">signature counters</a>.  This prevents the <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①①">signature counter</a> value from being shared between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑤">Relying Parties</a> and being possibly employed
 as a correlation handle for the user. Authenticators MAY implement a global <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter①②">signature counter</a>,
 i.e., on a per-authenticator basis, but this is less privacy-friendly for users.</p>
     <li data-md>
@@ -4001,25 +4123,25 @@ <h4 class="heading settled" data-level="6.1.3" id="sctn-credential-backup"><span
     </table>
     <figcaption> <code>BE</code> and <code>BS</code> <a data-link-type="dfn" href="#flags" id="ref-for-flags①⑨">flag</a> combinations </figcaption>
    </figure>
-   <p>It is RECOMMENDED that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑤">Relying Parties</a> store the most recent value of these <a data-link-type="dfn" href="#flags" id="ref-for-flags②⓪">flags</a> with the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑥">user account</a> for future evaluation.</p>
-   <p>The following is a non-normative, non-exhaustive list of how <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑥">Relying Parties</a> might use these <a data-link-type="dfn" href="#flags" id="ref-for-flags②①">flags</a>:</p>
+   <p>It is RECOMMENDED that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑥">Relying Parties</a> store the most recent value of these <a data-link-type="dfn" href="#flags" id="ref-for-flags②⓪">flags</a> with the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑥">user account</a> for future evaluation.</p>
+   <p>The following is a non-normative, non-exhaustive list of how <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑦">Relying Parties</a> might use these <a data-link-type="dfn" href="#flags" id="ref-for-flags②①">flags</a>:</p>
    <ul>
     <li data-md>
      <p>Requiring additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②⑧">authenticators</a>:</p>
      <p>When <code>BE</code> <a data-link-type="dfn" href="#flags" id="ref-for-flags②②">flag</a> is set to <code>0</code>, the credential is a <a data-link-type="dfn" href="#single-device-credential" id="ref-for-single-device-credential②">single-device credential</a> and the <a data-link-type="dfn" href="#generating-authenticator" id="ref-for-generating-authenticator③">generating authenticator</a> will never
 allow the credential to be backed up.</p>
-     <p>A <a data-link-type="dfn" href="#single-device-credential" id="ref-for-single-device-credential③">single-device credential</a> is not resilient to single device loss. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑦">Relying Parties</a> SHOULD ensure that a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑦">user account</a> has additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②⑨">authenticators</a> <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑥">registered</a> and/or an account recovery process in place.</p>
+     <p>A <a data-link-type="dfn" href="#single-device-credential" id="ref-for-single-device-credential③">single-device credential</a> is not resilient to single device loss. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑧">Relying Parties</a> SHOULD ensure that a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑦">user account</a> has additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①②⑨">authenticators</a> <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑥">registered</a> and/or an account recovery process in place.</p>
      <p>For example, the user could be prompted to set up an additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③⓪">authenticator</a>, such as a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators⑦">roaming authenticator</a> or an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③①">authenticator</a> that is capable of <a data-link-type="dfn" href="#multi-device-credential" id="ref-for-multi-device-credential④">multi-device credentials</a>.</p>
     <li data-md>
      <p>Upgrading a user to a password-free account:</p>
      <p>When the <code>BS</code> <a data-link-type="dfn" href="#flags" id="ref-for-flags②③">flag</a> changes from <code>0</code> to <code>1</code>, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③②">authenticator</a> is signaling that the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①③">credential</a> is backed up and is protected from single device loss.</p>
-     <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑧">Relying Party</a> may decide to prompt the user to upgrade their account security and remove their password.</p>
+     <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑨">Relying Party</a> may decide to prompt the user to upgrade their account security and remove their password.</p>
     <li data-md>
      <p>Adding an additional factor after a state change:</p>
      <p>When the <code>BS</code> <a data-link-type="dfn" href="#flags" id="ref-for-flags②④">flag</a> changes from <code>1</code> to <code>0</code>, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③③">authenticator</a> is signaling that the <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①④">credential</a> is no longer backed up,
 and no longer protected from single device loss. This could be the result of the user actions, such as disabling the backup service, 
 or errors, such as issues with the backup service.</p>
-     <p>When this transition occurs, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑦⑨">Relying Party</a> SHOULD guide the user through a process to validate their other sign in factors.
+     <p>When this transition occurs, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⓪">Relying Party</a> SHOULD guide the user through a process to validate their other sign in factors.
 If the user does not have another credential for their account, they SHOULD be guided through adding an additional authentication factor 
 to ensure they do not lose access to their account. For example, the user could be prompted to set up an additional <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③④">authenticator</a>, 
 such as a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators⑧">roaming authenticator</a> or an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③⑤">authenticator</a> that is capable of <a data-link-type="dfn" href="#multi-device-credential" id="ref-for-multi-device-credential⑤">multi-device credentials</a>.</p>
@@ -4049,7 +4171,7 @@ <h3 class="heading settled" data-level="6.2" id="sctn-authenticator-taxonomy"><s
     <li data-md>
      <p>Whether the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①③⑨">authenticator</a> is a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①①">roaming</a> or <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators①⑤">platform</a> authenticator
 — the <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality①①">authenticator attachment modality</a>.
-A <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①②">roaming authenticator</a> can support one or more <a href="#enum-transport">transports</a> for communicating with the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⓪">client</a>.</p>
+A <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①②">roaming authenticator</a> can support one or more <a href="#enum-transport">transports</a> for communicating with the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑦">client</a>.</p>
     <li data-md>
      <p>Whether the authenticator is capable of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⓪">user verification</a> — the <a data-link-type="dfn" href="#authentication-factor-capability" id="ref-for-authentication-factor-capability">authentication factor capability</a>.</p>
     <li data-md>
@@ -4099,7 +4221,7 @@ <h3 class="heading settled" data-level="6.2" id="sctn-authenticator-taxonomy"><s
 these authenticators support <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③①">user verification</a> as a second <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af④">authentication factor</a>,
 typically a PIN or <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition③">biometric recognition</a>.
 The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⓪">authenticator</a> can thus act as two kinds of <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af⑤">authentication factor</a>,
-which enables <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af⑥">multi-factor</a> authentication while eliminating the need to share a password with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⓪">Relying Party</a>.</p>
+which enables <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af⑥">multi-factor</a> authentication while eliminating the need to share a password with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧①">Relying Party</a>.</p>
    <p>The four combinations not named in <a href="#table-authenticatorTypes">Table <span class="table-ref-previous"></span></a> have less distinguished use cases:</p>
    <ul>
     <li data-md>
@@ -4116,7 +4238,7 @@ <h3 class="heading settled" data-level="6.2" id="sctn-authenticator-taxonomy"><s
    </ul>
    <p>The following subsections define the aspects <a data-link-type="dfn" href="#authenticator-attachment-modality" id="ref-for-authenticator-attachment-modality①③">authenticator attachment modality</a>, <a data-link-type="dfn" href="#credential-storage-modality" id="ref-for-credential-storage-modality③">credential storage modality</a> and <a data-link-type="dfn" href="#authentication-factor-capability" id="ref-for-authentication-factor-capability②">authentication factor capability</a> in more depth.</p>
    <h4 class="heading settled" data-level="6.2.1" id="sctn-authenticator-attachment-modality"><span class="secno">6.2.1. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-attachment-modality">Authenticator Attachment Modality</dfn></span><a class="self-link" href="#sctn-authenticator-attachment-modality"></a></h4>
-   <p><a data-link-type="dfn" href="#client" id="ref-for-client⑥①">Clients</a> can communicate with <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④②">authenticators</a> using a variety of mechanisms. For example, a <a data-link-type="dfn" href="#client" id="ref-for-client⑥②">client</a> MAY use a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device②⑨">client device</a>-specific API to communicate with an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④③">authenticator</a> which is physically bound to a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⓪">client device</a>. On the other hand, a <a data-link-type="dfn" href="#client" id="ref-for-client⑥③">client</a> can use a variety of standardized cross-platform transport protocols such as Bluetooth (see <a href="#enum-transport">§ 5.8.4 Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>) to discover
+   <p><a data-link-type="dfn" href="#client" id="ref-for-client⑥⑧">Clients</a> can communicate with <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④②">authenticators</a> using a variety of mechanisms. For example, a <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑨">client</a> MAY use a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device②⑨">client device</a>-specific API to communicate with an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④③">authenticator</a> which is physically bound to a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⓪">client device</a>. On the other hand, a <a data-link-type="dfn" href="#client" id="ref-for-client⑦⓪">client</a> can use a variety of standardized cross-platform transport protocols such as Bluetooth (see <a href="#enum-transport">§ 5.8.4 Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>) to discover
 and communicate with <a data-link-type="dfn" href="#cross-platform-attachment" id="ref-for-cross-platform-attachment④">cross-platform attached</a> <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④④">authenticators</a>. We refer to <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⑤">authenticators</a> that
 are part of the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③①">client device</a> as <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="platform-authenticators">platform authenticators</dfn>, while those that are reachable via cross-platform
 transport protocols are referred to as <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="roaming-authenticators">roaming authenticators</dfn>.</p>
@@ -4131,8 +4253,8 @@ <h4 class="heading settled" data-level="6.2.1" id="sctn-authenticator-attachment
    </ul>
    <p>Some <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②⓪">platform authenticators</a> could possibly also act as <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①⑧">roaming authenticators</a> depending on context. For example, a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②①">platform authenticator</a> integrated into a mobile device could make itself available as a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators①⑨">roaming authenticator</a> via
 Bluetooth.
-In this case <a data-link-type="dfn" href="#client" id="ref-for-client⑥④">clients</a> running on the mobile device would recognise the authenticator as a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②②">platform authenticator</a>,
-while <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑤">clients</a> running on a different <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⑤">client device</a> and communicating with the same authenticator via Bluetooth
+In this case <a data-link-type="dfn" href="#client" id="ref-for-client⑦①">clients</a> running on the mobile device would recognise the authenticator as a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②②">platform authenticator</a>,
+while <a data-link-type="dfn" href="#client" id="ref-for-client⑦②">clients</a> running on a different <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⑤">client device</a> and communicating with the same authenticator via Bluetooth
 would recognize it as a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⓪">roaming authenticator</a>.</p>
    <p>The primary use case for <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators②③">platform authenticators</a> is to register a particular <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⑥">client device</a> as a "trusted device",
 so the <a data-link-type="dfn" href="#client-device" id="ref-for-client-device③⑦">client device</a> itself acts as a <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af⑨">something you have</a> <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①⓪">authentication factor</a> for future <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①①">authentication</a>.
@@ -4149,12 +4271,12 @@ <h4 class="heading settled" data-level="6.2.2" id="sctn-credential-storage-modal
    <p>An <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⑧">authenticator</a> can store a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source③③">public key credential source</a> in one of two ways:</p>
    <ol>
     <li data-md>
-     <p>In persistent storage embedded in the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⑨">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑥">client</a> or <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④③">client device</a>, e.g., in a secure element.
+     <p>In persistent storage embedded in the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①④⑨">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑦③">client</a> or <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④③">client device</a>, e.g., in a secure element.
 This is a technical requirement for a <a data-link-type="dfn" href="#client-side-discoverable-public-key-credential-source" id="ref-for-client-side-discoverable-public-key-credential-source③">client-side discoverable public key credential source</a>.</p>
     <li data-md>
      <p>By encrypting (i.e., wrapping) the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①②">credential private key</a> such that only this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⓪">authenticator</a> can decrypt (i.e., unwrap) it and letting the resulting
-ciphertext be the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②②">credential ID</a> for the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source③④">public key credential source</a>. The <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②③">credential ID</a> is stored by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧①">Relying Party</a> and returned to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤①">authenticator</a> via the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①②">allowCredentials</a></code> option of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑥">get()</a></code>, which allows the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤②">authenticator</a> to decrypt and use the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①③">credential private key</a>.</p>
-     <p>This enables the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤③">authenticator</a> to have unlimited storage capacity for <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①④">credential private keys</a>, since the encrypted <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑤">credential private keys</a> are stored by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧②">Relying Party</a> instead of by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤④">authenticator</a> - but it means that a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑤">credential</a> stored in this way must be retrieved from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧③">Relying Party</a> before the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⑤">authenticator</a> can use it.</p>
+ciphertext be the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②②">credential ID</a> for the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source③④">public key credential source</a>. The <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②③">credential ID</a> is stored by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧②">Relying Party</a> and returned to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤①">authenticator</a> via the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①②">allowCredentials</a></code> option of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑦">get()</a></code>, which allows the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤②">authenticator</a> to decrypt and use the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①③">credential private key</a>.</p>
+     <p>This enables the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤③">authenticator</a> to have unlimited storage capacity for <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①④">credential private keys</a>, since the encrypted <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑤">credential private keys</a> are stored by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧③">Relying Party</a> instead of by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤④">authenticator</a> - but it means that a <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑤">credential</a> stored in this way must be retrieved from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧④">Relying Party</a> before the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⑤">authenticator</a> can use it.</p>
    </ol>
    <p>Which of these storage strategies an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⑥">authenticator</a> supports defines the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑤⑦">authenticator</a>'s <dfn class="dfn-paneled" data-dfn-type="dfn" data-lt="credential storage modality" data-noexport id="credential-storage-modality">credential storage
 modality</dfn> as follows:</p>
@@ -4168,7 +4290,7 @@ <h4 class="heading settled" data-level="6.2.2" id="sctn-credential-storage-modal
 modality</a>, i.e., it only supports storing <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑥">credential private keys</a> as a ciphertext in the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②④">credential ID</a>.</p>
    </ul>
    <p>Note that a <a data-link-type="dfn" href="#discoverable-credential-capable" id="ref-for-discoverable-credential-capable⑤">discoverable credential capable</a> <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥①">authenticator</a> MAY support both storage strategies. In this case, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥②">authenticator</a> MAY
-at its discretion use different storage strategies for different <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑥">credentials</a>, though subject to the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-residentkey" id="ref-for-dom-authenticatorselectioncriteria-residentkey⑥">residentKey</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-requireresidentkey" id="ref-for-dom-authenticatorselectioncriteria-requireresidentkey④">requireResidentKey</a></code> options of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②①">create()</a></code>.</p>
+at its discretion use different storage strategies for different <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑥">credentials</a>, though subject to the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-residentkey" id="ref-for-dom-authenticatorselectioncriteria-residentkey⑥">residentKey</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-authenticatorselectioncriteria-requireresidentkey" id="ref-for-dom-authenticatorselectioncriteria-requireresidentkey④">requireResidentKey</a></code> options of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②②">create()</a></code>.</p>
    <h4 class="heading settled" data-level="6.2.3" id="sctn-authentication-factor-capability"><span class="secno">6.2.3. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authentication-factor-capability">Authentication Factor Capability</dfn></span><a class="self-link" href="#sctn-authentication-factor-capability"></a></h4>
    <p>There are three broad classes of <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①①">authentication factors</a> that can be used to prove an identity during an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑥">authentication
 ceremony</a>: <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①②">something you have</a>, <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①③">something you know</a> and <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①④">something you are</a>. Examples include a physical key, a password,
@@ -4177,8 +4299,8 @@ <h4 class="heading settled" data-level="6.2.3" id="sctn-authentication-factor-ca
 verification</a> can also act as one or two additional kinds of <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①⑥">authentication factor</a>. For example, if the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥④">authenticator</a> can
 verify a PIN, the PIN is <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①⑦">something you know</a>, and a <a data-link-type="dfn" href="#biometric-authenticator" id="ref-for-biometric-authenticator">biometric authenticator</a> can verify <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①⑧">something you are</a>. Therefore, an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑤">authenticator</a> that supports <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③③">user verification</a> is <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="multi-factor-capable">multi-factor capable</dfn>. Conversely, an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑥">authenticator</a> that is
 not <a data-link-type="dfn" href="#multi-factor-capable" id="ref-for-multi-factor-capable④">multi-factor capable</a> is <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="single-factor-capable">single-factor capable</dfn>. Note that a single <a data-link-type="dfn" href="#multi-factor-capable" id="ref-for-multi-factor-capable⑤">multi-factor capable</a> <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑦">authenticator</a> could support several modes of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③④">user verification</a>, meaning it could act as all three kinds of <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af①⑨">authentication factor</a>.</p>
-   <p>Although <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑤">user verification</a> is performed locally on the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑧">authenticator</a> and not by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧④">Relying Party</a>, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑨">authenticator</a> indicates if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑥">user verification</a> was performed by setting the <a data-link-type="dfn" href="#uv" id="ref-for-uv③">UV</a> <a data-link-type="dfn" href="#flags" id="ref-for-flags②⑤">flag</a> in the signed response returned to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑤">Relying Party</a>.
-The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑥">Relying Party</a> can therefore use the <a data-link-type="dfn" href="#uv" id="ref-for-uv④">UV</a> flag to verify that additional <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②⓪">authentication factors</a> were used in a <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑤">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑦">authentication ceremony</a>. The authenticity of the <a data-link-type="dfn" href="#uv" id="ref-for-uv⑤">UV</a> <a data-link-type="dfn" href="#flags" id="ref-for-flags②⑥">flag</a> can in turn be assessed by inspecting the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⓪">authenticator</a>'s <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑥">attestation statement</a>.</p>
+   <p>Although <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑤">user verification</a> is performed locally on the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑧">authenticator</a> and not by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑤">Relying Party</a>, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑥⑨">authenticator</a> indicates if <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification③⑥">user verification</a> was performed by setting the <a data-link-type="dfn" href="#uv" id="ref-for-uv③">UV</a> <a data-link-type="dfn" href="#flags" id="ref-for-flags②⑤">flag</a> in the signed response returned to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑥">Relying Party</a>.
+The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑦">Relying Party</a> can therefore use the <a data-link-type="dfn" href="#uv" id="ref-for-uv④">UV</a> flag to verify that additional <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②⓪">authentication factors</a> were used in a <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑤">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑦">authentication ceremony</a>. The authenticity of the <a data-link-type="dfn" href="#uv" id="ref-for-uv⑤">UV</a> <a data-link-type="dfn" href="#flags" id="ref-for-flags②⑥">flag</a> can in turn be assessed by inspecting the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⓪">authenticator</a>'s <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑥">attestation statement</a>.</p>
    <h3 class="heading settled" data-level="6.3" id="sctn-authenticator-ops"><span class="secno">6.3. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-operations">Authenticator Operations</dfn></span><a class="self-link" href="#sctn-authenticator-ops"></a></h3>
    <p>A <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑥">WebAuthn Client</a> MUST connect to an authenticator in order to invoke any of the operations of that authenticator. This connection
 defines an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-session">authenticator session</dfn>. An authenticator must maintain isolation between sessions. It may do this by only allowing one
@@ -4212,13 +4334,13 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
      <p>The <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data⑧">hash of the serialized client data</a>, provided by the client.</p>
     <dt data-md><var>rpEntity</var>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑦">Relying Party</a>'s <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity⑤">PublicKeyCredentialRpEntity</a></code>.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑧">Relying Party</a>'s <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrpentity" id="ref-for-dictdef-publickeycredentialrpentity⑥">PublicKeyCredentialRpEntity</a></code>.</p>
     <dt data-md><var>userEntity</var>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑧">user account’s</a> <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑤">PublicKeyCredentialUserEntity</a></code>, containing the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle①⑨">user handle</a> given by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑧">Relying Party</a>.</p>
+     <p>The <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑧">user account’s</a> <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑤">PublicKeyCredentialUserEntity</a></code>, containing the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle①⑨">user handle</a> given by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑨">Relying Party</a>.</p>
     <dt data-md><var>requireResidentKey</var>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#effective-resident-key-requirement-for-credential-creation" id="ref-for-effective-resident-key-requirement-for-credential-creation">effective resident key requirement for credential creation</a>, a Boolean value determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑦">client</a>.</p>
+     <p>The <a data-link-type="dfn" href="#effective-resident-key-requirement-for-credential-creation" id="ref-for-effective-resident-key-requirement-for-credential-creation">effective resident key requirement for credential creation</a>, a Boolean value determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦④">client</a>.</p>
     <dt data-md><var>requireUserPresence</var>
     <dd data-md>
      <p>The constant Boolean value <code>true</code>.
@@ -4226,14 +4348,14 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
 wish to make a <a data-link-type="dfn" href="#test-of-user-presence" id="ref-for-test-of-user-presence⑧">test of user presence</a> optional although WebAuthn does not.</p>
     <dt data-md><var>requireUserVerification</var>
     <dd data-md>
-     <p>The <a data-link-type="dfn" href="#effective-user-verification-requirement-for-credential-creation" id="ref-for-effective-user-verification-requirement-for-credential-creation">effective user verification requirement for credential creation</a>, a Boolean value determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑧">client</a>.</p>
+     <p>The <a data-link-type="dfn" href="#effective-user-verification-requirement-for-credential-creation" id="ref-for-effective-user-verification-requirement-for-credential-creation">effective user verification requirement for credential creation</a>, a Boolean value determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑤">client</a>.</p>
     <dt data-md><var>credTypesAndPubKeyAlgs</var>
     <dd data-md>
-     <p>A sequence of pairs of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype⑧">PublicKeyCredentialType</a></code> and public key algorithms (<code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①⓪">COSEAlgorithmIdentifier</a></code>) requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑧⑨">Relying Party</a>. This sequence is ordered from most preferred to least preferred. The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦②">authenticator</a> makes a best-effort to create the most
+     <p>A sequence of pairs of <code class="idl"><a data-link-type="idl" href="#enumdef-publickeycredentialtype" id="ref-for-enumdef-publickeycredentialtype⑧">PublicKeyCredentialType</a></code> and public key algorithms (<code class="idl"><a data-link-type="idl" href="#typedefdef-cosealgorithmidentifier" id="ref-for-typedefdef-cosealgorithmidentifier①⓪">COSEAlgorithmIdentifier</a></code>) requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⓪">Relying Party</a>. This sequence is ordered from most preferred to least preferred. The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦②">authenticator</a> makes a best-effort to create the most
 preferred credential that it can.</p>
     <dt data-md><var>excludeCredentialDescriptorList</var>
     <dd data-md>
-     <p>An OPTIONAL list of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①⓪">PublicKeyCredentialDescriptor</a></code> objects provided by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⓪">Relying Party</a> with the intention that, if any of
+     <p>An OPTIONAL list of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①⓪">PublicKeyCredentialDescriptor</a></code> objects provided by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨①">Relying Party</a> with the intention that, if any of
 these are known to the authenticator, it SHOULD NOT create a new credential. <var>excludeCredentialDescriptorList</var> contains a
 list of known credentials.</p>
     <dt data-md><var>enterpriseAttestationPossible</var>
@@ -4241,8 +4363,8 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
      <p>A Boolean value that indicates that individually-identifying attestation MAY be returned by the authenticator.</p>
     <dt data-md><var>extensions</var>
     <dd data-md>
-     <p>A <a data-link-type="dfn" href="#cbor" id="ref-for-cbor⑨">CBOR</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map⑦">map</a> from <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier④">extension identifiers</a> to their <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①">authenticator extension inputs</a>, created by the <a data-link-type="dfn" href="#client" id="ref-for-client⑥⑨">client</a> based on
-the extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨①">Relying Party</a>, if any.</p>
+     <p>A <a data-link-type="dfn" href="#cbor" id="ref-for-cbor⑨">CBOR</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map⑦">map</a> from <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier④">extension identifiers</a> to their <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①">authenticator extension inputs</a>, created by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑥">client</a> based on
+the extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨②">Relying Party</a>, if any.</p>
    </dl>
    <p class="note" role="note"><span>Note:</span> Before performing this operation, all other operations in progress in the <a data-link-type="dfn" href="#authenticator-session" id="ref-for-authenticator-session②">authenticator session</a> MUST be aborted by
 running the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel①①">authenticatorCancel</a> operation.</p>
@@ -4273,7 +4395,7 @@ <h4 class="heading settled" data-level="6.3.2" id="sctn-op-make-cred"><span clas
        </dl>
        <p class="note" role="note"><span>Note:</span> The purpose of this <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture①⑨">authorization gesture</a> is not to proceed with creating a credential,
 but for privacy reasons to authorize disclosure of the fact that <code><var>descriptor</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id③">id</a></code></code> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①③">bound</a> to this <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦④">authenticator</a>.
-If the user consents, the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⓪">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨②">Relying Party</a> can detect this and guide the user to use a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⑤">authenticator</a>.
+If the user consents, the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑦">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨③">Relying Party</a> can detect this and guide the user to use a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⑤">authenticator</a>.
 If the user does not consent,
 the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⑥">authenticator</a> does not reveal that <code><var>descriptor</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id④">id</a></code></code> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①④">bound</a> to it,
 and responds as if the user simply declined consent to create a credential.</p>
@@ -4381,7 +4503,7 @@ <h4 class="heading settled" data-level="6.3.3" id="sctn-op-get-assertion"><span
      <p>The <a data-link-type="dfn" href="#collectedclientdata-hash-of-the-serialized-client-data" id="ref-for-collectedclientdata-hash-of-the-serialized-client-data⑨">hash of the serialized client data</a>, provided by the client.</p>
     <dt data-md><var>allowCredentialDescriptorList</var>
     <dd data-md>
-     <p>An OPTIONAL <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list③">list</a> of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①①">PublicKeyCredentialDescriptor</a></code>s describing credentials acceptable to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨③">Relying Party</a> (possibly filtered
+     <p>An OPTIONAL <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list③">list</a> of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialdescriptor" id="ref-for-dictdef-publickeycredentialdescriptor①①">PublicKeyCredentialDescriptor</a></code>s describing credentials acceptable to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨④">Relying Party</a> (possibly filtered
 by the client), if any.</p>
     <dt data-md><var>requireUserPresence</var>
     <dd data-md>
@@ -4394,7 +4516,7 @@ <h4 class="heading settled" data-level="6.3.3" id="sctn-op-get-assertion"><span
     <dt data-md><var>extensions</var>
     <dd data-md>
      <p>A <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⓪">CBOR</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map⑧">map</a> from <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier⑥">extension identifiers</a> to their <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input③">authenticator extension inputs</a>, created by the client based on
-the extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨④">Relying Party</a>, if any.</p>
+the extensions requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑤">Relying Party</a>, if any.</p>
    </dl>
    <p class="note" role="note"><span>Note:</span> Before performing this operation, all other operations in progress in the <a data-link-type="dfn" href="#authenticator-session" id="ref-for-authenticator-session③">authenticator session</a> MUST be aborted by running the <a data-link-type="dfn" href="#authenticatorcancel" id="ref-for-authenticatorcancel①②">authenticatorCancel</a> operation.</p>
    <p>When this method is invoked, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑦⑧">authenticator</a> MUST perform the following procedure:</p>
@@ -4470,7 +4592,7 @@ <h4 class="heading settled" data-level="6.3.3" id="sctn-op-get-assertion"><span
        <p class="note" role="note"><span>Note:</span> the returned <a data-link-type="dfn" href="#public-key-credential-source-userhandle" id="ref-for-public-key-credential-source-userhandle③">userHandle</a> value may be <code>null</code>, see: <a data-link-type="dfn" href="#assertioncreationdata-userhandleresult" id="ref-for-assertioncreationdata-userhandleresult④">userHandleResult</a>.</p>
      </ul>
    </ol>
-   <p>If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧②">authenticator</a> cannot find any <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑦">credential</a> corresponding to the specified <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑤">Relying Party</a> that
+   <p>If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧②">authenticator</a> cannot find any <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑦">credential</a> corresponding to the specified <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑥">Relying Party</a> that
 matches the specified criteria, it terminates the operation and returns an error.</p>
    <h4 class="heading settled" data-level="6.3.4" id="sctn-op-cancel"><span class="secno">6.3.4. </span><span class="content">The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticatorcancel">authenticatorCancel</dfn> Operation</span><a class="self-link" href="#sctn-op-cancel"></a></h4>
    <p>This operation takes no input parameters and returns no result.</p>
@@ -4479,7 +4601,7 @@ <h4 class="heading settled" data-level="6.3.4" id="sctn-op-cancel"><span class="
 client ignores any further responses from the authenticator for the canceled operation.</p>
    <p>This operation is ignored if it is invoked in an <a data-link-type="dfn" href="#authenticator-session" id="ref-for-authenticator-session⑤">authenticator session</a> which does not have an <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①⑤">authenticatorMakeCredential</a> or <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⑤">authenticatorGetAssertion</a> operation currently in progress.</p>
    <h3 class="heading settled" data-level="6.4" id="sctn-strings"><span class="secno">6.4. </span><span class="content">String Handling</span><a class="self-link" href="#sctn-strings"></a></h3>
-   <p>Authenticators may be required to store arbitrary strings chosen by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑥">Relying Party</a>, for example the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①③">name</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname①②">displayName</a></code> in a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑥">PublicKeyCredentialUserEntity</a></code>. This section discusses some practical consequences of handling arbitrary strings that may be presented to humans.</p>
+   <p>Authenticators may be required to store arbitrary strings chosen by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑦">Relying Party</a>, for example the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialentity-name" id="ref-for-dom-publickeycredentialentity-name①③">name</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-displayname" id="ref-for-dom-publickeycredentialuserentity-displayname①②">displayName</a></code> in a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑥">PublicKeyCredentialUserEntity</a></code>. This section discusses some practical consequences of handling arbitrary strings that may be presented to humans.</p>
    <h4 class="heading settled" data-level="6.4.1" id="sctn-strings-truncation"><span class="secno">6.4.1. </span><span class="content">String Truncation</span><a class="self-link" href="#sctn-strings-truncation"></a></h4>
    <p>Each arbitrary string in the API will have some accommodation for the potentially limited resources available to an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧③">authenticator</a>. If string value truncation is the chosen accommodation then authenticators MAY truncate in order to make the string fit within a length equal or greater than the specified minimum supported length. Such truncation SHOULD also respect UTF-8 sequence boundaries or <a data-link-type="dfn" href="https://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries" id="ref-for-Grapheme_Cluster_Boundaries">grapheme cluster</a> boundaries <a data-link-type="biblio" href="#biblio-utr29">[UTR29]</a>. This defines the maximum truncation permitted and authenticators MUST NOT truncate further.</p>
    <p>For example, in <a href="#fig-stringTruncation">figure <span class="figure-num-following"></span></a> the string is 65 bytes long. If truncating to 64 bytes then the final 0x88 byte must be removed purely because of space reasons. Since that leaves a partial UTF-8 sequence the remainder of that sequence may also be removed. Since that leaves a partial <a data-link-type="dfn" href="https://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries" id="ref-for-Grapheme_Cluster_Boundaries①">grapheme cluster</a> an authenticator may remove the remainder of that cluster.</p>
@@ -4487,7 +4609,7 @@ <h4 class="heading settled" data-level="6.4.1" id="sctn-strings-truncation"><spa
      <img src="images/string-truncation.svg"> 
     <figcaption>The end of a UTF-8 encoded string showing the positions of different truncation boundaries.</figcaption>
    </figure>
-   <p><a data-link-type="dfn" href="#conforming-user-agent" id="ref-for-conforming-user-agent④">Conforming User Agents</a> are responsible for ensuring that the authenticator behavior observed by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑦">Relying Parties</a> conforms to this specification with respect to string handling. For example, if an authenticator is known to behave incorrectly when asked to store large strings, the user agent SHOULD perform the truncation for it in order to maintain the model from the point of view of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑧">Relying Party</a>. User-agents that do this SHOULD truncate at <a data-link-type="dfn" href="https://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries" id="ref-for-Grapheme_Cluster_Boundaries②">grapheme cluster</a> boundaries.</p>
+   <p><a data-link-type="dfn" href="#conforming-user-agent" id="ref-for-conforming-user-agent④">Conforming User Agents</a> are responsible for ensuring that the authenticator behavior observed by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑧">Relying Parties</a> conforms to this specification with respect to string handling. For example, if an authenticator is known to behave incorrectly when asked to store large strings, the user agent SHOULD perform the truncation for it in order to maintain the model from the point of view of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑨">Relying Party</a>. User-agents that do this SHOULD truncate at <a data-link-type="dfn" href="https://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries" id="ref-for-Grapheme_Cluster_Boundaries②">grapheme cluster</a> boundaries.</p>
    <p>Truncation based on UTF-8 sequences alone may cause a <a data-link-type="dfn" href="https://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries" id="ref-for-Grapheme_Cluster_Boundaries③">grapheme cluster</a> to be truncated. This could make the grapheme cluster render as a different glyph, potentially changing the meaning of the string, instead of removing the glyph entirely.</p>
    <p>In addition to that, truncating on byte boundaries alone causes a known issue that user agents should be aware of: if the authenticator is using <a data-link-type="biblio" href="#biblio-fido-ctap">[FIDO-CTAP]</a> then future messages from the authenticator may contain invalid CBOR since the value is typed as a CBOR string and thus is required to be valid UTF-8. User agents are tasked with handling this to avoid burdening authenticators with understanding character encodings and Unicode character properties. Thus, when dealing with <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧④">authenticators</a>, user agents SHOULD:</p>
    <ol>
@@ -4512,15 +4634,15 @@ <h4 class="heading settled" data-level="6.4.2" id="sctn-strings-langdir"><span c
    <h3 class="heading settled" data-level="6.5" id="sctn-attestation"><span class="secno">6.5. </span><span class="content">Attestation</span><a class="self-link" href="#sctn-attestation"></a></h3>
    <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑥">Authenticators</a> SHOULD also provide some form of <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①①">attestation</a>, if possible.
 If an authenticator does, the basic requirement is that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑦">authenticator</a> can
-produce, for each <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②③">credential public key</a>, an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑦">attestation statement</a> verifiable by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑤">WebAuthn Relying Party</a>. Typically, this <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑧">attestation statement</a> contains a signature by an <a data-link-type="dfn" href="#attestation-private-key" id="ref-for-attestation-private-key①">attestation private key</a> over the attested <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②④">credential public key</a> and
+produce, for each <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②③">credential public key</a>, an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑦">attestation statement</a> verifiable by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑦">WebAuthn Relying Party</a>. Typically, this <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑧">attestation statement</a> contains a signature by an <a data-link-type="dfn" href="#attestation-private-key" id="ref-for-attestation-private-key①">attestation private key</a> over the attested <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②④">credential public key</a> and
 a challenge, as well as a certificate or similar data providing provenance information for the <a data-link-type="dfn" href="#attestation-public-key" id="ref-for-attestation-public-key">attestation public key</a>,
-enabling the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party①⑨⑨">Relying Party</a> to make a trust decision. However, if an <a data-link-type="dfn" href="#attestation-key-pair" id="ref-for-attestation-key-pair②">attestation key pair</a> is not available, then the authenticator
+enabling the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⓪">Relying Party</a> to make a trust decision. However, if an <a data-link-type="dfn" href="#attestation-key-pair" id="ref-for-attestation-key-pair②">attestation key pair</a> is not available, then the authenticator
 MAY either perform <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑦">self attestation</a> of the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑤">credential public key</a> with the corresponding <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑦">credential private key</a>,
 or otherwise perform <a data-link-type="dfn" href="#none" id="ref-for-none①">no attestation</a>. All this
 information is returned by <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑧">authenticators</a> any time a new <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑧">public key credential</a> is generated, in the overall form of an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attestation-object">attestation object</dfn>. The relationship of the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⓪">attestation object</a> with <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③⑦">authenticator data</a> (containing <a data-link-type="dfn" href="#attested-credential-data" id="ref-for-attested-credential-data⑨">attested credential data</a>) and the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement①⑨">attestation statement</a> is illustrated in <a href="#fig-attStructs">figure <span class="figure-num-following"></span></a>, below.</p>
    <p>If an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑧⑨">authenticator</a> employs <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑧">self attestation</a> or <a data-link-type="dfn" href="#none" id="ref-for-none②">no attestation</a>, then no provenance information is provided
-for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⓪">Relying Party</a> to base a trust decision on.
-In these cases, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⓪">authenticator</a> provides no guarantees about its operation to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪①">Relying Party</a>.</p>
+for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪①">Relying Party</a> to base a trust decision on.
+In these cases, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⓪">authenticator</a> provides no guarantees about its operation to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪②">Relying Party</a>.</p>
    <figure id="fig-attStructs">
      <img src="images/fido-attestation-structures.svg"> 
     <figcaption><a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①①">Attestation object</a> layout illustrating the included <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③⑧">authenticator data</a> (containing <a data-link-type="dfn" href="#attested-credential-data" id="ref-for-attested-credential-data①⓪">attested credential
@@ -4532,7 +4654,7 @@ <h3 class="heading settled" data-level="6.5" id="sctn-attestation"><span class="
 data object, containing statements about a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential④⑨">public key credential</a> itself and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨①">authenticator</a> that created it. It
 contains an <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature⑥">attestation signature</a> created using the key of the attesting authority (except for the case of <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation⑨">self
 attestation</a>, when it is created using the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key①⑧">credential private key</a>). In order to correctly interpret an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②①">attestation
-statement</a>, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪②">Relying Party</a> needs to understand these two aspects of <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①②">attestation</a>:</p>
+statement</a>, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪③">Relying Party</a> needs to understand these two aspects of <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①②">attestation</a>:</p>
    <ol>
     <li data-md>
      <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attestation-statement-format">attestation statement format</dfn> is the manner in which the signature is represented and the various contextual
@@ -4540,7 +4662,7 @@ <h3 class="heading settled" data-level="6.5" id="sctn-attestation"><span class="
 syntax of the statement. Various existing components and OS platforms (such as TPMs and the Android OS) have previously defined <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format④">attestation statement formats</a>. This specification supports a variety of such formats in an extensible way, as defined in <a href="#sctn-attestation-formats">§ 6.5.2 Attestation Statement Formats</a>. The formats themselves are identified by strings, as described in <a href="#sctn-attstn-fmt-ids">§ 8.1 Attestation Statement Format Identifiers</a>.</p>
     <li data-md>
      <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attestation-type">attestation type</dfn> defines the semantics of <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②②">attestation statements</a> and their underlying trust models.
-Specifically, it defines how a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪③">Relying Party</a> establishes trust in a particular <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②③">attestation statement</a>, after verifying that it
+Specifically, it defines how a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪④">Relying Party</a> establishes trust in a particular <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②③">attestation statement</a>, after verifying that it
 is cryptographically valid. This specification supports a number of <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type">attestation types</a>, as described in <a href="#sctn-attestation-types">§ 6.5.3 Attestation Types</a>.</p>
    </ol>
    <p>In general, there is no simple mapping between <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format⑤">attestation statement formats</a> and <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①">attestation types</a>. For example, the
@@ -4557,9 +4679,9 @@ <h3 class="heading settled" data-level="6.5" id="sctn-attestation"><span class="
      <p>The characteristics of the individual <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨③">authenticator</a>, such as its construction, whether part or all of it runs in a secure
 operating environment, and so on.</p>
    </ul>
-   <p>The <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type④">attestation type</a> and <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format⑧">attestation statement format</a> is chosen by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨④">authenticator</a>; <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪④">Relying Parties</a> can only signal limited <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance③">attestation conveyance</a> preferences during <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑥">registration</a>.
+   <p>The <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type④">attestation type</a> and <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format⑧">attestation statement format</a> is chosen by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨④">authenticator</a>; <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑤">Relying Parties</a> can only signal limited <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance③">attestation conveyance</a> preferences during <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑥">registration</a>.
 It is expected that most <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑤">authenticators</a> will support a small number of <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type⑤">attestation types</a> and <a data-link-type="dfn" href="#attestation-statement-format" id="ref-for-attestation-statement-format⑨">attestation statement
-formats</a>, while <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑤">Relying Parties</a> will decide what <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type⑥">attestation types</a> are acceptable to them by policy. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑥">Relying Parties</a> will also need to
+formats</a>, while <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑥">Relying Parties</a> will decide what <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type⑥">attestation types</a> are acceptable to them by policy. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑦">Relying Parties</a> will also need to
 understand the characteristics of the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑥">authenticators</a> that they trust, based on information they have about these <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑦">authenticators</a>. For example, the FIDO Metadata Service <a data-link-type="biblio" href="#biblio-fidometadataservice">[FIDOMetadataService]</a> provides one way to access such information.</p>
    <h4 class="heading settled" data-level="6.5.1" id="sctn-attested-credential-data"><span class="secno">6.5.1. </span><span class="content">Attested Credential Data</span><a class="self-link" href="#sctn-attested-credential-data"></a></h4>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="attested-credential-data">Attested credential data</dfn> is a variable-length byte array added to the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data③⑨">authenticator data</a> when generating an <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①③">attestation
@@ -4689,12 +4811,12 @@ <h4 class="heading settled" data-level="6.5.2" id="sctn-attestation-formats"><sp
    <h4 class="heading settled" data-level="6.5.3" id="sctn-attestation-types"><span class="secno">6.5.3. </span><span class="content">Attestation Types</span><a class="self-link" href="#sctn-attestation-types"></a></h4>
    <p>WebAuthn supports several <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type⑨">attestation types</a>, defining the semantics of <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement②⑨">attestation statements</a> and their underlying trust
 models:</p>
-   <p class="note" role="note"><span>Note:</span> This specification does not define any data structures explicitly expressing the <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⓪">attestation types</a> employed by <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑨">authenticators</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑦">Relying Parties</a> engaging in <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⓪">attestation statement</a> <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure">verification</a> — i.e., when
-calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②②">navigator.credentials.create()</a></code> they select an <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance④">attestation conveyance</a> other than <code class="idl"><a data-link-type="idl" href="#dom-attestationconveyancepreference-none" id="ref-for-dom-attestationconveyancepreference-none③">none</a></code> and verify the received <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③①">attestation statement</a> — will determine the employed <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①①">attestation type</a> as a part of <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①">verification</a>. See the "Verification procedure" subsections of <a href="#sctn-defined-attestation-formats">§ 8 Defined Attestation Statement Formats</a>. See also <a href="#sctn-attestation-privacy">§ 14.4.1 Attestation Privacy</a>. For all <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①②">attestation types</a> defined in this
-section other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①①">Self</a> and <a data-link-type="dfn" href="#none" id="ref-for-none③">None</a>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑧">Relying Party</a> <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure②">verification</a> is followed by
+   <p class="note" role="note"><span>Note:</span> This specification does not define any data structures explicitly expressing the <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⓪">attestation types</a> employed by <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator①⑨⑨">authenticators</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑧">Relying Parties</a> engaging in <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⓪">attestation statement</a> <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure">verification</a> — i.e., when
+calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②③">navigator.credentials.create()</a></code> they select an <a data-link-type="dfn" href="#attestation-conveyance" id="ref-for-attestation-conveyance④">attestation conveyance</a> other than <code class="idl"><a data-link-type="idl" href="#dom-attestationconveyancepreference-none" id="ref-for-dom-attestationconveyancepreference-none③">none</a></code> and verify the received <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③①">attestation statement</a> — will determine the employed <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①①">attestation type</a> as a part of <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure①">verification</a>. See the "Verification procedure" subsections of <a href="#sctn-defined-attestation-formats">§ 8 Defined Attestation Statement Formats</a>. See also <a href="#sctn-attestation-privacy">§ 14.4.1 Attestation Privacy</a>. For all <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①②">attestation types</a> defined in this
+section other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①①">Self</a> and <a data-link-type="dfn" href="#none" id="ref-for-none③">None</a>, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑨">Relying Party</a> <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure②">verification</a> is followed by
 matching the <a data-link-type="dfn" href="#attestation-trust-path" id="ref-for-attestation-trust-path①">trust path</a> to an acceptable root certificate per step 20 of <a href="#sctn-registering-a-new-credential">§ 7.1 Registering a New Credential</a>.
 Differentiating these <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①③">attestation types</a> becomes useful primarily as a means for determining if the <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①⑤">attestation</a> is acceptable
-under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⓪⑨">Relying Party</a> policy.</p>
+under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⓪">Relying Party</a> policy.</p>
    <dl>
     <dt data-md><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="basic-attestation">Basic Attestation</dfn> (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="basic">Basic</dfn>)
     <dd data-md>
@@ -4712,12 +4834,12 @@ <h4 class="heading settled" data-level="6.5.3" id="sctn-attestation-types"><span
 "endorsement key" (EK). This key is used to securely communicate with a trusted third party, the <a data-link-type="dfn" href="#attestation-ca" id="ref-for-attestation-ca①">Attestation CA</a> <a data-link-type="biblio" href="#biblio-tcg-cmcprofile-aikcertenroll">[TCG-CMCProfile-AIKCertEnroll]</a> (formerly known as a "Privacy CA"). The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪①">authenticator</a> can generate multiple
 attestation identity key pairs (AIK) and requests an <a data-link-type="dfn" href="#attestation-ca" id="ref-for-attestation-ca②">Attestation CA</a> to issue an AIK certificate
 for each. Using this approach, such an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪②">authenticator</a> can limit the exposure of the EK (which is a global correlation
-handle) to Attestation CA(s). AIKs can be requested for each <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪③">authenticator</a>-generated <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤①">public key credential</a> individually, and conveyed to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⓪">Relying Parties</a> as <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate③">attestation certificates</a>.</p>
+handle) to Attestation CA(s). AIKs can be requested for each <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪③">authenticator</a>-generated <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤①">public key credential</a> individually, and conveyed to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①①">Relying Parties</a> as <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate③">attestation certificates</a>.</p>
      <p class="note" role="note"><span>Note:</span> This concept typically leads to multiple attestation certificates. The attestation certificate requested most recently
     is called "active".</p>
     <dt data-md><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="anonymization-ca">Anonymization CA</dfn> (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="anonca">AnonCA</dfn>)
     <dd data-md>
-     <p>In this case, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪④">authenticator</a> uses an <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca③">Anonymization CA</a> which dynamically generates per-<a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑥">credential</a> <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate④">attestation certificates</a> such that the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③②">attestation statements</a> presented to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①①">Relying Parties</a> do not provide uniquely identifiable information, e.g., that might be used for tracking purposes.</p>
+     <p>In this case, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪④">authenticator</a> uses an <a data-link-type="dfn" href="#anonymization-ca" id="ref-for-anonymization-ca③">Anonymization CA</a> which dynamically generates per-<a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑥">credential</a> <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate④">attestation certificates</a> such that the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③②">attestation statements</a> presented to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①②">Relying Parties</a> do not provide uniquely identifiable information, e.g., that might be used for tracking purposes.</p>
      <p class="note" role="note"><span>Note:</span> <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③③">Attestation statements</a> conveying <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①⑥">attestations</a> of <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①④">type</a> <a data-link-type="dfn" href="#attca" id="ref-for-attca">AttCA</a> or <a data-link-type="dfn" href="#anonca" id="ref-for-anonca">AnonCA</a> use the same data structure
     as those of <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⑤">type</a> <a data-link-type="dfn" href="#basic" id="ref-for-basic">Basic</a>, so the three attestation types
     are, in general, distinguishable only with externally provided knowledge regarding the contents of the <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate⑤">attestation
@@ -4791,20 +4913,20 @@ <h4 class="heading settled" data-level="6.5.5" id="sctn-signature-attestation-ty
 RSASSA-PSS signature scheme defined in section 8.1.1 in <a data-link-type="biblio" href="#biblio-rfc8017">[RFC8017]</a> with SHA-256 as the hash function.
 The signature is not ASN.1 wrapped.</p>
    </ul>
-   <h2 class="heading settled" data-level="7" id="sctn-rp-operations"><span class="secno">7. </span><span class="content"><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑥">WebAuthn Relying Party</a> Operations</span><a class="self-link" href="#sctn-rp-operations"></a></h2>
-   <p>A <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑦">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑧">authentication ceremony</a> begins with the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑦">WebAuthn Relying Party</a> creating a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions④">PublicKeyCredentialCreationOptions</a></code> or <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑤">PublicKeyCredentialRequestOptions</a></code> object, respectively, which encodes the parameters for the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⓪">ceremony</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①②">Relying Party</a> SHOULD take care to not leak sensitive information during this stage; see <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a> for details.</p>
-   <p>Upon successful execution of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②③">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑦">get()</a></code>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①③">Relying Party</a>'s script receives
-a <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⓪">PublicKeyCredential</a></code> containing an <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse⑤">AuthenticatorAttestationResponse</a></code> or <code class="idl"><a data-link-type="idl" href="#authenticatorassertionresponse" id="ref-for-authenticatorassertionresponse⑥">AuthenticatorAssertionResponse</a></code> structure,
-respectively, from the client. It must then deliver the contents of this structure to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①④">Relying Party</a> server, using methods outside
-the scope of this specification. This section describes the operations that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑤">Relying Party</a> must perform upon receipt of these
+   <h2 class="heading settled" data-level="7" id="sctn-rp-operations"><span class="secno">7. </span><span class="content"><a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑧">WebAuthn Relying Party</a> Operations</span><a class="self-link" href="#sctn-rp-operations"></a></h2>
+   <p>A <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑦">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑧">authentication ceremony</a> begins with the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑨">WebAuthn Relying Party</a> creating a <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑧">PublicKeyCredentialCreationOptions</a></code> or <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑨">PublicKeyCredentialRequestOptions</a></code> object, respectively, which encodes the parameters for the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⓪">ceremony</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①③">Relying Party</a> SHOULD take care to not leak sensitive information during this stage; see <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a> for details.</p>
+   <p>Upon successful execution of <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②④">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑧">get()</a></code>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①④">Relying Party</a>'s script receives
+a <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②③">PublicKeyCredential</a></code> containing an <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse⑤">AuthenticatorAttestationResponse</a></code> or <code class="idl"><a data-link-type="idl" href="#authenticatorassertionresponse" id="ref-for-authenticatorassertionresponse⑥">AuthenticatorAssertionResponse</a></code> structure,
+respectively, from the client. It must then deliver the contents of this structure to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑤">Relying Party</a> server, using methods outside
+the scope of this specification. This section describes the operations that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑥">Relying Party</a> must perform upon receipt of these
 structures.</p>
    <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credential"><span class="secno">7.1. </span><span class="content">Registering a New Credential</span><a class="self-link" href="#sctn-registering-a-new-credential"></a></h3>
-   <p>In order to perform a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑧">registration ceremony</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑥">Relying Party</a> MUST proceed as follows:</p>
+   <p>In order to perform a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑧">registration ceremony</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑦">Relying Party</a> MUST proceed as follows:</p>
    <ol>
     <li data-md>
-     <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑤">PublicKeyCredentialCreationOptions</a></code> structure configured to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑦">Relying Party</a>'s needs for the ceremony.</p>
+     <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑨">PublicKeyCredentialCreationOptions</a></code> structure configured to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑧">Relying Party</a>'s needs for the ceremony.</p>
     <li data-md>
-     <p>Call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②④">navigator.credentials.create()</a></code> and pass <var>options</var> as the <code><code class="idl"><a data-link-type="idl" href="#dom-credentialcreationoptions-publickey" id="ref-for-dom-credentialcreationoptions-publickey④">publicKey</a></code></code> option.
+     <p>Call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑤">navigator.credentials.create()</a></code> and pass <var>options</var> as the <code><code class="idl"><a data-link-type="idl" href="#dom-credentialcreationoptions-publickey" id="ref-for-dom-credentialcreationoptions-publickey④">publicKey</a></code></code> option.
 Let <var>credential</var> be the result of the successfully resolved promise.
 If the promise is rejected, abort the ceremony with a user-visible error, or otherwise guide the user experience as
 might be determinable from the context available in the rejected promise. For example if the promise is rejected with
@@ -4814,7 +4936,7 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
      <p>Let <var>response</var> be <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response⑤">response</a></code></code>.
 If <var>response</var> is not an instance of <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse⑥">AuthenticatorAttestationResponse</a></code>, abort the ceremony with a user-visible error.</p>
     <li data-md>
-     <p>Let <var>clientExtensionResults</var> be the result of calling <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults①">getClientExtensionResults()</a></code></code>.</p>
+     <p>Let <var>clientExtensionResults</var> be the result of calling <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults②">getClientExtensionResults()</a></code></code>.</p>
     <li data-md>
      <p>Let <var>JSONtext</var> be the result of
 running <a data-link-type="dfn" href="https://encoding.spec.whatwg.org/#utf-8-decode" id="ref-for-utf-8-decode">UTF-8 decode</a> on the value of <code><var>response</var>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorresponse-clientdatajson" id="ref-for-dom-authenticatorresponse-clientdatajson⑥">clientDataJSON</a></code></code>.</p>
@@ -4831,34 +4953,34 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
      <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge⑥">challenge</a></code></code> equals
 the base64url encoding of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge②">challenge</a></code></code>.</p>
     <li data-md>
-     <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑦">origin</a></code></code> matches the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑧">Relying Party</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①③">origin</a>.</p>
+     <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑦">origin</a></code></code> matches the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑨">Relying Party</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①③">origin</a>.</p>
     <li data-md>
      <p>Let <var>hash</var> be the result of computing a hash over <code><var>response</var>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorresponse-clientdatajson" id="ref-for-dom-authenticatorresponse-clientdatajson⑦">clientDataJSON</a></code></code> using SHA-256.</p>
     <li data-md>
      <p>Perform CBOR decoding on the <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-attestationobject" id="ref-for-dom-authenticatorattestationresponse-attestationobject⑥">attestationObject</a></code> field of the <code class="idl"><a data-link-type="idl" href="#authenticatorattestationresponse" id="ref-for-authenticatorattestationresponse⑦">AuthenticatorAttestationResponse</a></code> structure to obtain the attestation statement format <var>fmt</var>, the <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④③">authenticator data</a> <var>authData</var>, and the attestation statement <var>attStmt</var>.</p>
     <li data-md>
-     <p>Verify that the <code><a data-link-type="dfn" href="#rpidhash" id="ref-for-rpidhash②">rpIdHash</a></code> in <var>authData</var> is the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑤">RP ID</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②①⑨">Relying Party</a>.</p>
+     <p>Verify that the <code><a data-link-type="dfn" href="#rpidhash" id="ref-for-rpidhash②">rpIdHash</a></code> in <var>authData</var> is the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑤">RP ID</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⓪">Relying Party</a>.</p>
     <li data-md>
      <p>Verify that the <a data-link-type="dfn" href="#concept-user-present" id="ref-for-concept-user-present④">User Present</a> bit of the <code><a data-link-type="dfn" href="#flags" id="ref-for-flags②⑦">flags</a></code> in <var>authData</var> is set.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⓪">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④①">user verification</a> for this registration,
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②①">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④①">user verification</a> for this registration,
 verify that the <a data-link-type="dfn" href="#concept-user-verified" id="ref-for-concept-user-verified④">User Verified</a> bit of the <code><a data-link-type="dfn" href="#flags" id="ref-for-flags②⑧">flags</a></code> in <var>authData</var> is set.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②①">Relying Party</a> uses the credential’s <a data-link-type="dfn" href="#backup-eligibility" id="ref-for-backup-eligibility③">backup eligibility</a> to inform its user experience flows and/or policies, evaluate the <a data-link-type="dfn" href="#backup-eligibility" id="ref-for-backup-eligibility④">backup eligibility</a> (BE) bit of the <code><a data-link-type="dfn" href="#flags" id="ref-for-flags②⑨">flags</a></code> in <var>authData</var>.</p>
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②②">Relying Party</a> uses the credential’s <a data-link-type="dfn" href="#backup-eligibility" id="ref-for-backup-eligibility③">backup eligibility</a> to inform its user experience flows and/or policies, evaluate the <a data-link-type="dfn" href="#backup-eligibility" id="ref-for-backup-eligibility④">backup eligibility</a> (BE) bit of the <code><a data-link-type="dfn" href="#flags" id="ref-for-flags②⑨">flags</a></code> in <var>authData</var>.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②②">Relying Party</a> uses the credential’s <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state③">backup state</a> to inform its user experience flows and/or policies, evaluate the <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state④">backup state</a> (BS)
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②③">Relying Party</a> uses the credential’s <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state③">backup state</a> to inform its user experience flows and/or policies, evaluate the <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state④">backup state</a> (BS)
 bit of the <code><a data-link-type="dfn" href="#flags" id="ref-for-flags③⓪">flags</a></code> in <var>authData</var>, and then store the value for evaluation in future <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony①⑨">authentication ceremonies</a>.</p>
     <li data-md>
      <p>Verify that the "alg" parameter in the <a data-link-type="dfn" href="#credentialpublickey" id="ref-for-credentialpublickey⑤">credential public key</a> in <var>authData</var> matches the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialparameters-alg" id="ref-for-dom-publickeycredentialparameters-alg②">alg</a></code> attribute of one of the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item⑨">items</a> in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-pubkeycredparams" id="ref-for-dom-publickeycredentialcreationoptions-pubkeycredparams④">pubKeyCredParams</a></code></code>.</p>
     <li data-md>
      <p>Verify that the values of the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑥">client extension outputs</a> in <var>clientExtensionResults</var> and the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output③">authenticator extension
-outputs</a> in the <code><a data-link-type="dfn" href="#authdataextensions" id="ref-for-authdataextensions⑦">extensions</a></code> in <var>authData</var> are as expected, considering the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input③">client
-extension input</a> values that were given in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions④">extensions</a></code></code> and any specific policy of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②③">Relying Party</a> regarding unsolicited extensions, i.e., those that were not specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑤">extensions</a></code></code>.
-In the general case, the meaning of "are as expected" is specific to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②④">Relying Party</a> and which extensions are in use.</p>
-     <p class="note" role="note"><span>Note:</span> <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④④">Client platforms</a> MAY enact local policy that sets additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension②">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension②">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output④">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑦">client extension outputs</a> that were not originally specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑥">extensions</a></code></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑤">Relying Parties</a> MUST be prepared to handle such
-situations, whether it be to ignore the unsolicited extensions or reject the attestation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑥">Relying Party</a> can make this
+outputs</a> in the <code><a data-link-type="dfn" href="#authdataextensions" id="ref-for-authdataextensions⑦">extensions</a></code> in <var>authData</var> are as expected, considering the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑤">client
+extension input</a> values that were given in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions④">extensions</a></code></code> and any specific policy of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②④">Relying Party</a> regarding unsolicited extensions, i.e., those that were not specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑤">extensions</a></code></code>.
+In the general case, the meaning of "are as expected" is specific to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑤">Relying Party</a> and which extensions are in use.</p>
+     <p class="note" role="note"><span>Note:</span> <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④④">Client platforms</a> MAY enact local policy that sets additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension②">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension②">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output④">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑦">client extension outputs</a> that were not originally specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑥">extensions</a></code></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑥">Relying Parties</a> MUST be prepared to handle such
+situations, whether it be to ignore the unsolicited extensions or reject the attestation. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑦">Relying Party</a> can make this
 decision based on local policy and the extensions in use.</p>
-     <p class="note" role="note"><span>Note:</span> Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑦①">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪⑨">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑦">Relying Party</a> MUST also be
+     <p class="note" role="note"><span>Note:</span> Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑧">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⓪⑨">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑧">Relying Party</a> MUST also be
 prepared to handle cases where none or not all of the requested extensions were acted upon.</p>
     <li data-md>
      <p>Determine the attestation statement format by performing a USASCII case-sensitive match on <var>fmt</var> against the set of
@@ -4878,23 +5000,23 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
      <p>Assess the attestation trustworthiness using the outputs of the <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure⑤">verification procedure</a> in step 19, as follows:</p>
      <ul>
       <li data-md>
-       <p>If <a data-link-type="dfn" href="#none" id="ref-for-none④">no attestation</a> was provided, verify that <a data-link-type="dfn" href="#none" id="ref-for-none⑤">None</a> attestation is acceptable under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑧">Relying Party</a> policy.</p>
+       <p>If <a data-link-type="dfn" href="#none" id="ref-for-none④">no attestation</a> was provided, verify that <a data-link-type="dfn" href="#none" id="ref-for-none⑤">None</a> attestation is acceptable under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑨">Relying Party</a> policy.</p>
       <li data-md>
-       <p>If <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①③">self attestation</a> was used, verify that <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①④">self attestation</a> is acceptable under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②②⑨">Relying Party</a> policy.</p>
+       <p>If <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①③">self attestation</a> was used, verify that <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①④">self attestation</a> is acceptable under <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⓪">Relying Party</a> policy.</p>
       <li data-md>
        <p>Otherwise, use the X.509 certificates returned as the <a data-link-type="dfn" href="#attestation-trust-path" id="ref-for-attestation-trust-path②">attestation trust path</a> from the <a data-link-type="dfn" href="#verification-procedure" id="ref-for-verification-procedure⑥">verification procedure</a> to verify that the attestation public key either correctly chains up to an acceptable root certificate, or is itself an acceptable certificate (i.e., it and the root certificate obtained in Step 19 may be the same).</p>
      </ul>
     <li data-md>
      <p>Verify that the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid④">credentialId</a></code> is ≤ 1023 bytes. Credential IDs larger than this many bytes SHOULD cause the RP to fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony⑨">registration ceremony</a>.</p>
     <li data-md>
-     <p>Verify that the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid⑤">credentialId</a></code> is not yet registered for any user. If the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid⑥">credentialId</a></code> is already known then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⓪">Relying Party</a> SHOULD fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⓪">registration ceremony</a>.</p>
-     <p class="note" role="note"><span>NOTE:</span> The rationale for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③①">Relying Parties</a> rejecting duplicate <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②⑨">credential IDs</a> is as follows: <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⓪">credential IDs</a> contain sufficient entropy that accidental duplication is very unlikely. However, <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⑥">attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑤">self attestation</a> do not include a self-signature to explicitly prove possession of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②⓪">credential private key</a> at <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑦">registration</a> time. Thus an attacker who has managed to obtain a user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③①">credential ID</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑨">credential public key</a> for a site (this could be potentially accomplished in various ways), could attempt to register a victim’s credential as their own at that site. If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③②">Relying Party</a> accepts this new registration and replaces the victim’s existing credential registration, and the <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①①">credentials are discoverable</a>, then the victim could be forced to sign into the attacker’s account at their next attempt. Data saved to the site by the victim in that state would then be available to the attacker.</p>
+     <p>Verify that the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid⑤">credentialId</a></code> is not yet registered for any user. If the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid⑥">credentialId</a></code> is already known then the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③①">Relying Party</a> SHOULD fail this <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⓪">registration ceremony</a>.</p>
+     <p class="note" role="note"><span>NOTE:</span> The rationale for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③②">Relying Parties</a> rejecting duplicate <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id②⑨">credential IDs</a> is as follows: <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⓪">credential IDs</a> contain sufficient entropy that accidental duplication is very unlikely. However, <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type①⑥">attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑤">self attestation</a> do not include a self-signature to explicitly prove possession of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②⓪">credential private key</a> at <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑦">registration</a> time. Thus an attacker who has managed to obtain a user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③①">credential ID</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key②⑨">credential public key</a> for a site (this could be potentially accomplished in various ways), could attempt to register a victim’s credential as their own at that site. If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③③">Relying Party</a> accepts this new registration and replaces the victim’s existing credential registration, and the <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①①">credentials are discoverable</a>, then the victim could be forced to sign into the attacker’s account at their next attempt. Data saved to the site by the victim in that state would then be available to the attacker.</p>
     <li data-md>
      <p>If the attestation statement <var>attStmt</var> verified successfully and is found to be trustworthy, then register the new
 credential with the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account②⑨">user account</a> that was denoted in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑥">user</a></code></code>:</p>
      <ul>
       <li data-md>
-       <p>Associate the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⓪">user account</a> with the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid⑦">credentialId</a></code> and <code><a data-link-type="dfn" href="#credentialpublickey" id="ref-for-credentialpublickey⑥">credentialPublicKey</a></code> in <code><var>authData</var>.<a data-link-type="dfn" href="#attestedcredentialdata" id="ref-for-attestedcredentialdata⑧">attestedCredentialData</a></code>, as appropriate for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③③">Relying Party</a>'s system.</p>
+       <p>Associate the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⓪">user account</a> with the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid⑦">credentialId</a></code> and <code><a data-link-type="dfn" href="#credentialpublickey" id="ref-for-credentialpublickey⑥">credentialPublicKey</a></code> in <code><var>authData</var>.<a data-link-type="dfn" href="#attestedcredentialdata" id="ref-for-attestedcredentialdata⑧">attestedCredentialData</a></code>, as appropriate for the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③④">Relying Party</a>'s system.</p>
       <li data-md>
        <p>Associate the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid⑧">credentialId</a></code> with a new stored <a data-link-type="dfn" href="#signature-counter" id="ref-for-signature-counter②④">signature counter</a> value
 initialized to the value of <code><var>authData</var>.<a data-link-type="dfn" href="#signcount" id="ref-for-signcount④">signCount</a></code>.</p>
@@ -4903,34 +5025,34 @@ <h3 class="heading settled" data-level="7.1" id="sctn-registering-a-new-credenti
      <ul>
       <li data-md>
        <p>Associate the <code><a data-link-type="dfn" href="#credentialid" id="ref-for-credentialid⑨">credentialId</a></code> with the transport hints
-returned by calling <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response⑥">response</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports④">getTransports()</a></code></code>.
+returned by calling <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response⑥">response</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports⑤">getTransports()</a></code></code>.
 This value SHOULD NOT be modified before or after storing it.
-It is RECOMMENDED to use this value to populate the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports①①">transports</a></code> of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①③">allowCredentials</a></code> option in future <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑧">get()</a></code> calls
-to help the <a data-link-type="dfn" href="#client" id="ref-for-client⑦②">client</a> know how to find a suitable <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⓪">authenticator</a>.</p>
+It is RECOMMENDED to use this value to populate the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑥">transports</a></code> of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①③">allowCredentials</a></code> option in future <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑨">get()</a></code> calls
+to help the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑨">client</a> know how to find a suitable <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⓪">authenticator</a>.</p>
      </ul>
     <li data-md>
-     <p>If the attestation statement <var>attStmt</var> successfully verified but is not trustworthy per step 20 above, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③④">Relying Party</a> SHOULD fail
+     <p>If the attestation statement <var>attStmt</var> successfully verified but is not trustworthy per step 20 above, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑤">Relying Party</a> SHOULD fail
 the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①①">registration ceremony</a>.</p>
-     <p class="note" role="note"><span>NOTE:</span> However, if permitted by policy, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑤">Relying Party</a> MAY register the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③②">credential ID</a> and credential public key but treat the
-    credential as one with <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑥">self attestation</a> (see <a href="#sctn-attestation-types">§ 6.5.3 Attestation Types</a>). If doing so, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑥">Relying Party</a> is asserting there
+     <p class="note" role="note"><span>NOTE:</span> However, if permitted by policy, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑥">Relying Party</a> MAY register the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③②">credential ID</a> and credential public key but treat the
+    credential as one with <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑥">self attestation</a> (see <a href="#sctn-attestation-types">§ 6.5.3 Attestation Types</a>). If doing so, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑦">Relying Party</a> is asserting there
     is no cryptographic proof that the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤②">public key credential</a> has been generated by a particular <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①①">authenticator</a> model.
     See <a data-link-type="biblio" href="#biblio-fidosecref">[FIDOSecRef]</a> and <a data-link-type="biblio" href="#biblio-uafprotocol">[UAFProtocol]</a> for a more detailed discussion.</p>
    </ol>
-   <p>Verification of <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑥">attestation objects</a> requires that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑦">Relying Party</a> has a trusted method of determining acceptable trust anchors
-in step 19 above. Also, if certificates are being used, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑧">Relying Party</a> MUST have access to certificate status information for the
-intermediate CA certificates. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑨">Relying Party</a> MUST also be able to build the attestation certificate chain if the client did not
+   <p>Verification of <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑥">attestation objects</a> requires that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑧">Relying Party</a> has a trusted method of determining acceptable trust anchors
+in step 19 above. Also, if certificates are being used, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②③⑨">Relying Party</a> MUST have access to certificate status information for the
+intermediate CA certificates. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⓪">Relying Party</a> MUST also be able to build the attestation certificate chain if the client did not
 provide this chain in the attestation information.</p>
    <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span class="secno">7.2. </span><span class="content">Verifying an Authentication Assertion</span><a class="self-link" href="#sctn-verifying-assertion"></a></h3>
-   <p>In order to perform an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⓪">authentication ceremony</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⓪">Relying Party</a> MUST proceed as follows:</p>
+   <p>In order to perform an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⓪">authentication ceremony</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④①">Relying Party</a> MUST proceed as follows:</p>
    <ol>
     <li data-md>
-     <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑥">PublicKeyCredentialRequestOptions</a></code> structure configured to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④①">Relying Party</a>'s needs for the ceremony.</p>
+     <p>Let <var>options</var> be a new <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①⓪">PublicKeyCredentialRequestOptions</a></code> structure configured to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④②">Relying Party</a>'s needs for the ceremony.</p>
      <p>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①④">allowCredentials</a></code></code> is present,
-the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports①②">transports</a></code> member of each <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①⓪">item</a> SHOULD be set to
-the value that was returned by <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response⑦">response</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports⑤">getTransports()</a></code></code> when the corresponding credential was registered.</p>
-     <p class="note" role="note"><span>Note:</span> Modifying or removing <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①①">items</a> from values returned from <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports⑥">getTransports()</a></code> could negatively impact user experience, or even prevent use of the corresponding credentials.</p>
+the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-transports" id="ref-for-dom-publickeycredentialdescriptor-transports⑦">transports</a></code> member of each <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①⓪">item</a> SHOULD be set to
+the value that was returned by <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response⑦">response</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports⑥">getTransports()</a></code></code> when the corresponding credential was registered.</p>
+     <p class="note" role="note"><span>Note:</span> Modifying or removing <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-item" id="ref-for-list-item①①">items</a> from values returned from <code class="idl"><a data-link-type="idl" href="#dom-authenticatorattestationresponse-gettransports" id="ref-for-dom-authenticatorattestationresponse-gettransports⑦">getTransports()</a></code> could negatively impact user experience, or even prevent use of the corresponding credentials.</p>
     <li data-md>
-     <p>Call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get②⑨">navigator.credentials.get()</a></code> and pass <var>options</var> as the <code><code class="idl"><a data-link-type="idl" href="#dom-credentialrequestoptions-publickey" id="ref-for-dom-credentialrequestoptions-publickey④">publicKey</a></code></code> option.
+     <p>Call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⓪">navigator.credentials.get()</a></code> and pass <var>options</var> as the <code><code class="idl"><a data-link-type="idl" href="#dom-credentialrequestoptions-publickey" id="ref-for-dom-credentialrequestoptions-publickey④">publicKey</a></code></code> option.
 Let <var>credential</var> be the result of the successfully resolved promise.
 If the promise is rejected, abort the ceremony with a user-visible error, or otherwise guide the user experience as might
 be determinable from the context available in the rejected promise. For information on different error contexts and the
@@ -4939,7 +5061,7 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
      <p>Let <var>response</var> be <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-response" id="ref-for-dom-publickeycredential-response⑧">response</a></code></code>.
 If <var>response</var> is not an instance of <code class="idl"><a data-link-type="idl" href="#authenticatorassertionresponse" id="ref-for-authenticatorassertionresponse⑦">AuthenticatorAssertionResponse</a></code>, abort the ceremony with a user-visible error.</p>
     <li data-md>
-     <p>Let <var>clientExtensionResults</var> be the result of calling <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults②">getClientExtensionResults()</a></code></code>.</p>
+     <p>Let <var>clientExtensionResults</var> be the result of calling <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults③">getClientExtensionResults()</a></code></code>.</p>
     <li data-md>
      <p>If <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①⑤">allowCredentials</a></code></code> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-is-empty" id="ref-for-list-is-empty⑨">is not empty</a>,
 verify that <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-id" id="ref-for-dom-credential-id①">id</a></code></code> identifies one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤③">public key credentials</a> listed in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①⑥">allowCredentials</a></code></code>.</p>
@@ -4956,7 +5078,7 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
 present, and that the user identified by this value is the owner of <var>credentialSource</var>.</p>
      </dl>
     <li data-md>
-     <p>Using <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-id" id="ref-for-dom-credential-id③">id</a></code></code> (or <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-rawid" id="ref-for-dom-publickeycredential-rawid②">rawId</a></code></code>, if <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑧">base64url encoding</a> is inappropriate for your use case), look up the corresponding <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⓪">credential public key</a> and let <var>credentialPublicKey</var> be that <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③①">credential public key</a>.</p>
+     <p>Using <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credential-id" id="ref-for-dom-credential-id③">id</a></code></code> (or <code><var>credential</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-rawid" id="ref-for-dom-publickeycredential-rawid②">rawId</a></code></code>, if <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①②">base64url encoding</a> is inappropriate for your use case), look up the corresponding <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⓪">credential public key</a> and let <var>credentialPublicKey</var> be that <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③①">credential public key</a>.</p>
     <li data-md>
      <p>Let <var>cData</var>, <var>authData</var> and <var>sig</var> denote the value of <var>response</var>’s <code class="idl"><a data-link-type="idl" href="#dom-authenticatorresponse-clientdatajson" id="ref-for-dom-authenticatorresponse-clientdatajson⑧">clientDataJSON</a></code>, <code class="idl"><a data-link-type="idl" href="#dom-authenticatorassertionresponse-authenticatordata" id="ref-for-dom-authenticatorassertionresponse-authenticatordata②">authenticatorData</a></code>, and <code class="idl"><a data-link-type="idl" href="#dom-authenticatorassertionresponse-signature" id="ref-for-dom-authenticatorassertionresponse-signature②">signature</a></code> respectively.</p>
     <li data-md>
@@ -4974,27 +5096,27 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
      <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge⑦">challenge</a></code></code> equals
 the base64url encoding of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge③">challenge</a></code></code>.</p>
     <li data-md>
-     <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑧">origin</a></code></code> matches the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④②">Relying Party</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①④">origin</a>.</p>
+     <p>Verify that the value of <code><var>C</var>.<code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-origin" id="ref-for-dom-collectedclientdata-origin⑧">origin</a></code></code> matches the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④③">Relying Party</a>'s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/origin.html#concept-origin" id="ref-for-concept-origin①④">origin</a>.</p>
     <li id="rp-op-verifying-assertion-step-rpid-hash">
-     <a class="self-link" href="#rp-op-verifying-assertion-step-rpid-hash"></a> Verify that the <code><a data-link-type="dfn" href="#rpidhash" id="ref-for-rpidhash③">rpIdHash</a></code> in <var>authData</var> is the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑥">RP ID</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④③">Relying Party</a>. 
+     <a class="self-link" href="#rp-op-verifying-assertion-step-rpid-hash"></a> Verify that the <code><a data-link-type="dfn" href="#rpidhash" id="ref-for-rpidhash③">rpIdHash</a></code> in <var>authData</var> is the SHA-256 hash of the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑥">RP ID</a> expected by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④④">Relying Party</a>. 
      <p class="note" role="note"><span>Note:</span> If using the <a data-link-type="dfn" href="#appid" id="ref-for-appid①">appid</a> extension, this step needs some special logic. See <a href="#sctn-appid-extension">§ 10.1 FIDO AppID Extension (appid)</a> for details.</p>
     <li data-md>
      <p>Verify that the <a data-link-type="dfn" href="#concept-user-present" id="ref-for-concept-user-present⑤">User Present</a> bit of the <code><a data-link-type="dfn" href="#flags" id="ref-for-flags③①">flags</a></code> in <var>authData</var> is set.</p>
     <li data-md>
-     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④④">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④②">user verification</a> for this assertion,
+     <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑤">Relying Party</a> requires <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④②">user verification</a> for this assertion,
 verify that the <a data-link-type="dfn" href="#concept-user-verified" id="ref-for-concept-user-verified⑤">User Verified</a> bit of the <code><a data-link-type="dfn" href="#flags" id="ref-for-flags③②">flags</a></code> in <var>authData</var> is set.</p>
     <li data-md>
      <p>If the credential <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state⑤">backup state</a> is used as part of Relying Party business logic or policy, compare the previously stored
 value with the <a data-link-type="dfn" href="#backup-state" id="ref-for-backup-state⑥">backup state</a> (BS) bit of the <code><a data-link-type="dfn" href="#flags" id="ref-for-flags③③">flags</a></code> in <var>authData</var>, perform evaluation, and then store the new value.</p>
     <li data-md>
      <p>Verify that the values of the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑧">client extension outputs</a> in <var>clientExtensionResults</var> and the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑤">authenticator extension
-outputs</a> in the <code><a data-link-type="dfn" href="#authdataextensions" id="ref-for-authdataextensions⑧">extensions</a></code> in <var>authData</var> are as expected, considering the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input④">client
-extension input</a> values that were given in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions④">extensions</a></code></code> and any specific policy of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑤">Relying Party</a> regarding unsolicited extensions, i.e., those that were not specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions⑤">extensions</a></code></code>.
-In the general case, the meaning of "are as expected" is specific to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑥">Relying Party</a> and which extensions are in use.</p>
-     <p class="note" role="note"><span>Note:</span> <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑤">Client platforms</a> MAY enact local policy that sets additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension③">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension③">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑥">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑨">client extension outputs</a> that were not originally specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions⑥">extensions</a></code></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑦">Relying Parties</a> MUST be prepared to handle such
-situations, whether it be to ignore the unsolicited extensions or reject the assertion. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑧">Relying Party</a> can make this
+outputs</a> in the <code><a data-link-type="dfn" href="#authdataextensions" id="ref-for-authdataextensions⑧">extensions</a></code> in <var>authData</var> are as expected, considering the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑥">client
+extension input</a> values that were given in <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions④">extensions</a></code></code> and any specific policy of the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑥">Relying Party</a> regarding unsolicited extensions, i.e., those that were not specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions⑤">extensions</a></code></code>.
+In the general case, the meaning of "are as expected" is specific to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑦">Relying Party</a> and which extensions are in use.</p>
+     <p class="note" role="note"><span>Note:</span> <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑤">Client platforms</a> MAY enact local policy that sets additional <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension③">authenticator extensions</a> or <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension③">client extensions</a> and thus cause values to appear in the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑥">authenticator extension outputs</a> or <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output⑨">client extension outputs</a> that were not originally specified as part of <code><var>options</var>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-extensions" id="ref-for-dom-publickeycredentialrequestoptions-extensions⑥">extensions</a></code></code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑧">Relying Parties</a> MUST be prepared to handle such
+situations, whether it be to ignore the unsolicited extensions or reject the assertion. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑨">Relying Party</a> can make this
 decision based on local policy and the extensions in use.</p>
-     <p class="note" role="note"><span>Note:</span> Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑦③">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①②">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②④⑨">Relying Party</a> MUST also be
+     <p class="note" role="note"><span>Note:</span> Since all extensions are OPTIONAL for both the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⓪">client</a> and the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①②">authenticator</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⓪">Relying Party</a> MUST also be
 prepared to handle cases where none or not all of the requested extensions were acted upon.</p>
     <li data-md>
      <p>Let <var>hash</var> be the result of computing a hash over the <var>cData</var> using SHA-256.</p>
@@ -5015,8 +5137,8 @@ <h3 class="heading settled" data-level="7.2" id="sctn-verifying-assertion"><span
         <dd>This is a signal that
           the authenticator may be cloned, i.e. at least
           two copies of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②①">credential private key</a> may exist and are
-          being used in parallel. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⓪">Relying Parties</a> should incorporate this information
-          into their risk scoring.  Whether the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤①">Relying Party</a> updates <var>storedSignCount</var> in this case, or not, or fails the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②③">authentication ceremony</a> or not, is <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤②">Relying Party</a>-specific. 
+          being used in parallel. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤①">Relying Parties</a> should incorporate this information
+          into their risk scoring.  Whether the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤②">Relying Party</a> updates <var>storedSignCount</var> in this case, or not, or fails the <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②③">authentication ceremony</a> or not, is <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤③">Relying Party</a>-specific. 
        </dl>
      </ul>
     <li data-md>
@@ -5302,7 +5424,7 @@ <h3 class="heading settled" data-level="8.4" id="sctn-android-key-attestation"><
 attestation statement is based on the <a href="https://source.android.com/security/keystore/attestation">Android key
 attestation</a>. In these cases, the attestation statement
 is produced by a component running in a secure operating environment, but the <a data-link-type="dfn" href="#authenticator-data-for-the-attestation" id="ref-for-authenticator-data-for-the-attestation②">authenticator data for the attestation</a> is
-produced outside this environment. The <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑧">WebAuthn Relying Party</a> is expected to check that the <a data-link-type="dfn" href="#authenticator-data-claimed-to-have-been-used-for-the-attestation" id="ref-for-authenticator-data-claimed-to-have-been-used-for-the-attestation">authenticator data claimed to have been used for
+produced outside this environment. The <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⓪">WebAuthn Relying Party</a> is expected to check that the <a data-link-type="dfn" href="#authenticator-data-claimed-to-have-been-used-for-the-attestation" id="ref-for-authenticator-data-claimed-to-have-been-used-for-the-attestation">authenticator data claimed to have been used for
 the attestation</a> is consistent with the fields of the attestation certificate’s extension data.</p>
    <dl>
     <dt data-md>Attestation statement format identifier
@@ -5468,7 +5590,7 @@ <h3 class="heading settled" data-level="8.6" id="sctn-fido-u2f-attestation"><spa
       <dt data-md>sig
       <dd data-md>
        <p>The <a data-link-type="dfn" href="#attestation-signature" id="ref-for-attestation-signature①③">attestation signature</a>.
-The signature was calculated over the (raw) U2F registration response message <a data-link-type="biblio" href="#biblio-fido-u2f-message-formats">[FIDO-U2F-Message-Formats]</a> received by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦④">client</a> from the authenticator.</p>
+The signature was calculated over the (raw) U2F registration response message <a data-link-type="biblio" href="#biblio-fido-u2f-message-formats">[FIDO-U2F-Message-Formats]</a> received by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧①">client</a> from the authenticator.</p>
      </dl>
     <dt data-md>Signing procedure
     <dd data-md>
@@ -5523,7 +5645,7 @@ <h3 class="heading settled" data-level="8.6" id="sctn-fido-u2f-attestation"><spa
      </ol>
    </dl>
    <h3 class="heading settled" data-level="8.7" id="sctn-none-attestation"><span class="secno">8.7. </span><span class="content">None Attestation Statement Format</span><a class="self-link" href="#sctn-none-attestation"></a></h3>
-   <p>The none attestation statement format is used to replace any <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⑥">authenticator</a>-provided <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑥">attestation statement</a> when a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party②⑨">WebAuthn Relying Party</a> indicates it does not wish to receive attestation information, see <a href="#enum-attestation-convey">§ 5.4.7 Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a>.</p>
+   <p>The none attestation statement format is used to replace any <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⑥">authenticator</a>-provided <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑥">attestation statement</a> when a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③①">WebAuthn Relying Party</a> indicates it does not wish to receive attestation information, see <a href="#enum-attestation-convey">§ 5.4.7 Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a>.</p>
    <p>The <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⑦">authenticator</a> MAY also directly generate attestation statements of this format
 if the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②①⑧">authenticator</a> does not support <a data-link-type="dfn" href="#attestation" id="ref-for-attestation①⑧">attestation</a>.</p>
    <dl>
@@ -5620,16 +5742,16 @@ <h2 class="heading settled" data-level="9" id="sctn-extensions"><span class="sec
 client. <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension④">Client extensions</a> define the following steps and data:</p>
    <ul>
     <li data-md>
-     <p><code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑤">navigator.credentials.create()</a></code> extension request parameters and response values for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②">registration extensions</a>.</p>
+     <p><code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑥">navigator.credentials.create()</a></code> extension request parameters and response values for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②">registration extensions</a>.</p>
     <li data-md>
-     <p><code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⓪">navigator.credentials.get()</a></code> extension request parameters and response values for <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension②">authentication extensions</a>.</p>
+     <p><code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③①">navigator.credentials.get()</a></code> extension request parameters and response values for <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension②">authentication extensions</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑤">Client extension processing</a> for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension③">registration extensions</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension③">authentication extensions</a>.</p>
    </ul>
-   <p>When creating a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑥">public key credential</a> or requesting an <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①③">authentication assertion</a>, a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⓪">WebAuthn Relying Party</a> can request the use of a set
-of extensions. These extensions will be invoked during the requested operation if they are supported by the client and/or the <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑥">WebAuthn Authenticator</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤③">Relying Party</a> sends the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑤">client extension input</a> for each extension in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③①">get()</a></code> call
-(for <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension④">authentication extensions</a>) or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑥">create()</a></code> call (for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension④">registration extensions</a>) to the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑤">client</a>.
-The <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑥">client</a> performs <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑥">client extension processing</a> for each extension that the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑥">client platform</a> supports, and augments the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①③">client data</a> as specified by each extension, by including the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier⑧">extension identifier</a> and <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⓪">client extension output</a> values.</p>
+   <p>When creating a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑥">public key credential</a> or requesting an <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①③">authentication assertion</a>, a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③②">WebAuthn Relying Party</a> can request the use of a set
+of extensions. These extensions will be invoked during the requested operation if they are supported by the client and/or the <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑥">WebAuthn Authenticator</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤④">Relying Party</a> sends the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑦">client extension input</a> for each extension in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③②">get()</a></code> call
+(for <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension④">authentication extensions</a>) or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑦">create()</a></code> call (for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension④">registration extensions</a>) to the <a data-link-type="dfn" href="#client" id="ref-for-client⑧②">client</a>.
+The <a data-link-type="dfn" href="#client" id="ref-for-client⑧③">client</a> performs <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑥">client extension processing</a> for each extension that the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑥">client platform</a> supports, and augments the <a data-link-type="dfn" href="#client-data" id="ref-for-client-data①③">client data</a> as specified by each extension, by including the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier⑧">extension identifier</a> and <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⓪">client extension output</a> values.</p>
    <p>An extension can also be an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-extension">authenticator extension</dfn>, meaning that the extension involves communication with and
 processing by the authenticator. <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension④">Authenticator extensions</a> define the following steps and data:</p>
    <ul>
@@ -5640,15 +5762,15 @@ <h2 class="heading settled" data-level="9" id="sctn-extensions"><span class="sec
     <li data-md>
      <p><a data-link-type="dfn" href="#authenticator-extension-processing" id="ref-for-authenticator-extension-processing②">Authenticator extension processing</a> for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension⑥">registration extensions</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension⑥">authentication extensions</a>.</p>
    </ul>
-   <p>For <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑤">authenticator extensions</a>, as part of the <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑦">client extension processing</a>, the client also creates the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①①">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input⑤">authenticator extension input</a> value for each extension (often based on the corresponding <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑥">client extension input</a> value),
-and passes them to the authenticator in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑦">create()</a></code> call (for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension⑦">registration extensions</a>) or the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③②">get()</a></code> call (for <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension⑦">authentication extensions</a>). These <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input⑥">authenticator extension input</a> values are
+   <p>For <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑤">authenticator extensions</a>, as part of the <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑦">client extension processing</a>, the client also creates the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①①">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input⑤">authenticator extension input</a> value for each extension (often based on the corresponding <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑧">client extension input</a> value),
+and passes them to the authenticator in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑧">create()</a></code> call (for <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension⑦">registration extensions</a>) or the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③③">get()</a></code> call (for <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension⑦">authentication extensions</a>). These <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input⑥">authenticator extension input</a> values are
 represented in <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①②">CBOR</a> and passed as name-value pairs, with the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier⑨">extension identifier</a> as the name, and the corresponding <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input⑦">authenticator extension input</a> as the value. The authenticator, in turn, performs additional processing for the extensions
 that it supports, and returns the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①③">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑦">authenticator extension output</a> for each as specified by the extension. Part of
 the <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑧">client extension processing</a> for <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑥">authenticator extensions</a> is to use the <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑧">authenticator extension output</a> as an
 input to creating the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①①">client extension output</a>.</p>
-   <p>All <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑧">WebAuthn Extensions</a> are OPTIONAL for both clients and authenticators. Thus, any extensions requested by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤④">Relying Party</a> MAY be
+   <p>All <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑧">WebAuthn Extensions</a> are OPTIONAL for both clients and authenticators. Thus, any extensions requested by a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑤">Relying Party</a> MAY be
 ignored by the client browser or OS and not passed to the authenticator at all, or they MAY be ignored by the authenticator.
-Ignoring an extension is never considered a failure in WebAuthn API processing, so when <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑤">Relying Parties</a> include extensions with any
+Ignoring an extension is never considered a failure in WebAuthn API processing, so when <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑥">Relying Parties</a> include extensions with any
 API calls, they MUST be prepared to handle cases where some or all of those extensions are ignored.</p>
    <p>All <a data-link-type="dfn" href="#webauthn-extensions" id="ref-for-webauthn-extensions⑨">WebAuthn Extensions</a> MUST be defined in such a way that this implementation choice does not endanger the user’s
 security or privacy. For instance, if an extension requires client processing, it could be defined in a manner that ensures such
@@ -5671,26 +5793,26 @@ <h3 class="heading settled" data-level="9.1" id="sctn-extension-id"><span class=
    <p><a href="#sctn-defined-extensions">§ 10 Defined Extensions</a> defines an additional set of extensions and their identifiers.
 See the IANA "WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries">[IANA-WebAuthn-Registries]</a> established by <a data-link-type="biblio" href="#biblio-rfc8809">[RFC8809]</a> for an up-to-date list of registered WebAuthn Extension Identifiers.</p>
    <h3 class="heading settled" data-level="9.2" id="sctn-extension-specification"><span class="secno">9.2. </span><span class="content">Defining Extensions</span><a class="self-link" href="#sctn-extension-specification"></a></h3>
-   <p>A definition of an extension MUST specify an <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⓪">extension identifier</a>, a <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑦">client extension input</a> argument
-to be sent via the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③③">get()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑧">create()</a></code> call,
+   <p>A definition of an extension MUST specify an <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⓪">extension identifier</a>, a <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑨">client extension input</a> argument
+to be sent via the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③④">get()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑨">create()</a></code> call,
 the <a data-link-type="dfn" href="#client-extension-processing" id="ref-for-client-extension-processing⑨">client extension processing</a> rules, and a <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①②">client extension output</a> value.
 If the extension communicates with the authenticator (meaning it is an <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑦">authenticator extension</a>),
 it MUST also specify the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①④">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input⑨">authenticator extension input</a> argument
 sent via the <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⑦">authenticatorGetAssertion</a> or <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①⑦">authenticatorMakeCredential</a> call,
 the <a data-link-type="dfn" href="#authenticator-extension-processing" id="ref-for-authenticator-extension-processing③">authenticator extension processing</a> rules, and the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⑤">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output⑨">authenticator extension output</a> value.</p>
-   <p>Any <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑤">client extension</a> that is processed by the client MUST return a <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①③">client extension output</a> value so that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③①">WebAuthn Relying Party</a> knows that the extension was honored by the client. Similarly, any extension that requires authenticator processing MUST return
-an <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①⓪">authenticator extension output</a> to let the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑥">Relying Party</a> know that the extension was honored by the authenticator. If an
+   <p>Any <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑤">client extension</a> that is processed by the client MUST return a <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①③">client extension output</a> value so that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③③">WebAuthn Relying Party</a> knows that the extension was honored by the client. Similarly, any extension that requires authenticator processing MUST return
+an <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①⓪">authenticator extension output</a> to let the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑦">Relying Party</a> know that the extension was honored by the authenticator. If an
 extension does not otherwise require any result values, it SHOULD be defined as returning a JSON Boolean <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①④">client extension
 output</a> result, set to <code>true</code> to signify that the extension was understood and processed. Likewise, any <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑧">authenticator
 extension</a> that does not otherwise require any result values MUST return a value and SHOULD return a CBOR Boolean <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①①">authenticator extension output</a> result, set to <code>true</code> to signify that the extension was understood and processed.</p>
    <h3 class="heading settled" data-level="9.3" id="sctn-extension-request-parameters"><span class="secno">9.3. </span><span class="content">Extending Request Parameters</span><a class="self-link" href="#sctn-extension-request-parameters"></a></h3>
    <p>An extension defines one or two request arguments. The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-extension-input">client extension input</dfn>,
-which is a value that can be encoded in JSON, is passed from the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③②">WebAuthn Relying Party</a> to the client
-in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③④">get()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create②⑨">create()</a></code> call,
+which is a value that can be encoded in JSON, is passed from the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③④">WebAuthn Relying Party</a> to the client
+in the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑤">get()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⓪">create()</a></code> call,
 while the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⑥">CBOR</a> <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-extension-input">authenticator extension input</dfn> is
 passed from the client to the authenticator for <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension⑨">authenticator extensions</a> during the processing of these calls.</p>
-   <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑦">Relying Party</a> simultaneously requests the use of an extension and sets its <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑧">client extension input</a> by including an entry in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑦">extensions</a></code> option to the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③⓪">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑤">get()</a></code> call.
-The entry key is the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①①">extension identifier</a> and the value is the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input⑨">client extension input</a>.</p>
+   <p>A <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑧">Relying Party</a> simultaneously requests the use of an extension and sets its <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⓪">client extension input</a> by including an entry in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-extensions" id="ref-for-dom-publickeycredentialcreationoptions-extensions⑦">extensions</a></code> option to the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③①">create()</a></code> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑥">get()</a></code> call.
+The entry key is the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①①">extension identifier</a> and the value is the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①①">client extension input</a>.</p>
    <p class="note" role="note"><span>Note:</span> Other documents have specified extensions where the extension input does not always use the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①②">extension identifier</a> as the entry key.
 New extensions SHOULD follow the above convention.</p>
 <pre class="example highlight" id="example-5335c503"><a class="self-link" href="#example-5335c503"></a><c- a>var</c-> assertionPromise <c- o>=</c-> navigator<c- p>.</c->credentials<c- p>.</c->get<c- p>({</c->
@@ -5707,14 +5829,14 @@ <h3 class="heading settled" data-level="9.3" id="sctn-extension-request-paramete
     <c- p>}</c->
 <c- p>});</c->
 </pre>
-   <p>Extension definitions MUST specify the valid values for their <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⓪">client extension input</a>. Clients SHOULD ignore extensions with
-an invalid <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①①">client extension input</a>. If an extension does not require any parameters from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑧">Relying Party</a>, it SHOULD be defined
-as taking a Boolean client argument, set to <code>true</code> to signify that the extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑨">Relying Party</a>.</p>
+   <p>Extension definitions MUST specify the valid values for their <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①②">client extension input</a>. Clients SHOULD ignore extensions with
+an invalid <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①③">client extension input</a>. If an extension does not require any parameters from the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑤⑨">Relying Party</a>, it SHOULD be defined
+as taking a Boolean client argument, set to <code>true</code> to signify that the extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⓪">Relying Party</a>.</p>
    <p>Extensions that only affect client processing need not specify <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①⓪">authenticator extension input</a>. Extensions that have
-authenticator processing MUST specify the method of computing the <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①①">authenticator extension input</a> from the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①②">client extension
+authenticator processing MUST specify the method of computing the <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①①">authenticator extension input</a> from the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①④">client extension
 input</a>,
 and MUST define extensions for the <a data-link-type="dfn" href="#cddl" id="ref-for-cddl②">CDDL</a> types <code><a href="#iface-authentication-extensions-authenticator-inputs">AuthenticationExtensionsAuthenticatorInputs</a></code> and <code><a href="#iface-authentication-extensions-authenticator-outputs">AuthenticationExtensionsAuthenticatorOutputs</a></code> by defining an additional choice for the <code>$$extensionInput</code> and <code>$$extensionOutput</code> <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc8610#section-3.9" id="ref-for-section-3.9">group sockets</a> using the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①③">extension identifier</a> as the entry key.
-Extensions that do not require input parameters, and are thus defined as taking a Boolean <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①③">client extension input</a> value set to <code>true</code>,
+Extensions that do not require input parameters, and are thus defined as taking a Boolean <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑤">client extension input</a> value set to <code>true</code>,
 SHOULD define the <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①②">authenticator extension input</a> also as the constant Boolean value <code>true</code> (CBOR major type
 7, value 21).</p>
    <p>The following example defines that an extension with <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①④">identifier</a> <code>webauthnExample_foobar</code> takes an unsigned integer as <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①③">authenticator extension input</a>,
@@ -5729,14 +5851,14 @@ <h3 class="heading settled" data-level="9.3" id="sctn-extension-request-paramete
    <p class="note" role="note"><span>Note:</span> Extensions should aim to define authenticator arguments that are as small as possible. Some authenticators communicate
     over low-bandwidth links such as Bluetooth Low-Energy or NFC.</p>
    <h3 class="heading settled" data-level="9.4" id="sctn-client-extension-processing"><span class="secno">9.4. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-extension-processing">Client Extension Processing</dfn></span><a class="self-link" href="#sctn-client-extension-processing"></a></h3>
-   <p>Extensions MAY define additional processing requirements on the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑦">client</a> during the creation of credentials or the
-generation of an assertion. The <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①④">client extension input</a> for the extension is used as an input to this client processing.
-For each supported <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑥">client extension</a>, the client adds an entry to the <var>clientExtensions</var> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map⑨">map</a> with the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⑤">extension identifier</a> as the key, and the extension’s <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑤">client extension input</a> as the value.</p>
-   <p>Likewise, the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⑤">client extension outputs</a> are represented as a dictionary in the result of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults③">getClientExtensionResults()</a></code> with <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⑥">extension identifiers</a> as keys, and the <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-extension-output">client extension output</dfn> value of each extension as the value.
-Like the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑥">client extension input</a>, the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⑥">client extension output</a> is a value that can be encoded in JSON.
+   <p>Extensions MAY define additional processing requirements on the <a data-link-type="dfn" href="#client" id="ref-for-client⑧④">client</a> during the creation of credentials or the
+generation of an assertion. The <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑥">client extension input</a> for the extension is used as an input to this client processing.
+For each supported <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑥">client extension</a>, the client adds an entry to the <var>clientExtensions</var> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map⑨">map</a> with the <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⑤">extension identifier</a> as the key, and the extension’s <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑦">client extension input</a> as the value.</p>
+   <p>Likewise, the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⑤">client extension outputs</a> are represented as a dictionary in the result of <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-getclientextensionresults" id="ref-for-dom-publickeycredential-getclientextensionresults④">getClientExtensionResults()</a></code> with <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⑥">extension identifiers</a> as keys, and the <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="client-extension-output">client extension output</dfn> value of each extension as the value.
+Like the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑧">client extension input</a>, the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⑥">client extension output</a> is a value that can be encoded in JSON.
 There MUST NOT be any values returned for ignored extensions.</p>
    <p>Extensions that require authenticator processing MUST define
-the process by which the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑦">client extension input</a> can be used to determine the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⑦">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①④">authenticator extension input</a> and
+the process by which the <a data-link-type="dfn" href="#client-extension-input" id="ref-for-client-extension-input①⑨">client extension input</a> can be used to determine the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⑦">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①④">authenticator extension input</a> and
 the process by which the <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⑧">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-output" id="ref-for-authenticator-extension-output①③">authenticator extension output</a> can be used to determine the <a data-link-type="dfn" href="#client-extension-output" id="ref-for-client-extension-output①⑦">client extension output</a>.</p>
    <h3 class="heading settled" data-level="9.5" id="sctn-authenticator-extension-processing"><span class="secno">9.5. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="authenticator-extension-processing">Authenticator Extension Processing</dfn></span><a class="self-link" href="#sctn-authenticator-extension-processing"></a></h3>
    <p>The <a data-link-type="dfn" href="#cbor" id="ref-for-cbor①⑨">CBOR</a> <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①⑤">authenticator extension input</a> value of each processed <a data-link-type="dfn" href="#authenticator-extension" id="ref-for-authenticator-extension①⓪">authenticator extension</a> is included in the <var>extensions</var> parameter of the <a data-link-type="dfn" href="#authenticatormakecredential" id="ref-for-authenticatormakecredential①⑧">authenticatorMakeCredential</a> and <a data-link-type="dfn" href="#authenticatorgetassertion" id="ref-for-authenticatorgetassertion①⑧">authenticatorGetAssertion</a> operations. The <var>extensions</var> parameter is a <a data-link-type="dfn" href="#cbor" id="ref-for-cbor②⓪">CBOR</a> map where each key is an <a data-link-type="dfn" href="#extension-identifier" id="ref-for-extension-identifier①⑦">extension identifier</a> and the corresponding value is the <a data-link-type="dfn" href="#authenticator-extension-input" id="ref-for-authenticator-extension-input①⑥">authenticator extension input</a> for that extension.</p>
@@ -5748,22 +5870,22 @@ <h2 class="heading settled" data-level="10" id="sctn-defined-extensions"><span c
 IANA "WebAuthn Extension Identifiers" registry <a data-link-type="biblio" href="#biblio-iana-webauthn-registries">[IANA-WebAuthn-Registries]</a> established by <a data-link-type="biblio" href="#biblio-rfc8809">[RFC8809]</a>.
 These MAY be implemented by user agents targeting broad interoperability.</p>
    <h3 class="heading settled" data-level="10.1" id="sctn-appid-extension"><span class="secno">10.1. </span><span class="content">FIDO <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="appid">AppID</dfn> Extension (appid)</span><a class="self-link" href="#sctn-appid-extension"></a></h3>
-   <p>This extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③③">WebAuthn Relying Parties</a> that have previously registered a
+   <p>This extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑤">WebAuthn Relying Parties</a> that have previously registered a
 credential using the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi">[FIDOU2FJavaScriptAPI]</a> to request an <a data-link-type="dfn" href="#assertion" id="ref-for-assertion③">assertion</a>. The
-FIDO APIs use an alternative identifier for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⓪">Relying Parties</a> called an <var>AppID</var> <a data-link-type="biblio" href="#biblio-fido-appid">[FIDO-APPID]</a>, and any credentials created using those APIs will be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑧">scoped</a> to
+FIDO APIs use an alternative identifier for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥①">Relying Parties</a> called an <var>AppID</var> <a data-link-type="biblio" href="#biblio-fido-appid">[FIDO-APPID]</a>, and any credentials created using those APIs will be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑧">scoped</a> to
 that identifier. Without this extension, they would need to be re-registered in
 order to be <a data-link-type="dfn" href="#scope" id="ref-for-scope①⑨">scoped</a> to an <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id③⑨">RP ID</a>.</p>
    <p>In addition to setting the <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientinputs-appid" id="ref-for-dom-authenticationextensionsclientinputs-appid">appid</a></code> extension input,
-using this extension requires some additional processing by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥①">Relying Party</a> in order to allow users to <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①③">authenticate</a> using their registered U2F credentials:</p>
+using this extension requires some additional processing by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥②">Relying Party</a> in order to allow users to <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①③">authenticate</a> using their registered U2F credentials:</p>
    <ol>
     <li data-md>
      <p>List the desired U2F credentials in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①⑦">allowCredentials</a></code> option
- of the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑥">get()</a></code> method:</p>
+ of the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑦">get()</a></code> method:</p>
      <ul>
       <li data-md>
        <p>Set the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-type" id="ref-for-dom-publickeycredentialdescriptor-type④">type</a></code> members to <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialtype-public-key" id="ref-for-dom-publickeycredentialtype-public-key⑤">public-key</a></code>.</p>
       <li data-md>
-       <p>Set the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id⑥">id</a></code> members to the respective U2F key handles of the desired credentials. Note that U2F key handles commonly use <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding⑨">base64url encoding</a> but must be decoded to their binary form when used in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id⑦">id</a></code>.</p>
+       <p>Set the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id⑥">id</a></code> members to the respective U2F key handles of the desired credentials. Note that U2F key handles commonly use <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①③">base64url encoding</a> but must be decoded to their binary form when used in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialdescriptor-id" id="ref-for-dom-publickeycredentialdescriptor-id⑦">id</a></code>.</p>
      </ul>
      <p><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①⑧">allowCredentials</a></code> MAY contain a mixture
  of both WebAuthn <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③④">credential IDs</a> and U2F key handles;
@@ -5777,8 +5899,8 @@ <h3 class="heading settled" data-level="10.1" id="sctn-appid-extension"><span cl
 credentials created with WebAuthn are not backwards compatible with the FIDO
 JavaScript APIs.</p>
    <p class="note" role="note"><span>Note:</span> <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionsclientinputs-appid" id="ref-for-dom-authenticationextensionsclientinputs-appid②">appid</a></code> should be set to the AppID
-that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥②">Relying Party</a> <em>previously</em> used in the legacy FIDO APIs.
-This might not be the same as the result of translating the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥③">Relying Party</a>'s WebAuthn <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④②">RP ID</a> to the AppID format,
+that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥③">Relying Party</a> <em>previously</em> used in the legacy FIDO APIs.
+This might not be the same as the result of translating the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥④">Relying Party</a>'s WebAuthn <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④②">RP ID</a> to the AppID format,
 e.g., the previously used AppID may have been "https://accounts.example.com"
 but the currently used <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④③">RP ID</a> might be "example.com".</p>
    <dl>
@@ -5805,7 +5927,7 @@ <h3 class="heading settled" data-level="10.1" id="sctn-appid-extension"><span cl
        <p>Let <var>appId</var> be the extension input.</p>
       <li data-md>
        <p>Pass <var>facetId</var> and <var>appId</var> to the FIDO algorithm for <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-appid-and-facets-v2.0-id-20180227.html#determining-if-a-caller-s-facetid-is-authorized-for-an-appid" id="ref-for-determining-if-a-caller-s-facetid-is-authorized-for-an-appid①">determining if a
-caller’s FacetID is authorized for an AppID</a>. If that algorithm rejects <var>appId</var> then return a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror④">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑦">DOMException</a></code>.</p>
+caller’s FacetID is authorized for an AppID</a>. If that algorithm rejects <var>appId</var> then return a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror④">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑨">DOMException</a></code>.</p>
       <li data-md>
        <p>When <a href="#allowCredentialDescriptorListCreation">building allowCredentialDescriptorList</a>,
 if a U2F authenticator indicates that a credential is inapplicable (i.e. by
@@ -5825,7 +5947,7 @@ <h3 class="heading settled" data-level="10.1" id="sctn-appid-extension"><span cl
    <dl>
     <dt data-md>Client extension output
     <dd data-md>
-     <p>Returns the value of <var>output</var>. If true, the <var>AppID</var> was used and thus, when <a href="#rp-op-verifying-assertion-step-rpid-hash">verifying the assertion</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥④">Relying Party</a> MUST expect the <code><a data-link-type="dfn" href="#rpidhash" id="ref-for-rpidhash⑤">rpIdHash</a></code> to be the hash of the <var>AppID</var>, not the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑤">RP ID</a>.</p>
+     <p>Returns the value of <var>output</var>. If true, the <var>AppID</var> was used and thus, when <a href="#rp-op-verifying-assertion-step-rpid-hash">verifying the assertion</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑤">Relying Party</a> MUST expect the <code><a data-link-type="dfn" href="#rpidhash" id="ref-for-rpidhash⑤">rpIdHash</a></code> to be the hash of the <var>AppID</var>, not the <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑤">RP ID</a>.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticationextensionsclientoutputs" id="ref-for-dictdef-authenticationextensionsclientoutputs⑤"><c- g>AuthenticationExtensionsClientOutputs</c-></a> {
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑤"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationExtensionsClientOutputs" data-dfn-type="dict-member" data-export data-type="boolean " id="dom-authenticationextensionsclientoutputs-appid"><code><c- g>appid</c-></code><a class="self-link" href="#dom-authenticationextensionsclientoutputs-appid"></a></dfn>;
 };
@@ -5841,8 +5963,8 @@ <h3 class="heading settled" data-level="10.1" id="sctn-appid-extension"><span cl
      <p>None.</p>
    </dl>
    <h3 class="heading settled" data-level="10.2" id="sctn-appid-exclude-extension"><span class="secno">10.2. </span><span class="content">FIDO AppID Exclusion Extension (appidExclude)</span><a class="self-link" href="#sctn-appid-exclude-extension"></a></h3>
-   <p>This registration extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③④">WebAuthn Relying Parties</a> to exclude authenticators that contain specified credentials that were created with the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi">[FIDOU2FJavaScriptAPI]</a>.</p>
-   <p>During a transition from the FIDO U2F JavaScript API, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑤">Relying Party</a> may have a population of users with legacy credentials already registered. The <a href="#sctn-appid-extension">appid</a> extension allows the sign-in flow to be transitioned smoothly but, when transitioning the registration flow, the <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑤">excludeCredentials</a> field will not be effective in excluding authenticators with legacy credentials because its contents are taken to be WebAuthn credentials. This extension directs <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑦">client platforms</a> to consider the contents of <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑥">excludeCredentials</a> as both WebAuthn and legacy FIDO credentials. Note that U2F key handles commonly use <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⓪">base64url encoding</a> but must be decoded to their binary form when used in <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑦">excludeCredentials</a>.</p>
+   <p>This registration extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑥">WebAuthn Relying Parties</a> to exclude authenticators that contain specified credentials that were created with the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi">[FIDOU2FJavaScriptAPI]</a>.</p>
+   <p>During a transition from the FIDO U2F JavaScript API, a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑥">Relying Party</a> may have a population of users with legacy credentials already registered. The <a href="#sctn-appid-extension">appid</a> extension allows the sign-in flow to be transitioned smoothly but, when transitioning the registration flow, the <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑤">excludeCredentials</a> field will not be effective in excluding authenticators with legacy credentials because its contents are taken to be WebAuthn credentials. This extension directs <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑦">client platforms</a> to consider the contents of <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑥">excludeCredentials</a> as both WebAuthn and legacy FIDO credentials. Note that U2F key handles commonly use <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①④">base64url encoding</a> but must be decoded to their binary form when used in <a href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials⑦">excludeCredentials</a>.</p>
    <dl>
     <dt data-md>Extension identifier
     <dd data-md>
@@ -5872,7 +5994,7 @@ <h3 class="heading settled" data-level="10.2" id="sctn-appid-exclude-extension">
         <li data-md>
          <p>Pass <var>facetId</var> and <var>appId</var> to the FIDO algorithm for <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-appid-and-facets-v2.0-id-20180227.html#determining-if-a-caller-s-facetid-is-authorized-for-an-appid" id="ref-for-determining-if-a-caller-s-facetid-is-authorized-for-an-appid③">determining if a caller’s
 FacetID is authorized for an AppID</a>. If the latter algorithm rejects <var>appId</var> then
-return a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror⑤">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑧">DOMException</a></code> and terminate the <a href="#sctn-createCredential">creating a new credential</a> algorithm as well as these steps.</p>
+return a "<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#securityerror" id="ref-for-securityerror⑤">SecurityError</a></code>" <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⓪">DOMException</a></code> and terminate the <a href="#sctn-createCredential">creating a new credential</a> algorithm as well as these steps.</p>
          <p class="note" role="note"><span>Note:</span> In practice, several implementations do not implement steps four and onward of the algorithm for <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-appid-and-facets-v2.0-id-20180227.html#determining-if-a-caller-s-facetid-is-authorized-for-an-appid" id="ref-for-determining-if-a-caller-s-facetid-is-authorized-for-an-appid④">determining if a caller’s FacetID is authorized for an AppID</a>. Instead, in step three, the comparison on the host is relaxed to accept hosts on the <a data-link-type="dfn" href="https://url.spec.whatwg.org/#host-same-site" id="ref-for-host-same-site②">same site</a>.</p>
         <li data-md>
          <p>Otherwise, continue with normal processing.</p>
@@ -5917,7 +6039,7 @@ <h3 class="heading settled" data-level="10.2" id="sctn-appid-exclude-extension">
      </ol>
     <dt data-md>Client extension output
     <dd data-md>
-     <p>Returns the value <code>true</code> to indicate to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑥">Relying Party</a> that the extension was acted upon.</p>
+     <p>Returns the value <code>true</code> to indicate to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑦">Relying Party</a> that the extension was acted upon.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticationextensionsclientoutputs" id="ref-for-dictdef-authenticationextensionsclientoutputs⑥"><c- g>AuthenticationExtensionsClientOutputs</c-></a> {
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑥"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationExtensionsClientOutputs" data-dfn-type="dict-member" data-export data-type="boolean " id="dom-authenticationextensionsclientoutputs-appidexclude"><code><c- g>appidExclude</c-></code><a class="self-link" href="#dom-authenticationextensionsclientoutputs-appidexclude"></a></dfn>;
 };
@@ -5943,7 +6065,7 @@ <h3 class="heading settled" data-level="10.3" id="sctn-uvm-extension"><span clas
      <p><a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension⑨">Registration</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension⑨">Authentication</a></p>
     <dt data-md>Client extension input
     <dd data-md>
-     <p>The Boolean value <code>true</code> to indicate that this extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑦">Relying Party</a>.</p>
+     <p>The Boolean value <code>true</code> to indicate that this extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑧">Relying Party</a>.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs⑧"><c- g>AuthenticationExtensionsClientInputs</c-></a> {
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑦"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationExtensionsClientInputs" data-dfn-type="dict-member" data-export data-type="boolean " id="dom-authenticationextensionsclientinputs-uvm"><code><c- g>uvm</c-></code><a class="self-link" href="#dom-authenticationextensionsclientinputs-uvm"></a></dfn>;
 };
@@ -5954,8 +6076,8 @@ <h3 class="heading settled" data-level="10.3" id="sctn-uvm-extension"><span clas
     <dt data-md>Client extension output
     <dd data-md>
      <p>Returns a JSON array of 3-element arrays of numbers that encodes the factors in the authenticator extension output.</p>
-<pre class="idl highlight def"><c- b>typedef</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑤"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long④"><c- b>unsigned</c-> <c- b>long</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-uvmentry"><code><c- g>UvmEntry</c-></code></dfn>;
-<c- b>typedef</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑥"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-uvmentry" id="ref-for-typedefdef-uvmentry"><c- n>UvmEntry</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-uvmentries"><code><c- g>UvmEntries</c-></code></dfn>;
+<pre class="idl highlight def"><c- b>typedef</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①⓪"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥"><c- b>unsigned</c-> <c- b>long</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-uvmentry"><code><c- g>UvmEntry</c-></code></dfn>;
+<c- b>typedef</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①①"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-uvmentry" id="ref-for-typedefdef-uvmentry"><c- n>UvmEntry</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-uvmentries"><code><c- g>UvmEntries</c-></code></dfn>;
 
 <c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticationextensionsclientoutputs" id="ref-for-dictdef-authenticationextensionsclientoutputs⑦"><c- g>AuthenticationExtensionsClientOutputs</c-></a> {
   <a data-link-type="idl-name" href="#typedefdef-uvmentries" id="ref-for-typedefdef-uvmentries"><c- n>UvmEntries</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationExtensionsClientOutputs" data-dfn-type="dict-member" data-export data-type="UvmEntries " id="dom-authenticationextensionsclientoutputs-uvm"><code><c- g>uvm</c-></code><a class="self-link" href="#dom-authenticationextensionsclientoutputs-uvm"></a></dfn>;
@@ -6023,7 +6145,7 @@ <h3 class="heading settled" data-level="10.3" id="sctn-uvm-extension"><span clas
 </pre>
    </dl>
    <h3 class="heading settled" data-level="10.4" id="sctn-authenticator-credential-properties-extension"><span class="secno">10.4. </span><span class="content">Credential Properties Extension (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="credprops">credProps</dfn>)</span><a class="self-link" href="#sctn-authenticator-credential-properties-extension"></a></h3>
-   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑦">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⓪">registration extension</a> facilitates reporting certain <a data-link-type="dfn" href="#credential-properties" id="ref-for-credential-properties②">credential properties</a> known by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑧">client</a> to the requesting <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑤">WebAuthn Relying Party</a> upon creation of a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④①">public key credential source</a> as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①②">registration ceremony</a>.</p>
+   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑦">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⓪">registration extension</a> facilitates reporting certain <a data-link-type="dfn" href="#credential-properties" id="ref-for-credential-properties②">credential properties</a> known by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑤">client</a> to the requesting <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑦">WebAuthn Relying Party</a> upon creation of a <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④①">public key credential source</a> as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①②">registration ceremony</a>.</p>
    <p>At this time, one <a data-link-type="dfn" href="#credential-properties" id="ref-for-credential-properties③">credential property</a> is defined: the <a data-link-type="dfn" href="#credentialpropertiesoutput-resident-key-credential-property" id="ref-for-credentialpropertiesoutput-resident-key-credential-property①">resident key credential property</a> (i.e., <a data-link-type="dfn" href="#credentialpropertiesoutput-client-side-discoverable-credential-property" id="ref-for-credentialpropertiesoutput-client-side-discoverable-credential-property">client-side discoverable credential property</a>).</p>
    <dl>
     <dt data-md>Extension identifier
@@ -6034,7 +6156,7 @@ <h3 class="heading settled" data-level="10.4" id="sctn-authenticator-credential-
      <p><a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①①">Registration</a></p>
     <dt data-md>Client extension input
     <dd data-md>
-     <p>The Boolean value <code>true</code> to indicate that this extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑧">Relying Party</a>.</p>
+     <p>The Boolean value <code>true</code> to indicate that this extension is requested by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑨">Relying Party</a>.</p>
 <pre class="idl highlight def"><c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-authenticationextensionsclientinputs" id="ref-for-dictdef-authenticationextensionsclientinputs⑨"><c- g>AuthenticationExtensionsClientInputs</c-></a> {
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑧"><c- b>boolean</c-></a> <dfn class="idl-code" data-dfn-for="AuthenticationExtensionsClientInputs" data-dfn-type="dict-member" data-export data-type="boolean " id="dom-authenticationextensionsclientinputs-credprops"><code><c- g>credProps</c-></code><a class="self-link" href="#dom-authenticationextensionsclientinputs-credprops"></a></dfn>;
 };
@@ -6058,11 +6180,11 @@ <h3 class="heading settled" data-level="10.4" id="sctn-authenticator-credential-
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dict-member" data-export id="dom-credentialpropertiesoutput-rk"><code>rk</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①⓪">boolean</a></span>
        <dd data-md>
         <p>This OPTIONAL property, known abstractly as the <dfn class="dfn-paneled" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dfn" data-noexport id="credentialpropertiesoutput-resident-key-credential-property">resident key credential property</dfn> (i.e., <dfn class="dfn-paneled" data-dfn-for="CredentialPropertiesOutput" data-dfn-type="dfn" data-noexport id="credentialpropertiesoutput-client-side-discoverable-credential-property">client-side discoverable credential property</dfn>),
-is a Boolean value indicating whether the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②①">PublicKeyCredential</a></code> returned as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①③">registration ceremony</a> is a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①④">client-side discoverable credential</a>.
+is a Boolean value indicating whether the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②④">PublicKeyCredential</a></code> returned as a result of a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①③">registration ceremony</a> is a <a data-link-type="dfn" href="#client-side-discoverable-credential" id="ref-for-client-side-discoverable-credential①④">client-side discoverable credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk②">rk</a></code> is <code>true</code>, the credential is a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①②">discoverable credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk③">rk</a></code> is <code>false</code>, the credential is a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①②">server-side credential</a>.
 If <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk④">rk</a></code> is not present, it is not known whether the credential is a <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①③">discoverable credential</a> or a <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①③">server-side credential</a>.</p>
-        <p class="note" role="note"><span>Note:</span> some <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⓪">authenticators</a> create <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①④">discoverable credentials</a> even when not requested by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑧">client platform</a>. Because of this, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑨">client platforms</a> may be forced to omit the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑤">rk</a></code> property because they lack the assurance to be able to set it to <code>false</code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑥⑨">Relying Parties</a> should assume that, if the <code>credProps</code> extension is supported, then <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⓪">client platforms</a> will endeavour to populate the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑥">rk</a></code> property. Therefore a missing <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑦">rk</a></code> indicates that the created credential is most likely a <a data-link-type="dfn" href="#non-discoverable-credential" id="ref-for-non-discoverable-credential③">non-discoverable credential</a>.</p>
+        <p class="note" role="note"><span>Note:</span> some <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⓪">authenticators</a> create <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①④">discoverable credentials</a> even when not requested by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑧">client platform</a>. Because of this, <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform④⑨">client platforms</a> may be forced to omit the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑤">rk</a></code> property because they lack the assurance to be able to set it to <code>false</code>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⓪">Relying Parties</a> should assume that, if the <code>credProps</code> extension is supported, then <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤⓪">client platforms</a> will endeavour to populate the <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑥">rk</a></code> property. Therefore a missing <code class="idl"><a data-link-type="idl" href="#dom-credentialpropertiesoutput-rk" id="ref-for-dom-credentialpropertiesoutput-rk⑦">rk</a></code> indicates that the created credential is most likely a <a data-link-type="dfn" href="#non-discoverable-credential" id="ref-for-non-discoverable-credential③">non-discoverable credential</a>.</p>
       </dl>
      </div>
     <dt data-md>Authenticator extension input
@@ -6076,9 +6198,9 @@ <h3 class="heading settled" data-level="10.4" id="sctn-authenticator-credential-
      <p>None.</p>
    </dl>
    <h3 class="heading settled" data-level="10.5" id="sctn-large-blob-extension"><span class="secno">10.5. </span><span class="content">Large blob storage extension (<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="largeblob">largeBlob</dfn>)</span><a class="self-link" href="#sctn-large-blob-extension"></a></h3>
-   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑧">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①②">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⓪">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⓪">Relying Party</a> to store opaque data associated with a credential. Since <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②①">authenticators</a> can only store small amounts of data, and most <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦①">Relying Parties</a> are online services that can store arbitrary amounts of state for a user, this is only useful in specific cases. For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦②">Relying Party</a> might wish to issue certificates rather than run a centralised authentication service.</p>
-   <p class="note" role="note"><span>Note:</span> <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦③">Relying Parties</a> can assume that the opaque data will be compressed when being written to a space-limited device and so need not compress it themselves.</p>
-   <p>Since a certificate system needs to sign over the public key of the credential, and that public key is only available after creation, this extension does not add an ability to write blobs in the <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①③">registration</a> context. However, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦④">Relying Parties</a> SHOULD use the <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①④">registration extension</a> when creating the credential if they wish to later use the <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①①">authentication extension</a>.</p>
+   <p>This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑧">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①②">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⓪">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦①">Relying Party</a> to store opaque data associated with a credential. Since <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②①">authenticators</a> can only store small amounts of data, and most <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦②">Relying Parties</a> are online services that can store arbitrary amounts of state for a user, this is only useful in specific cases. For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦③">Relying Party</a> might wish to issue certificates rather than run a centralised authentication service.</p>
+   <p class="note" role="note"><span>Note:</span> <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦④">Relying Parties</a> can assume that the opaque data will be compressed when being written to a space-limited device and so need not compress it themselves.</p>
+   <p>Since a certificate system needs to sign over the public key of the credential, and that public key is only available after creation, this extension does not add an ability to write blobs in the <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①③">registration</a> context. However, <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑤">Relying Parties</a> SHOULD use the <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①④">registration extension</a> when creating the credential if they wish to later use the <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①①">authentication extension</a>.</p>
    <p>Since certificates are sizable relative to the storage capabilities of typical authenticators, user agents SHOULD consider what indications and confirmations are suitable to best guide the user in allocating this limited resource and prevent abuse.</p>
    <p class="note" role="note"><span>Note:</span> In order to interoperate, user agents storing large blobs on authenticators using <a data-link-type="biblio" href="#biblio-fido-ctap">[FIDO-CTAP]</a> are expected to use the provisions detailed in that specification for storing <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#large-blob" id="ref-for-large-blob">large, per-credential blobs</a>.</p>
    <p class="note" role="note"><span>Note:</span> <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②④">Roaming authenticators</a> that use <a data-link-type="biblio" href="#biblio-fido-ctap">[FIDO-CTAP]</a> as their cross-platform transport protocol only support this <a data-link-type="dfn">Large Blob</a> extension for <a data-link-type="dfn" href="#discoverable-credential" id="ref-for-discoverable-credential①⑤">discoverable credentials</a>,
@@ -6103,22 +6225,22 @@ <h3 class="heading settled" data-level="10.5" id="sctn-large-blob-extension"><sp
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationextensionslargeblobinputs"><code><c- g>AuthenticationExtensionsLargeBlobInputs</c-></code></dfn> {
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑧"><c- b>DOMString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="DOMString " href="#dom-authenticationextensionslargeblobinputs-support" id="ref-for-dom-authenticationextensionslargeblobinputs-support"><c- g>support</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤⑤"><c- b>DOMString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="DOMString " href="#dom-authenticationextensionslargeblobinputs-support" id="ref-for-dom-authenticationextensionslargeblobinputs-support"><c- g>support</c-></a>;
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①①"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="boolean " href="#dom-authenticationextensionslargeblobinputs-read" id="ref-for-dom-authenticationextensionslargeblobinputs-read"><c- g>read</c-></a>;
     <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource①⓪"><c- n>BufferSource</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="BufferSource " href="#dom-authenticationextensionslargeblobinputs-write" id="ref-for-dom-authenticationextensionslargeblobinputs-write"><c- g>write</c-></a>;
 };
 </pre>
      <div>
       <dl>
-       <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargeblobinputs-support"><code>support</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③⑨">DOMString</a></span>
+       <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargeblobinputs-support"><code>support</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑤⑥">DOMString</a></span>
        <dd data-md>
         <p>A DOMString that takes one of the values of <code class="idl"><a data-link-type="idl" href="#enumdef-largeblobsupport" id="ref-for-enumdef-largeblobsupport">LargeBlobSupport</a></code>. (See <a href="#sct-domstring-backwards-compatibility">§ 2.1.1 Enumerations as DOMString types</a>.) Only valid during <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑥">registration</a>.</p>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargeblobinputs-read"><code>read</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①②">boolean</a></span>
        <dd data-md>
-        <p>A boolean that indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑤">Relying Party</a> would like to fetch the previously-written blob associated with the asserted credential. Only valid during <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①③">authentication</a>.</p>
+        <p>A boolean that indicates that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑥">Relying Party</a> would like to fetch the previously-written blob associated with the asserted credential. Only valid during <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①③">authentication</a>.</p>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargeblobinputs-write"><code>write</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#BufferSource" id="ref-for-BufferSource①①">BufferSource</a></span>
        <dd data-md>
-        <p>An opaque byte string that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑥">Relying Party</a> wishes to store with the existing credential. Only valid during <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①④">authentication</a>.</p>
+        <p>An opaque byte string that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑦">Relying Party</a> wishes to store with the existing credential. Only valid during <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①④">authentication</a>.</p>
       </dl>
      </div>
     <dt data-md>Client extension processing (<a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑦">registration</a>)
@@ -6128,7 +6250,7 @@ <h3 class="heading settled" data-level="10.5" id="sctn-large-blob-extension"><sp
        <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-read" id="ref-for-dom-authenticationextensionslargeblobinputs-read①">read</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-write" id="ref-for-dom-authenticationextensionslargeblobinputs-write①">write</a></code> is present:</p>
        <ol>
         <li data-md>
-         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException①⑨">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror③">NotSupportedError</a></code>”.</p>
+         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②①">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror③">NotSupportedError</a></code>”.</p>
        </ol>
       <li data-md>
        <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-support" id="ref-for-dom-authenticationextensionslargeblobinputs-support①">support</a></code> is present and has the value <code class="idl"><a data-link-type="idl" href="#dom-largeblobsupport-required" id="ref-for-dom-largeblobsupport-required">required</a></code>:</p>
@@ -6153,13 +6275,13 @@ <h3 class="heading settled" data-level="10.5" id="sctn-large-blob-extension"><sp
        <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-support" id="ref-for-dom-authenticationextensionslargeblobinputs-support③">support</a></code> is present:</p>
        <ol>
         <li data-md>
-         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②⓪">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror④">NotSupportedError</a></code>”.</p>
+         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②②">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror④">NotSupportedError</a></code>”.</p>
        </ol>
       <li data-md>
        <p>If both <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-read" id="ref-for-dom-authenticationextensionslargeblobinputs-read②">read</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-write" id="ref-for-dom-authenticationextensionslargeblobinputs-write②">write</a></code> are present:</p>
        <ol>
         <li data-md>
-         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②①">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑤">NotSupportedError</a></code>”.</p>
+         <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②③">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑤">NotSupportedError</a></code>”.</p>
        </ol>
       <li data-md>
        <p>If <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-read" id="ref-for-dom-authenticationextensionslargeblobinputs-read③">read</a></code> is present and has the value <code>true</code>:</p>
@@ -6179,7 +6301,7 @@ <h3 class="heading settled" data-level="10.5" id="sctn-large-blob-extension"><sp
          <p>If <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials①⑨">allowCredentials</a></code> does not contain exactly one element:</p>
          <ol>
           <li data-md>
-           <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②②">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑥">NotSupportedError</a></code>”.</p>
+           <p>Return a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMException" id="ref-for-idl-DOMException②④">DOMException</a></code> whose name is “<code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#notsupportederror" id="ref-for-notsupportederror⑥">NotSupportedError</a></code>”.</p>
          </ol>
         <li data-md>
          <p>If the <a href="#sctn-getAssertion">assertion</a> operation is successful, attempt to store the contents of <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-write" id="ref-for-dom-authenticationextensionslargeblobinputs-write④">write</a></code> on the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②③">authenticator</a>, associated with the indicated credential.</p>
@@ -6195,7 +6317,7 @@ <h3 class="heading settled" data-level="10.5" id="sctn-large-blob-extension"><sp
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationextensionslargebloboutputs"><code><c- g>AuthenticationExtensionsLargeBlobOutputs</c-></code></dfn> {
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①③"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="boolean " href="#dom-authenticationextensionslargebloboutputs-supported" id="ref-for-dom-authenticationextensionslargebloboutputs-supported②"><c- g>supported</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②④"><c- b>ArrayBuffer</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="ArrayBuffer " href="#dom-authenticationextensionslargebloboutputs-blob" id="ref-for-dom-authenticationextensionslargebloboutputs-blob②"><c- g>blob</c-></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②⑦"><c- b>ArrayBuffer</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="ArrayBuffer " href="#dom-authenticationextensionslargebloboutputs-blob" id="ref-for-dom-authenticationextensionslargebloboutputs-blob②"><c- g>blob</c-></a>;
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①④"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="boolean " href="#dom-authenticationextensionslargebloboutputs-written" id="ref-for-dom-authenticationextensionslargebloboutputs-written①"><c- g>written</c-></a>;
 };
 </pre>
@@ -6204,7 +6326,7 @@ <h3 class="heading settled" data-level="10.5" id="sctn-large-blob-extension"><sp
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobOutputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargebloboutputs-supported"><code>supported</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①⑤">boolean</a></span>
        <dd data-md>
         <p><code>true</code> if, and only if, the created credential supports storing large blobs. Only present in <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑧">registration</a> outputs.</p>
-       <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobOutputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargebloboutputs-blob"><code>blob</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②⑤">ArrayBuffer</a></span>
+       <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobOutputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargebloboutputs-blob"><code>blob</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer" id="ref-for-idl-ArrayBuffer②⑧">ArrayBuffer</a></span>
        <dd data-md>
         <p>The opaque byte string that was associated with the credential identified by <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-rawid" id="ref-for-dom-publickeycredential-rawid③">rawId</a></code>. Only valid if <code class="idl"><a data-link-type="idl" href="#dom-authenticationextensionslargeblobinputs-read" id="ref-for-dom-authenticationextensionslargeblobinputs-read④">read</a></code> was <code>true</code>.</p>
        <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsLargeBlobOutputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionslargebloboutputs-written"><code>written</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①⑥">boolean</a></span>
@@ -6214,7 +6336,7 @@ <h3 class="heading settled" data-level="10.5" id="sctn-large-blob-extension"><sp
      </div>
     <dt data-md>Authenticator extension processing
     <dd data-md>
-     <p><a data-link-type="dfn" href="#largeblob" id="ref-for-largeblob">This extension</a> directs the user-agent to cause the large blob to be stored on, or retrieved from, the authenticator. It thus does not specify any direct authenticator interaction for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑦">Relying Parties</a>.</p>
+     <p><a data-link-type="dfn" href="#largeblob" id="ref-for-largeblob">This extension</a> directs the user-agent to cause the large blob to be stored on, or retrieved from, the authenticator. It thus does not specify any direct authenticator interaction for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑧">Relying Parties</a>.</p>
    </dl>
    <h2 class="heading settled" data-level="11" id="sctn-automation"><span class="secno">11. </span><span class="content">User Agent Automation</span><a class="self-link" href="#sctn-automation"></a></h2>
    <p>For the purposes of user agent automation and <a data-link-type="dfn" href="#web-application" id="ref-for-web-application④">web application</a> testing, this document defines a number of <a data-link-type="biblio" href="#biblio-webdriver">[WebDriver]</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-extension-command" id="ref-for-dfn-extension-command">extension commands</a>.</p>
@@ -6498,7 +6620,7 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
      <tbody>
       <tr>
        <td><var>credentialId</var>
-       <td>The <a data-link-type="dfn" href="#public-key-credential-source-id" id="ref-for-public-key-credential-source-id④">Credential ID</a> encoded using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①①">Base64url Encoding</a>.
+       <td>The <a data-link-type="dfn" href="#public-key-credential-source-id" id="ref-for-public-key-credential-source-id④">Credential ID</a> encoded using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑤">Base64url Encoding</a>.
        <td>string
       <tr>
        <td><var>isResidentCredential</var>
@@ -6510,11 +6632,11 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
        <td>string
       <tr>
        <td><var>privateKey</var>
-       <td> An asymmetric key package containing a single <a data-link-type="dfn" href="#public-key-credential-source-privatekey" id="ref-for-public-key-credential-source-privatekey②">private key</a> per <a data-link-type="biblio" href="#biblio-rfc5958">[RFC5958]</a>, encoded using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①②">Base64url Encoding</a>. 
+       <td> An asymmetric key package containing a single <a data-link-type="dfn" href="#public-key-credential-source-privatekey" id="ref-for-public-key-credential-source-privatekey②">private key</a> per <a data-link-type="biblio" href="#biblio-rfc5958">[RFC5958]</a>, encoded using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑥">Base64url Encoding</a>. 
        <td>string
       <tr>
        <td><var>userHandle</var>
-       <td> The <a data-link-type="dfn" href="#public-key-credential-source-userhandle" id="ref-for-public-key-credential-source-userhandle④">userHandle</a> associated to the credential encoded using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①③">Base64url Encoding</a>. This property may not be defined. 
+       <td> The <a data-link-type="dfn" href="#public-key-credential-source-userhandle" id="ref-for-public-key-credential-source-userhandle④">userHandle</a> associated to the credential encoded using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑦">Base64url Encoding</a>. This property may not be defined. 
        <td>string
       <tr>
        <td><var>signCount</var>
@@ -6522,7 +6644,7 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
        <td>number
       <tr>
        <td><var>largeBlob</var>
-       <td> The <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#large-blob" id="ref-for-large-blob①">large, per-credential blob</a> associated to the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④④">public key credential source</a>, encoded using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①④">Base64url Encoding</a>.
+       <td> The <a data-link-type="dfn" href="https://fidoalliance.org/specs/fido-v2.0-ps-20190130/fido-client-to-authenticator-protocol-v2.0-ps-20190130.html#large-blob" id="ref-for-large-blob①">large, per-credential blob</a> associated to the <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④④">public key credential source</a>, encoded using <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑧">Base64url Encoding</a>.
                     This property may not be defined. 
        <td>string
     </table>
@@ -6533,7 +6655,7 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
      <p>If <var>parameters</var> is not a JSON <a data-link-type="dfn" href="https://w3c.github.io/FileAPI/#blob-url-entry-object" id="ref-for-blob-url-entry-object③">Object</a>, return a <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error" id="ref-for-dfn-error⑧">WebDriver error</a> with <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error-code" id="ref-for-dfn-error-code⑧">WebDriver error code</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-invalid-argument" id="ref-for-dfn-invalid-argument⑦">invalid argument</a>.</p>
      <p class="note" role="note"><span>Note:</span> <var>parameters</var> is a <a data-link-type="dfn" href="#credential-parameters" id="ref-for-credential-parameters">Credential Parameters</a> object.</p>
     <li data-md>
-     <p>Let <var>credentialId</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑤">Base64url Encoding</a> on the <var>parameters</var>’ <var>credentialId</var> property.</p>
+     <p>Let <var>credentialId</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑨">Base64url Encoding</a> on the <var>parameters</var>’ <var>credentialId</var> property.</p>
     <li data-md>
      <p>If <var>credentialId</var> is failure, return a <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error" id="ref-for-dfn-error⑨">WebDriver error</a> with <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error-code" id="ref-for-dfn-error-code⑨">WebDriver error code</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-invalid-argument" id="ref-for-dfn-invalid-argument⑧">invalid argument</a>.</p>
     <li data-md>
@@ -6545,7 +6667,7 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
     <li data-md>
      <p>If <var>rpId</var> is not a valid <a data-link-type="dfn" href="#rp-id" id="ref-for-rp-id④⑥">RP ID</a>, return a <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error" id="ref-for-dfn-error①①">WebDriver error</a> with <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error-code" id="ref-for-dfn-error-code①①">WebDriver error code</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-invalid-argument" id="ref-for-dfn-invalid-argument①⓪">invalid argument</a>.</p>
     <li data-md>
-     <p>Let <var>privateKey</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑥">Base64url Encoding</a> on the <var>parameters</var>’ <var>privateKey</var> property.</p>
+     <p>Let <var>privateKey</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding②⓪">Base64url Encoding</a> on the <var>parameters</var>’ <var>privateKey</var> property.</p>
     <li data-md>
      <p>If <var>privateKey</var> is failure, return a <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error" id="ref-for-dfn-error①②">WebDriver error</a> with <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error-code" id="ref-for-dfn-error-code①②">WebDriver error code</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-invalid-argument" id="ref-for-dfn-invalid-argument①①">invalid argument</a>.</p>
     <li data-md>
@@ -6555,7 +6677,7 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
      <p>If the <var>parameters</var>’ <var>userHandle</var> property is defined:</p>
      <ol>
       <li data-md>
-       <p>Let <var>userHandle</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑦">Base64url Encoding</a> on the <var>parameters</var>’ <var>userHandle</var> property.</p>
+       <p>Let <var>userHandle</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding②①">Base64url Encoding</a> on the <var>parameters</var>’ <var>userHandle</var> property.</p>
       <li data-md>
        <p>If <var>userHandle</var> is failure, return a <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error" id="ref-for-dfn-error①④">WebDriver error</a> with <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error-code" id="ref-for-dfn-error-code①④">WebDriver error code</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-invalid-argument" id="ref-for-dfn-invalid-argument①③">invalid argument</a>.</p>
      </ol>
@@ -6578,7 +6700,7 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
      <p>If the <var>authenticator</var> supports the <a data-link-type="dfn" href="#largeblob" id="ref-for-largeblob②">largeBlob</a> extension and the <var>parameters</var>’ <var>largeBlob</var> feature is defined:</p>
      <ol>
       <li data-md>
-       <p>Let <var>largeBlob</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding①⑧">Base64url Encoding</a> on the <var>parameters</var>’ <var>largeBlob</var> property.</p>
+       <p>Let <var>largeBlob</var> be the result of decoding <a data-link-type="dfn" href="#base64url-encoding" id="ref-for-base64url-encoding②②">Base64url Encoding</a> on the <var>parameters</var>’ <var>largeBlob</var> property.</p>
       <li data-md>
        <p>If <var>largeBlob</var> is failure, return a <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error" id="ref-for-dfn-error①⑧">WebDriver error</a> with <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-error-code" id="ref-for-dfn-error-code①⑧">WebDriver error code</a> <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-invalid-argument" id="ref-for-dfn-invalid-argument①⑦">invalid argument</a>.</p>
      </ol>
@@ -6618,7 +6740,7 @@ <h3 class="heading settled" data-level="11.5" id="sctn-automation-add-credential
    </ol>
    <h3 class="heading settled" data-level="11.6" id="sctn-automation-get-credentials"><span class="secno">11.6. </span><span class="content"><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="get-credentials">Get Credentials</dfn></span><a class="self-link" href="#sctn-automation-get-credentials"></a></h3>
    <p>The <a data-link-type="dfn" href="#get-credentials" id="ref-for-get-credentials">Get Credentials</a> WebDriver <a data-link-type="dfn" href="https://w3c.github.io/webdriver/#dfn-extension-command" id="ref-for-dfn-extension-command⑥">extension command</a> returns one <a data-link-type="dfn" href="#credential-parameters" id="ref-for-credential-parameters①">Credential Parameters</a> object for every <a data-link-type="dfn" href="#public-key-credential-source" id="ref-for-public-key-credential-source④⑤">Public Key Credential Source</a> stored in a <a data-link-type="dfn" href="#virtual-authenticators" id="ref-for-virtual-authenticators②⓪">Virtual Authenticator</a>, regardless of whether they were
-stored using <a data-link-type="dfn" href="#add-credential" id="ref-for-add-credential①">Add Credential</a> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③①">navigator.credentials.create()</a></code>. It is defined as follows:</p>
+stored using <a data-link-type="dfn" href="#add-credential" id="ref-for-add-credential①">Add Credential</a> or <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-create" id="ref-for-dom-credentialscontainer-create③②">navigator.credentials.create()</a></code>. It is defined as follows:</p>
    <figure class="table" id="table-getCredentials">
     <table class="data">
      <thead>
@@ -6790,7 +6912,7 @@ <h3 class="heading settled" data-level="12.3" id="sctn-extensions-reg-update"><s
     <li data-md>
      <p>WebAuthn Extension Identifier: appid</p>
     <li data-md>
-     <p>Description: This <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑥">authentication extension</a> allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑥">WebAuthn Relying Parties</a> that have previously registered a credential using the legacy
+     <p>Description: This <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑥">authentication extension</a> allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑧">WebAuthn Relying Parties</a> that have previously registered a credential using the legacy
 FIDO JavaScript APIs to request an assertion.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-appid-extension">§ 10.1 FIDO AppID Extension (appid)</a> of this specification <br><br></p>
@@ -6798,7 +6920,7 @@ <h3 class="heading settled" data-level="12.3" id="sctn-extensions-reg-update"><s
      <p>WebAuthn Extension Identifier: uvm</p>
     <li data-md>
      <p>Description: This <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension①⑨">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑦">authentication extension</a> enables use of a user verification method.
-The user verification method extension returns to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑦">WebAuthn Relying Party</a> which user verification methods (factors) were
+The user verification method extension returns to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑨">WebAuthn Relying Party</a> which user verification methods (factors) were
 used for the WebAuthn operation.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-uvm-extension">§ 10.3 User Verification Method Extension (uvm)</a> of this specification</p>
@@ -6809,60 +6931,60 @@ <h3 class="heading settled" data-level="12.4" id="sctn-extensions-reg"><span cla
     <li data-md>
      <p>WebAuthn Extension Identifier: appidExclude</p>
     <li data-md>
-     <p>Description: This registration extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑧">WebAuthn Relying Parties</a> to exclude authenticators that contain specified credentials that were created with the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi">[FIDOU2FJavaScriptAPI]</a>.</p>
+     <p>Description: This registration extension allows <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⓪">WebAuthn Relying Parties</a> to exclude authenticators that contain specified credentials that were created with the legacy FIDO U2F JavaScript API <a data-link-type="biblio" href="#biblio-fidou2fjavascriptapi">[FIDOU2FJavaScriptAPI]</a>.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-appid-exclude-extension">§ 10.2 FIDO AppID Exclusion Extension (appidExclude)</a> of this specification <br><br></p>
     <li data-md>
      <p>WebAuthn Extension Identifier: credProps</p>
     <li data-md>
      <p>Description: This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension⑨">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②⓪">registration extension</a> enables reporting of a newly-created <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑦">credential</a>'s properties,
-as determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑦⑨">client</a>, to the calling <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party③⑨">WebAuthn Relying Party</a>'s <a data-link-type="dfn" href="#web-application" id="ref-for-web-application⑤">web application</a>.</p>
+as determined by the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑥">client</a>, to the calling <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④①">WebAuthn Relying Party</a>'s <a data-link-type="dfn" href="#web-application" id="ref-for-web-application⑤">web application</a>.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-authenticator-credential-properties-extension">§ 10.4 Credential Properties Extension (credProps)</a> of this specification <br><br></p>
     <li data-md>
      <p>WebAuthn Extension Identifier: largeBlob</p>
     <li data-md>
-     <p>Description: This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①⓪">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②①">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑧">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑧">Relying Party</a> to store opaque data associated with a credential.</p>
+     <p>Description: This <a data-link-type="dfn" href="#client-extension" id="ref-for-client-extension①⓪">client</a> <a data-link-type="dfn" href="#registration-extension" id="ref-for-registration-extension②①">registration extension</a> and <a data-link-type="dfn" href="#authentication-extension" id="ref-for-authentication-extension①⑧">authentication extension</a> allows a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑨">Relying Party</a> to store opaque data associated with a credential.</p>
     <li data-md>
      <p>Specification Document: Section <a href="#sctn-large-blob-extension">§ 10.5 Large blob storage extension (largeBlob)</a> of this specification</p>
    </ul>
    <h2 class="heading settled" data-level="13" id="sctn-security-considerations"><span class="secno">13. </span><span class="content">Security Considerations</span><a class="self-link" href="#sctn-security-considerations"></a></h2>
    <p>This specification defines a <a href="#sctn-api">Web API</a> and a cryptographic peer-entity authentication protocol.
 The <a data-link-type="dfn" href="#web-authentication-api" id="ref-for-web-authentication-api①⑤">Web Authentication API</a> allows Web developers (i.e., "authors") to utilize the Web Authentication protocol in their <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑧">registration</a> and <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①④">authentication</a> <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①①">ceremonies</a>.
-The entities comprising the Web Authentication protocol endpoints are user-controlled <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑦">WebAuthn Authenticators</a> and a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⓪">WebAuthn Relying Party</a>'s
-computing environment hosting the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑦⑨">Relying Party</a>'s <a data-link-type="dfn" href="#web-application" id="ref-for-web-application⑥">web application</a>.
-In this model, the user agent, together with the <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑦">WebAuthn Client</a>, comprise an intermediary between <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑤">authenticators</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⓪">Relying Parties</a>.
-Additionally, <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑥">authenticators</a> can <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②⓪">attest</a> to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧①">Relying Parties</a> as to their provenance.</p>
+The entities comprising the Web Authentication protocol endpoints are user-controlled <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator⑦">WebAuthn Authenticators</a> and a <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④②">WebAuthn Relying Party</a>'s
+computing environment hosting the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⓪">Relying Party</a>'s <a data-link-type="dfn" href="#web-application" id="ref-for-web-application⑥">web application</a>.
+In this model, the user agent, together with the <a data-link-type="dfn" href="#webauthn-client" id="ref-for-webauthn-client⑦">WebAuthn Client</a>, comprise an intermediary between <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑤">authenticators</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧①">Relying Parties</a>.
+Additionally, <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑥">authenticators</a> can <a data-link-type="dfn" href="#attestation" id="ref-for-attestation②⓪">attest</a> to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧②">Relying Parties</a> as to their provenance.</p>
    <p>At this time, this specification does not feature detailed security considerations. However, the <a data-link-type="biblio" href="#biblio-fidosecref">[FIDOSecRef]</a> document provides a security analysis which is overall applicable to this specification.
 Also, the <a data-link-type="biblio" href="#biblio-fidoauthnrsecreqs">[FIDOAuthnrSecReqs]</a> document suite provides useful information about <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑦">authenticator</a> security characteristics.</p>
    <p>The below subsections comprise the current Web Authentication-specific security considerations.
 They are divided by audience;
 general security considerations are direct subsections of this section,
-while security considerations specifically for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑧">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑧⓪">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧②">Relying Party</a> implementers
+while security considerations specifically for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑧">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑦">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧③">Relying Party</a> implementers
 are grouped into respective subsections.</p>
    <h3 class="heading settled" data-level="13.1" id="sctn-credentialIdSecurity"><span class="secno">13.1. </span><span class="content">Credential ID Unsigned</span><a class="self-link" href="#sctn-credentialIdSecurity"></a></h3>
    <p>The <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑥">credential ID</a> is not signed.
 This is not a problem because all that would happen if an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②②⑨">authenticator</a> returns
-the wrong <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑦">credential ID</a>, or if an attacker intercepts and manipulates the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑧">credential ID</a>, is that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④①">WebAuthn Relying Party</a> would not look up the correct <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑤">credential public key</a> with which to verify the returned signed <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④⑧">authenticator data</a> (a.k.a., <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑤">assertion</a>), and thus the interaction would end in an error.</p>
+the wrong <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑦">credential ID</a>, or if an attacker intercepts and manipulates the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑧">credential ID</a>, is that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④③">WebAuthn Relying Party</a> would not look up the correct <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑤">credential public key</a> with which to verify the returned signed <a data-link-type="dfn" href="#authenticator-data" id="ref-for-authenticator-data④⑧">authenticator data</a> (a.k.a., <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑤">assertion</a>), and thus the interaction would end in an error.</p>
    <h3 class="heading settled" data-level="13.2" id="sctn-client-authenticator-proximity"><span class="secno">13.2. </span><span class="content">Physical Proximity between Client and Authenticator</span><a class="self-link" href="#sctn-client-authenticator-proximity"></a></h3>
-   <p>In the WebAuthn <a data-link-type="dfn" href="#authenticator-model" id="ref-for-authenticator-model④">authenticator model</a>, it is generally assumed that <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑤">roaming authenticators</a> are physically close to, and communicate directly with, the <a data-link-type="dfn" href="#client" id="ref-for-client⑧①">client</a>.
+   <p>In the WebAuthn <a data-link-type="dfn" href="#authenticator-model" id="ref-for-authenticator-model④">authenticator model</a>, it is generally assumed that <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑤">roaming authenticators</a> are physically close to, and communicate directly with, the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑧">client</a>.
 This arrangement has some important advantages.</p>
-   <p>The promise of physical proximity between <a data-link-type="dfn" href="#client" id="ref-for-client⑧②">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⓪">authenticator</a> is a key strength of a <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②①">something you have</a> <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②②">authentication factor</a>.
+   <p>The promise of physical proximity between <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑨">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⓪">authenticator</a> is a key strength of a <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②①">something you have</a> <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②②">authentication factor</a>.
 For example, if a <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑥">roaming authenticator</a> can communicate only via USB or Bluetooth,
 the limited range of these transports ensures that any malicious actor
 must physically be within that range in order to interact with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③①">authenticator</a>.
 This is not necessarily true of an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③②">authenticator</a> that can be invoked remotely —
 even if the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③③">authenticator</a> verifies <a data-link-type="dfn" href="#concept-user-present" id="ref-for-concept-user-present⑥">user presence</a>,
 users can be tricked into authorizing remotely initiated malicious requests.</p>
-   <p>Direct communication between <a data-link-type="dfn" href="#client" id="ref-for-client⑧③">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③④">authenticator</a> means the <a data-link-type="dfn" href="#client" id="ref-for-client⑧④">client</a> can enforce the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⓪">scope</a> restrictions for <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑧">credentials</a>.
-By contrast, if the communication between <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑤">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑤">authenticator</a> is mediated by some third party,
-then the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑥">client</a> has to trust the third party to
+   <p>Direct communication between <a data-link-type="dfn" href="#client" id="ref-for-client⑨⓪">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③④">authenticator</a> means the <a data-link-type="dfn" href="#client" id="ref-for-client⑨①">client</a> can enforce the <a data-link-type="dfn" href="#scope" id="ref-for-scope②⓪">scope</a> restrictions for <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential①⑧">credentials</a>.
+By contrast, if the communication between <a data-link-type="dfn" href="#client" id="ref-for-client⑨②">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑤">authenticator</a> is mediated by some third party,
+then the <a data-link-type="dfn" href="#client" id="ref-for-client⑨③">client</a> has to trust the third party to
 enforce the <a data-link-type="dfn" href="#scope" id="ref-for-scope②①">scope</a> restrictions and control access to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑥">authenticator</a>.
 Failure to do either could result in
-a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧③">Relying Party</a> receiving <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①④">authentication assertions</a> valid for other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧④">Relying Parties</a>,
+a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧④">Relying Party</a> receiving <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①④">authentication assertions</a> valid for other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑤">Relying Parties</a>,
 or in a malicious user gaining access to <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑤">authentication assertions</a> for other users.</p>
-   <p>If designing a solution where the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑦">authenticator</a> does not need to be physically close to the <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑦">client</a>,
-or where <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑧">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑧">authenticator</a> do not communicate directly,
+   <p>If designing a solution where the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑦">authenticator</a> does not need to be physically close to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨④">client</a>,
+or where <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑤">client</a> and <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑧">authenticator</a> do not communicate directly,
 designers SHOULD consider how this affects the enforcement of <a data-link-type="dfn" href="#scope" id="ref-for-scope②②">scope</a> restrictions
 and the strength of the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②③⑨">authenticator</a> as a <a data-link-type="dfn" href="https://pages.nist.gov/800-63-3/sp800-63-3.html#af" id="ref-for-af②③">something you have</a> authentication factor.</p>
    <h3 class="heading settled" data-level="13.3" id="sctn-security-considerations-authenticator"><span class="secno">13.3. </span><span class="content">Security considerations for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⓪">authenticators</a> <span id="sctn-attestation-security-considerations"></span></span><a class="self-link" href="#sctn-security-considerations-authenticator"></a></h3>
@@ -6875,41 +6997,41 @@ <h4 class="heading settled" data-level="13.3.1" id="sctn-cert-hierarchy"><span c
    <h4 class="heading settled" data-level="13.3.2" id="sctn-ca-compromise"><span class="secno">13.3.2. </span><span class="content">Attestation Certificate and Attestation Certificate CA Compromise</span><a class="self-link" href="#sctn-ca-compromise"></a></h4>
    <p>When an intermediate CA or a root CA used for issuing attestation certificates is compromised, <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⓪">WebAuthn Authenticator</a> <a data-link-type="dfn" href="#attestation-key-pair" id="ref-for-attestation-key-pair⑥">attestation key pairs</a> are still safe although their certificates can no longer be trusted. A <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①①">WebAuthn Authenticator</a> manufacturer that
 has recorded the <a data-link-type="dfn" href="#attestation-public-key" id="ref-for-attestation-public-key①">attestation public keys</a> for their <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④①">authenticator</a> models can issue new <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate⑨">attestation certificates</a> for these keys from a new
-intermediate CA or from a new root CA. If the root CA changes, the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④②">WebAuthn Relying Parties</a> MUST update their trusted root certificates
+intermediate CA or from a new root CA. If the root CA changes, the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④④">WebAuthn Relying Parties</a> MUST update their trusted root certificates
 accordingly.</p>
    <p>A <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①②">WebAuthn Authenticator</a> <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①⓪">attestation certificate</a> MUST be revoked by the issuing CA if its <a data-link-type="dfn" href="#attestation-private-key" id="ref-for-attestation-private-key④">private key</a> has been compromised. A WebAuthn
 Authenticator manufacturer may need to ship a firmware update and inject new <a data-link-type="dfn" href="#attestation-private-key" id="ref-for-attestation-private-key⑤">attestation private keys</a> and <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①①">certificates</a> into already
 manufactured <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①③">WebAuthn Authenticators</a>, if the exposure was due to a firmware flaw. (The process by which this happens is out of
 scope for this specification.) If the <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①④">WebAuthn Authenticator</a> manufacturer does not have this capability, then it may not be
-possible for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑤">Relying Parties</a> to trust any further <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑦">attestation statements</a> from the affected <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⑤">WebAuthn Authenticators</a>.</p>
-   <p>See also the related security consideration for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑥">Relying Parties</a> in <a href="#sctn-revoked-attestation-certificates">§ 13.4.5 Revoked Attestation Certificates</a>.</p>
-   <h3 class="heading settled" data-level="13.4" id="sctn-security-considerations-rp"><span class="secno">13.4. </span><span class="content">Security considerations for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑦">Relying Parties</a></span><a class="self-link" href="#sctn-security-considerations-rp"></a></h3>
+possible for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑥">Relying Parties</a> to trust any further <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑦">attestation statements</a> from the affected <a data-link-type="dfn" href="#webauthn-authenticator" id="ref-for-webauthn-authenticator①⑤">WebAuthn Authenticators</a>.</p>
+   <p>See also the related security consideration for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑦">Relying Parties</a> in <a href="#sctn-revoked-attestation-certificates">§ 13.4.5 Revoked Attestation Certificates</a>.</p>
+   <h3 class="heading settled" data-level="13.4" id="sctn-security-considerations-rp"><span class="secno">13.4. </span><span class="content">Security considerations for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑧">Relying Parties</a></span><a class="self-link" href="#sctn-security-considerations-rp"></a></h3>
    <h4 class="heading settled" data-level="13.4.1" id="sctn-rp-benefits"><span class="secno">13.4.1. </span><span class="content">Security Benefits for WebAuthn Relying Parties</span><a class="self-link" href="#sctn-rp-benefits"></a></h4>
-   <p>The main benefits offered to <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④③">WebAuthn Relying Parties</a> by this specification include:</p>
+   <p>The main benefits offered to <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑤">WebAuthn Relying Parties</a> by this specification include:</p>
    <ol>
     <li data-md>
      <p>Users and accounts can be secured using widely compatible, easy-to-use multi-factor authentication.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑧">Relying Party</a> does not need to provision <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④②">authenticator</a> hardware to its users. Instead, each user can independently obtain
-any conforming <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④③">authenticator</a> and use that same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④④">authenticator</a> with any number of <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑨">Relying Parties</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⓪">Relying Party</a> can optionally
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑧⑨">Relying Party</a> does not need to provision <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④②">authenticator</a> hardware to its users. Instead, each user can independently obtain
+any conforming <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④③">authenticator</a> and use that same <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④④">authenticator</a> with any number of <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⓪">Relying Parties</a>. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨①">Relying Party</a> can optionally
 enforce requirements on <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑤">authenticators</a>' security properties by inspecting the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑧">attestation statements</a> returned from the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑥">authenticators</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑥">Authentication ceremonies</a> are resistant to <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186">man-in-the-middle attacks</a>.
 Regarding <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①④">registration ceremonies</a>, see <a href="#sctn-attestation-limitations">§ 13.4.4 Attestation Limitations</a>, below.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨①">Relying Party</a> can automatically support multiple types of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑥">user verification</a> - for example PIN, biometrics and/or future
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨②">Relying Party</a> can automatically support multiple types of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑥">user verification</a> - for example PIN, biometrics and/or future
 methods - with little or no code change, and can let each user decide which they prefer to use via their choice of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑦">authenticator</a>.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨②">Relying Party</a> does not need to store additional secrets in order to gain the above benefits.</p>
+     <p>The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨③">Relying Party</a> does not need to store additional secrets in order to gain the above benefits.</p>
    </ol>
-   <p>As stated in the <a href="#sctn-conforming-relying-parties">Conformance</a> section, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨③">Relying Party</a> MUST behave as described in <a href="#sctn-rp-operations">§ 7 WebAuthn Relying Party Operations</a> to obtain all of the above security benefits. However, one notable use case that departs slightly from this is described below in <a href="#sctn-attestation-limitations">§ 13.4.4 Attestation Limitations</a>.</p>
+   <p>As stated in the <a href="#sctn-conforming-relying-parties">Conformance</a> section, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨④">Relying Party</a> MUST behave as described in <a href="#sctn-rp-operations">§ 7 WebAuthn Relying Party Operations</a> to obtain all of the above security benefits. However, one notable use case that departs slightly from this is described below in <a href="#sctn-attestation-limitations">§ 13.4.4 Attestation Limitations</a>.</p>
    <h4 class="heading settled" data-level="13.4.2" id="sctn-seccons-visibility"><span class="secno">13.4.2. </span><span class="content">Visibility Considerations for Embedded Usage</span><a class="self-link" href="#sctn-seccons-visibility"></a></h4>
-   <p>Simplistic use of WebAuthn in an embedded context, e.g., within <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element④">iframe</a></code>s as described in <a href="#sctn-iframe-guidance">§ 5.10 Using Web Authentication within iframe elements</a>, may make users vulnerable to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ui-redressing">UI Redressing</dfn> attacks, also known as "<a href="https://en.wikipedia.org/wiki/Clickjacking">Clickjacking</a>". This is where an attacker overlays their own UI on top of a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨④">Relying Party</a>'s intended UI and attempts to trick the user into performing unintended actions with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑤">Relying Party</a>. For example, using these techniques, an attacker might be able to trick users into purchasing items, transferring money, etc.</p>
-   <p>Even though WebAuthn-specific UI is typically handled by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤①">client platform</a> and thus is not vulnerable to <a data-link-type="dfn" href="#ui-redressing" id="ref-for-ui-redressing①">UI Redressing</a>, it is likely important for an <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑥">Relying Party</a> having embedded WebAuthn-wielding content to ensure that their content’s UI is visible to the user. An emerging means to do so is by observing the status of the experimental <a href="https://w3c.github.io/IntersectionObserver/v2/">Intersection Observer v2</a>'s <code>isVisible</code> attribute. For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑦">Relying Party</a>'s script running in the embedded context could pre-emptively load itself in a popup window if it detects <code>isVisble</code> being set to <code>false</code>, thus side-stepping any occlusion of their content.</p>
+   <p>Simplistic use of WebAuthn in an embedded context, e.g., within <code><a data-link-type="element" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element" id="ref-for-the-iframe-element④">iframe</a></code>s as described in <a href="#sctn-iframe-guidance">§ 5.10 Using Web Authentication within iframe elements</a>, may make users vulnerable to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ui-redressing">UI Redressing</dfn> attacks, also known as "<a href="https://en.wikipedia.org/wiki/Clickjacking">Clickjacking</a>". This is where an attacker overlays their own UI on top of a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑤">Relying Party</a>'s intended UI and attempts to trick the user into performing unintended actions with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑥">Relying Party</a>. For example, using these techniques, an attacker might be able to trick users into purchasing items, transferring money, etc.</p>
+   <p>Even though WebAuthn-specific UI is typically handled by the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤①">client platform</a> and thus is not vulnerable to <a data-link-type="dfn" href="#ui-redressing" id="ref-for-ui-redressing①">UI Redressing</a>, it is likely important for an <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑦">Relying Party</a> having embedded WebAuthn-wielding content to ensure that their content’s UI is visible to the user. An emerging means to do so is by observing the status of the experimental <a href="https://w3c.github.io/IntersectionObserver/v2/">Intersection Observer v2</a>'s <code>isVisible</code> attribute. For example, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑧">Relying Party</a>'s script running in the embedded context could pre-emptively load itself in a popup window if it detects <code>isVisble</code> being set to <code>false</code>, thus side-stepping any occlusion of their content.</p>
    <h4 class="heading settled" data-level="13.4.3" id="sctn-cryptographic-challenges"><span class="secno">13.4.3. </span><span class="content">Cryptographic Challenges</span><a class="self-link" href="#sctn-cryptographic-challenges"></a></h4>
    <p>As a cryptographic protocol, Web Authentication is dependent upon randomized challenges
-to avoid replay attacks. Therefore, the values of both <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions⑥">PublicKeyCredentialCreationOptions</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge③">challenge</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑦">PublicKeyCredentialRequestOptions</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge④">challenge</a></code> MUST be randomly generated
-by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑧">Relying Parties</a> in an environment they trust (e.g., on the server-side), and the
+to avoid replay attacks. Therefore, the values of both <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialcreationoptions" id="ref-for-dictdef-publickeycredentialcreationoptions①⓪">PublicKeyCredentialCreationOptions</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-challenge" id="ref-for-dom-publickeycredentialcreationoptions-challenge③">challenge</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①①">PublicKeyCredentialRequestOptions</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-challenge" id="ref-for-dom-publickeycredentialrequestoptions-challenge④">challenge</a></code> MUST be randomly generated
+by <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑨">Relying Parties</a> in an environment they trust (e.g., on the server-side), and the
 returned <code class="idl"><a data-link-type="idl" href="#dom-collectedclientdata-challenge" id="ref-for-dom-collectedclientdata-challenge⑧">challenge</a></code> value in the client’s
 response MUST match what was generated. This SHOULD be done in a fashion that does not rely
 upon a client’s behavior, e.g., the Relying Party SHOULD store the challenge temporarily
@@ -6920,53 +7042,53 @@ <h4 class="heading settled" data-level="13.4.3" id="sctn-cryptographic-challenge
    <h4 class="heading settled" data-level="13.4.4" id="sctn-attestation-limitations"><span class="secno">13.4.4. </span><span class="content">Attestation Limitations</span><a class="self-link" href="#sctn-attestation-limitations"></a></h4>
    <p><em>This section is not normative.</em></p>
    <p>When <a href="#sctn-registering-a-new-credential">registering a new credential</a>, the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement③⑨">attestation statement</a>, if present,
-may allow the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④④">WebAuthn Relying Party</a> to derive assurances about various <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑧">authenticator</a> qualities.
+may allow the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑥">WebAuthn Relying Party</a> to derive assurances about various <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑧">authenticator</a> qualities.
 For example, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②④⑨">authenticator</a> model, or how it stores and protects <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②②">credential private keys</a>.
 However, it is important to note that an <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④⓪">attestation statement</a>, on its own,
-provides no means for a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party②⑨⑨">Relying Party</a> to verify that an <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑦">attestation object</a> was generated
+provides no means for a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⓪">Relying Party</a> to verify that an <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑦">attestation object</a> was generated
 by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⓪">authenticator</a> the user intended, and not by a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186①">man-in-the-middle attacker</a>.
-For example, such an attacker could use malicious code injected into <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⓪">Relying Party</a> script.
-The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪①">Relying Party</a> must therefore rely on other means, e.g., TLS and related technologies,
+For example, such an attacker could use malicious code injected into <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪①">Relying Party</a> script.
+The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪②">Relying Party</a> must therefore rely on other means, e.g., TLS and related technologies,
 to protect the <a data-link-type="dfn" href="#attestation-object" id="ref-for-attestation-object①⑧">attestation object</a> from <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186②">man-in-the-middle attacks</a>.</p>
    <p>Under the assumption that a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑤">registration ceremony</a> is completed securely, and that the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤①">authenticator</a> maintains
 confidentiality of the <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②③">credential private key</a>, subsequent <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑦">authentication ceremonies</a> using that <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑦">public key
 credential</a> are resistant to <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186③">man-in-the-middle attacks</a>.</p>
-   <p>The discussion above holds for all <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②④">attestation types</a>. In all cases it is possible for a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186④">man-in-the-middle attacker</a> to replace the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②②">PublicKeyCredential</a></code> object, including the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④①">attestation statement</a> and the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑥">credential public key</a> to be registered, and subsequently tamper with future <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑥">authentication assertions</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope②③">scoped</a> for the
-same <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪②">Relying Party</a> and passing through the same attacker.</p>
-   <p>Such an attack would potentially be detectable; since the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪③">Relying Party</a> has registered the attacker’s <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑦">credential public key</a> rather
-than the user’s, the attacker must tamper with all subsequent <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑧">authentication ceremonies</a> with that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪④">Relying Party</a>: unscathed
+   <p>The discussion above holds for all <a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②④">attestation types</a>. In all cases it is possible for a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186④">man-in-the-middle attacker</a> to replace the <code class="idl"><a data-link-type="idl" href="#publickeycredential" id="ref-for-publickeycredential②⑤">PublicKeyCredential</a></code> object, including the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④①">attestation statement</a> and the <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑥">credential public key</a> to be registered, and subsequently tamper with future <a data-link-type="dfn" href="#authentication-assertion" id="ref-for-authentication-assertion①⑥">authentication assertions</a> <a data-link-type="dfn" href="#scope" id="ref-for-scope②③">scoped</a> for the
+same <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪③">Relying Party</a> and passing through the same attacker.</p>
+   <p>Such an attack would potentially be detectable; since the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪④">Relying Party</a> has registered the attacker’s <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑦">credential public key</a> rather
+than the user’s, the attacker must tamper with all subsequent <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑧">authentication ceremonies</a> with that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑤">Relying Party</a>: unscathed
 ceremonies will fail, potentially revealing the attack.</p>
-   <p><a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②⑤">Attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑨">Self Attestation</a> and <a data-link-type="dfn" href="#none" id="ref-for-none⑧">None</a> can increase the difficulty of such attacks, since <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑤">Relying Parties</a> can possibly display <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤②">authenticator</a> information, e.g., model designation, to the user. An attacker might therefore need to use
-a genuine <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤③">authenticator</a> of the same model as the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤④">authenticator</a>, or the user might notice that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑥">Relying Party</a> reports
+   <p><a data-link-type="dfn" href="#attestation-type" id="ref-for-attestation-type②⑤">Attestation types</a> other than <a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation①⑨">Self Attestation</a> and <a data-link-type="dfn" href="#none" id="ref-for-none⑧">None</a> can increase the difficulty of such attacks, since <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑥">Relying Parties</a> can possibly display <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤②">authenticator</a> information, e.g., model designation, to the user. An attacker might therefore need to use
+a genuine <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤③">authenticator</a> of the same model as the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤④">authenticator</a>, or the user might notice that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑦">Relying Party</a> reports
 a different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑤">authenticator</a> model than the user expects.</p>
    <p class="note" role="note"><span>Note:</span> All variants of <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186⑤">man-in-the-middle attacks</a> described above are more difficult for an attacker to mount
 than a <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-186" id="ref-for-page-186⑥">man-in-the-middle attack</a> against conventional password authentication.</p>
    <h4 class="heading settled" data-level="13.4.5" id="sctn-revoked-attestation-certificates"><span class="secno">13.4.5. </span><span class="content">Revoked Attestation Certificates</span><a class="self-link" href="#sctn-revoked-attestation-certificates"></a></h4>
-   <p>If <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①②">attestation certificate</a> validation fails due to a revoked intermediate attestation CA certificate, and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑦">Relying Party</a>'s policy
-requires rejecting the registration/authentication request in these situations, then it is RECOMMENDED that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑧">Relying Party</a> also
+   <p>If <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①②">attestation certificate</a> validation fails due to a revoked intermediate attestation CA certificate, and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑧">Relying Party</a>'s policy
+requires rejecting the registration/authentication request in these situations, then it is RECOMMENDED that the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑨">Relying Party</a> also
 un-registers (or marks with a trust level equivalent to "<a data-link-type="dfn" href="#self-attestation" id="ref-for-self-attestation②⓪">self attestation</a>") <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑧">public key credentials</a> that were registered
 after the CA compromise date using an <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①③">attestation certificate</a> chaining up to the same intermediate CA. It is thus RECOMMENDED
-that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⓪⑨">Relying Parties</a> remember intermediate attestation CA certificates during <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑨">registration</a> in order to un-register
+that <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⓪">Relying Parties</a> remember intermediate attestation CA certificates during <a data-link-type="dfn" href="#registration" id="ref-for-registration①⑨">registration</a> in order to un-register
 related <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑤⑨">public key credentials</a> if the <a data-link-type="dfn" href="#registration" id="ref-for-registration②⓪">registration</a> was performed after revocation of such certificates.</p>
    <p>See also the related security consideration for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑥">authenticators</a> in <a href="#sctn-ca-compromise">§ 13.3.2 Attestation Certificate and Attestation Certificate CA Compromise</a>.</p>
    <h4 class="heading settled" data-level="13.4.6" id="sctn-credential-loss-key-mobility"><span class="secno">13.4.6. </span><span class="content">Credential Loss and Key Mobility</span><a class="self-link" href="#sctn-credential-loss-key-mobility"></a></h4>
    <p>This specification defines no protocol for backing up <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②④">credential private keys</a>, or for sharing them between <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑦">authenticators</a>.
 In general, it is expected that a <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②⑤">credential private key</a> never leaves the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑧">authenticator</a> that created it. Losing an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑤⑨">authenticator</a> therefore, in general, means losing all <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⓪">credentials</a> <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑤">bound</a> to the
-lost <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⓪">authenticator</a>, which could lock the user out of an account if the user has only one <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥①">credential</a> registered with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⓪">Relying Party</a>. Instead of backing up or sharing private keys, the Web Authentication API allows registering
+lost <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⓪">authenticator</a>, which could lock the user out of an account if the user has only one <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥①">credential</a> registered with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①①">Relying Party</a>. Instead of backing up or sharing private keys, the Web Authentication API allows registering
 multiple <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥②">credentials</a> for the same user. For example, a user might register <a data-link-type="dfn" href="#platform-credential" id="ref-for-platform-credential②">platform credentials</a> on
 frequently used <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④④">client devices</a>, and one or more <a data-link-type="dfn" href="#roaming-credential" id="ref-for-roaming-credential①">roaming credentials</a> for use as backup and with new or rarely used <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④⑤">client
 devices</a>.</p>
-   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①①">Relying Parties</a> SHOULD allow and encourage users to register multiple <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥③">credentials</a> to the same <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③①">user account</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①②">Relying Parties</a> SHOULD make use of the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials②">excludeCredentials</a></code></code> and <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑦">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id⑨">id</a></code></code> options to ensure that these
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①②">Relying Parties</a> SHOULD allow and encourage users to register multiple <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥③">credentials</a> to the same <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③①">user account</a>. <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①③">Relying Parties</a> SHOULD make use of the <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials②">excludeCredentials</a></code></code> and <code><code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-user" id="ref-for-dom-publickeycredentialcreationoptions-user⑦">user</a></code>.<code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id⑨">id</a></code></code> options to ensure that these
 different <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥④">credentials</a> are <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑥">bound</a> to different <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥①">authenticators</a>.</p>
    <h4 class="heading settled" data-level="13.4.7" id="sctn-unprotected-account-detection"><span class="secno">13.4.7. </span><span class="content">Unprotected account detection</span><a class="self-link" href="#sctn-unprotected-account-detection"></a></h4>
    <p><em>This section is not normative.</em></p>
-   <p>This security consideration applies to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①③">Relying Parties</a> that support <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑨">authentication ceremonies</a> with a non-<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty③">empty</a> <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⓪">allowCredentials</a></code> argument as the first authentication step.
+   <p>This security consideration applies to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①④">Relying Parties</a> that support <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony②⑨">authentication ceremonies</a> with a non-<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty③">empty</a> <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⓪">allowCredentials</a></code> argument as the first authentication step.
 For example, if using authentication with <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①⑤">server-side credentials</a> as the first authentication step.</p>
    <p>In this case the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②①">allowCredentials</a></code> argument risks leaking information
 about which <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③②">user accounts</a> have WebAuthn credentials registered and which do not,
 which may be a signal of account protection strength.
 For example, say an attacker can initiate an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⓪">authentication ceremony</a> by providing only a username,
-and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①④">Relying Party</a> responds with a non-empty <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②②">allowCredentials</a></code> for some <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③③">user accounts</a>,
+and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑤">Relying Party</a> responds with a non-empty <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②②">allowCredentials</a></code> for some <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③③">user accounts</a>,
 and with failure or a password challenge for other <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③④">user accounts</a>.
 The attacker can then conclude that the latter <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑤">user accounts</a> likely do not require a WebAuthn <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑥">assertion</a> for successful authentication,
 and thus focus an attack on those likely weaker accounts.</p>
@@ -6975,7 +7097,7 @@ <h2 class="heading settled" data-level="14" id="sctn-privacy-considerations"><sp
    <p>The privacy principles in <a data-link-type="biblio" href="#biblio-fido-privacy-principles">[FIDO-Privacy-Principles]</a> also apply to this specification.</p>
    <p>This section is divided by audience;
 general privacy considerations are direct subsections of this section,
-while privacy considerations specifically for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥②">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑧⑨">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑤">Relying Party</a> implementers
+while privacy considerations specifically for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥②">authenticator</a>, <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑥">client</a> and <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑥">Relying Party</a> implementers
 are grouped into respective subsections.</p>
    <h3 class="heading settled" data-level="14.1" id="sctn-privacy-attacks"><span class="secno">14.1. </span><span class="content">De-anonymization Prevention Measures</span><a class="self-link" href="#sctn-privacy-attacks"></a></h3>
    <p><em>This section is not normative.</em></p>
@@ -6986,56 +7108,56 @@ <h3 class="heading settled" data-level="14.1" id="sctn-privacy-attacks"><span cl
    <ul>
     <li data-md>
      <p>The user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id③⑨">credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑧">credential public keys</a>.</p>
-     <p>These are registered by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑤">WebAuthn Relying Party</a> and subsequently used by the user to prove possession of the corresponding <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②⑥">credential
-private key</a>. They are also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⓪">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥③">authenticator</a>.</p>
+     <p>These are registered by the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑦">WebAuthn Relying Party</a> and subsequently used by the user to prove possession of the corresponding <a data-link-type="dfn" href="#credential-private-key" id="ref-for-credential-private-key②⑥">credential
+private key</a>. They are also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑦">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥③">authenticator</a>.</p>
     <li data-md>
-     <p>The user’s identities specific to each <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑥">Relying Party</a>, e.g., usernames and <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⓪">user handles</a>.</p>
-     <p>These identities are obviously used by each <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑦">Relying Party</a> to identify a user in their system. They are also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨①">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥④">authenticator</a>.</p>
+     <p>The user’s identities specific to each <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑦">Relying Party</a>, e.g., usernames and <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⓪">user handles</a>.</p>
+     <p>These identities are obviously used by each <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑧">Relying Party</a> to identify a user in their system. They are also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑧">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥④">authenticator</a>.</p>
     <li data-md>
      <p>The user’s biometric characteristic(s), e.g., fingerprints or facial recognition data <a data-link-type="biblio" href="#biblio-isobiometricvocabulary">[ISOBiometricVocabulary]</a>.</p>
-     <p>This is optionally used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑤">authenticator</a> to perform <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑦">user verification</a>. It is not revealed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑧">Relying Party</a>, but in
-the case of <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③⓪">platform authenticators</a>, it might be visible to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨②">client</a> depending on the implementation.</p>
+     <p>This is optionally used by the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑤">authenticator</a> to perform <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑦">user verification</a>. It is not revealed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑨">Relying Party</a>, but in
+the case of <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③⓪">platform authenticators</a>, it might be visible to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑨">client</a> depending on the implementation.</p>
     <li data-md>
      <p>The models of the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑥">authenticators</a>, e.g., product names.</p>
-     <p>This is exposed in the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④②">attestation statement</a> provided to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③①⑨">Relying Party</a> during <a data-link-type="dfn" href="#registration" id="ref-for-registration②①">registration</a>. It is also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨③">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑦">authenticator</a>.</p>
+     <p>This is exposed in the <a data-link-type="dfn" href="#attestation-statement" id="ref-for-attestation-statement④②">attestation statement</a> provided to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⓪">Relying Party</a> during <a data-link-type="dfn" href="#registration" id="ref-for-registration②①">registration</a>. It is also visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⓪">client</a> in the communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑦">authenticator</a>.</p>
     <li data-md>
      <p>The identities of the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑧">authenticators</a>, e.g., serial numbers.</p>
-     <p>This is possibly used by the <a data-link-type="dfn" href="#client" id="ref-for-client⑨④">client</a> to enable communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑨">authenticator</a>, but is not exposed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⓪">Relying Party</a>.</p>
+     <p>This is possibly used by the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪①">client</a> to enable communication with the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑥⑨">authenticator</a>, but is not exposed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②①">Relying Party</a>.</p>
    </ul>
-   <p>Some of the above information is necessarily shared with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②①">Relying Party</a>. The following sections describe the measures taken to
-prevent malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②②">Relying Parties</a> from using it to discover a user’s personal identity.</p>
+   <p>Some of the above information is necessarily shared with the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②②">Relying Party</a>. The following sections describe the measures taken to
+prevent malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②③">Relying Parties</a> from using it to discover a user’s personal identity.</p>
    <h3 class="heading settled" data-level="14.2" id="sctn-non-correlatable-credentials"><span class="secno">14.2. </span><span class="content">Anonymous, Scoped, Non-correlatable <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑤">Public Key Credentials</a></span><a class="self-link" href="#sctn-non-correlatable-credentials"></a></h3>
    <p><em>This section is not normative.</em></p>
-   <p>Although <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⓪">Credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑨">credential public keys</a> are necessarily shared with the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑥">WebAuthn Relying Party</a> to enable strong
-authentication, they are designed to be minimally identifying and not shared between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②③">Relying Parties</a>.</p>
+   <p>Although <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⓪">Credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key③⑨">credential public keys</a> are necessarily shared with the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑧">WebAuthn Relying Party</a> to enable strong
+authentication, they are designed to be minimally identifying and not shared between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②④">Relying Parties</a>.</p>
    <ul>
     <li data-md>
      <p><a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④①">Credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key④⓪">credential public keys</a> are meaningless in isolation, as they only identify <a data-link-type="dfn" href="#credential-key-pair" id="ref-for-credential-key-pair⑤">credential key pairs</a> and not users directly.</p>
     <li data-md>
-     <p>Each <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑥">public key credential</a> is strictly <a data-link-type="dfn" href="#scope" id="ref-for-scope②④">scoped</a> to a specific <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②④">Relying Party</a>, and the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑤">client</a> ensures that its existence is not
-revealed to other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑤">Relying Parties</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑥">Relying Party</a> thus cannot ask the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑥">client</a> to reveal a user’s other identities.</p>
+     <p>Each <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑥">public key credential</a> is strictly <a data-link-type="dfn" href="#scope" id="ref-for-scope②④">scoped</a> to a specific <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑤">Relying Party</a>, and the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪②">client</a> ensures that its existence is not
+revealed to other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑥">Relying Parties</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑦">Relying Party</a> thus cannot ask the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪③">client</a> to reveal a user’s other identities.</p>
     <li data-md>
-     <p>The <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑦">client</a> also ensures that the existence of a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑦">public key credential</a> is not revealed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑦">Relying Party</a> without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑥">user
-consent</a>. This is detailed further in <a href="#sctn-make-credential-privacy">§ 14.5.1 Registration Ceremony Privacy</a> and <a href="#sctn-assertion-privacy">§ 14.5.2 Authentication Ceremony Privacy</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑧">Relying Party</a> thus cannot silently identify a user, even if the user has a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑧">public key credential</a> registered and available.</p>
+     <p>The <a data-link-type="dfn" href="#client" id="ref-for-client①⓪④">client</a> also ensures that the existence of a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑦">public key credential</a> is not revealed to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑧">Relying Party</a> without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑥">user
+consent</a>. This is detailed further in <a href="#sctn-make-credential-privacy">§ 14.5.1 Registration Ceremony Privacy</a> and <a href="#sctn-assertion-privacy">§ 14.5.2 Authentication Ceremony Privacy</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑨">Relying Party</a> thus cannot silently identify a user, even if the user has a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑧">public key credential</a> registered and available.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⓪">Authenticators</a> ensure that the <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④②">credential IDs</a> and <a data-link-type="dfn" href="#credential-public-key" id="ref-for-credential-public-key④①">credential public keys</a> of different <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑥⑨">public key credentials</a> are
-not correlatable as belonging to the same user. A pair of malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③②⑨">Relying Parties</a> thus cannot correlate users between their
+not correlatable as belonging to the same user. A pair of malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⓪">Relying Parties</a> thus cannot correlate users between their
 systems without additional information, e.g., a willfully reused username or e-mail address.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦①">Authenticators</a> ensure that their <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①④">attestation certificates</a> are not unique enough to identify a single <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦②">authenticator</a> or a small group of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦③">authenticators</a>. This is detailed further in <a href="#sctn-attestation-privacy">§ 14.4.1 Attestation Privacy</a>. A pair of malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⓪">Relying Parties</a> thus cannot correlate users between their systems by tracking individual <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦④">authenticators</a>.</p>
+     <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦①">Authenticators</a> ensure that their <a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①④">attestation certificates</a> are not unique enough to identify a single <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦②">authenticator</a> or a small group of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦③">authenticators</a>. This is detailed further in <a href="#sctn-attestation-privacy">§ 14.4.1 Attestation Privacy</a>. A pair of malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③①">Relying Parties</a> thus cannot correlate users between their systems by tracking individual <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦④">authenticators</a>.</p>
    </ul>
    <p>Additionally, a <a data-link-type="dfn" href="#client-side-discoverable-public-key-credential-source" id="ref-for-client-side-discoverable-public-key-credential-source⑧">client-side discoverable public key credential source</a> can optionally include a <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②①">user
-handle</a> specified by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③①">Relying Party</a>. The <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⓪">credential</a> can then be used to both identify and <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑤">authenticate</a> the user.
-This means that a privacy-conscious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③②">Relying Party</a> can allow creation of a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑥">user account</a> without a traditional username,
-further improving non-correlatability between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③③">Relying Parties</a>.</p>
+handle</a> specified by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③②">Relying Party</a>. The <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⓪">credential</a> can then be used to both identify and <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑤">authenticate</a> the user.
+This means that a privacy-conscious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③③">Relying Party</a> can allow creation of a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑥">user account</a> without a traditional username,
+further improving non-correlatability between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③④">Relying Parties</a>.</p>
    <h3 class="heading settled" data-level="14.3" id="sctn-biometric-privacy"><span class="secno">14.3. </span><span class="content">Authenticator-local <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition④">Biometric Recognition</a></span><a class="self-link" href="#sctn-biometric-privacy"></a></h3>
    <p><a data-link-type="dfn" href="#biometric-authenticator" id="ref-for-biometric-authenticator①">Biometric authenticators</a> perform the <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition⑤">biometric recognition</a> internally in the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑤">authenticator</a> - though for <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③①">platform
-authenticators</a> the biometric data might also be visible to the <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑧">client</a>, depending on the implementation. Biometric data is
-not revealed to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑦">WebAuthn Relying Party</a>; it is used only locally to perform <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑧">user verification</a> authorizing the creation and <a data-link-type="dfn" href="#registration" id="ref-for-registration②②">registration</a> of, or <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑥">authentication</a> using, a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦①">public key credential</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③④">Relying Party</a> therefore cannot discover the
-user’s personal identity via biometric data, and a security breach at a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑤">Relying Party</a> cannot expose biometric data for an attacker to
-use for forging logins at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑥">Relying Parties</a>.</p>
-   <p>In the case where a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑦">Relying Party</a> requires <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition⑥">biometric recognition</a>, this is performed locally by the <a data-link-type="dfn" href="#biometric-authenticator" id="ref-for-biometric-authenticator②">biometric authenticator</a> perfoming <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑨">user verification</a> and then signaling the result by setting the <a data-link-type="dfn" href="#uv" id="ref-for-uv⑥">UV</a> <a data-link-type="dfn" href="#flags" id="ref-for-flags③④">flag</a> in the signed <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑦">assertion</a> response,
-instead of revealing the biometric data itself to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑧">Relying Party</a>.</p>
+authenticators</a> the biometric data might also be visible to the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑤">client</a>, depending on the implementation. Biometric data is
+not revealed to the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑨">WebAuthn Relying Party</a>; it is used only locally to perform <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑧">user verification</a> authorizing the creation and <a data-link-type="dfn" href="#registration" id="ref-for-registration②②">registration</a> of, or <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑥">authentication</a> using, a <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦①">public key credential</a>. A malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑤">Relying Party</a> therefore cannot discover the
+user’s personal identity via biometric data, and a security breach at a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑥">Relying Party</a> cannot expose biometric data for an attacker to
+use for forging logins at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑦">Relying Parties</a>.</p>
+   <p>In the case where a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑧">Relying Party</a> requires <a data-link-type="dfn" href="#biometric-recognition" id="ref-for-biometric-recognition⑥">biometric recognition</a>, this is performed locally by the <a data-link-type="dfn" href="#biometric-authenticator" id="ref-for-biometric-authenticator②">biometric authenticator</a> perfoming <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification④⑨">user verification</a> and then signaling the result by setting the <a data-link-type="dfn" href="#uv" id="ref-for-uv⑥">UV</a> <a data-link-type="dfn" href="#flags" id="ref-for-flags③④">flag</a> in the signed <a data-link-type="dfn" href="#assertion" id="ref-for-assertion⑦">assertion</a> response,
+instead of revealing the biometric data itself to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑨">Relying Party</a>.</p>
    <h3 class="heading settled" data-level="14.4" id="sctn-privacy-considerations-authenticator"><span class="secno">14.4. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑦⑥">authenticators</a></span><a class="self-link" href="#sctn-privacy-considerations-authenticator"></a></h3>
    <h4 class="heading settled" data-level="14.4.1" id="sctn-attestation-privacy"><span class="secno">14.4.1. </span><span class="content">Attestation Privacy</span><a class="self-link" href="#sctn-attestation-privacy"></a></h4>
    <p><a data-link-type="dfn" href="#attestation-certificate" id="ref-for-attestation-certificate①⑤">Attestation certificates</a> and <a data-link-type="dfn" href="#attestation-key-pair" id="ref-for-attestation-key-pair⑦">attestation key pairs</a> can be used to track users
@@ -7062,79 +7184,79 @@ <h4 class="heading settled" data-level="14.4.1" id="sctn-attestation-privacy"><s
     confusion in the specific context of this specification.</p>
    </ul>
    <h4 class="heading settled" data-level="14.4.2" id="sctn-pii-privacy"><span class="secno">14.4.2. </span><span class="content">Privacy of personally identifying information Stored in Authenticators</span><a class="self-link" href="#sctn-pii-privacy"></a></h4>
-   <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧②">Authenticators</a> MAY provide additional information to <a data-link-type="dfn" href="#client" id="ref-for-client⑨⑨">clients</a> outside what’s defined by this specification, e.g.,
-to enable the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⓪">client</a> to provide a rich UI with which the user can pick which <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②①">credential</a> to use for an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③①">authentication
+   <p><a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧②">Authenticators</a> MAY provide additional information to <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑥">clients</a> outside what’s defined by this specification, e.g.,
+to enable the <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑦">client</a> to provide a rich UI with which the user can pick which <a data-link-type="dfn" href="https://w3c.github.io/webappsec-credential-management/#concept-credential" id="ref-for-concept-credential②①">credential</a> to use for an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③①">authentication
 ceremony</a>. If an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧③">authenticator</a> chooses to do so, it SHOULD NOT expose personally identifying information unless successful <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤⓪">user verification</a> has been
 performed. If the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧④">authenticator</a> supports <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤①">user verification</a> with more than one concurrently enrolled user, the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑤">authenticator</a> SHOULD NOT expose personally identifying information of users other than the currently <a data-link-type="dfn" href="#concept-user-verified" id="ref-for-concept-user-verified⑥">verified</a> user. Consequently, an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑥">authenticator</a> that is not capable of <a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤②">user verification</a> SHOULD NOT store personally identifying information.</p>
    <p>For the purposes of this discussion, the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②②">user handle</a> conveyed as the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialuserentity-id" id="ref-for-dom-publickeycredentialuserentity-id①⓪">id</a></code> member of <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialuserentity" id="ref-for-dictdef-publickeycredentialuserentity⑦">PublicKeyCredentialUserEntity</a></code> is not considered personally identifying information; see <a href="#sctn-user-handle-privacy">§ 14.6.1 User Handle Contents</a>.</p>
    <p>These recommendations serve to prevent an adversary with physical access to an <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑦">authenticator</a> from extracting personally identifying information about the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑧">authenticator</a>'s enrolled user(s).</p>
-   <h3 class="heading settled" data-level="14.5" id="sctn-privacy-considerations-client"><span class="secno">14.5. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#client" id="ref-for-client①⓪①">clients</a></span><a class="self-link" href="#sctn-privacy-considerations-client"></a></h3>
+   <h3 class="heading settled" data-level="14.5" id="sctn-privacy-considerations-client"><span class="secno">14.5. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#client" id="ref-for-client①⓪⑧">clients</a></span><a class="self-link" href="#sctn-privacy-considerations-client"></a></h3>
    <h4 class="heading settled" data-level="14.5.1" id="sctn-make-credential-privacy"><span class="secno">14.5.1. </span><span class="content">Registration Ceremony Privacy</span><a class="self-link" href="#sctn-make-credential-privacy"></a></h4>
    <p>In order to protect users from being identified without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑦">consent</a>, implementations of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-create-slot" id="ref-for-dom-publickeycredential-create-slot①①">[[Create]](origin, options, sameOriginWithAncestors)</a></code> method need to take care to not leak information that
-could enable a malicious <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑧">WebAuthn Relying Party</a> to distinguish between these cases, where "excluded" means that at least one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦②">credentials</a> listed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③③⑨">Relying Party</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials③">excludeCredentials</a></code> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑦">bound</a> to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑨">authenticator</a>:</p>
+could enable a malicious <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⓪">WebAuthn Relying Party</a> to distinguish between these cases, where "excluded" means that at least one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦②">credentials</a> listed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⓪">Relying Party</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials③">excludeCredentials</a></code> is <a data-link-type="dfn" href="#bound-credential" id="ref-for-bound-credential①⑦">bound</a> to the <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑧⑨">authenticator</a>:</p>
    <ul>
     <li data-md>
      <p>No <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⓪">authenticators</a> are present.</p>
     <li data-md>
      <p>At least one <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨①">authenticator</a> is present, and at least one present <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨②">authenticator</a> is excluded.</p>
    </ul>
-   <p>If the above cases are distinguishable, information is leaked by which a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⓪">Relying Party</a> could identify the user by probing for
+   <p>If the above cases are distinguishable, information is leaked by which a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④①">Relying Party</a> could identify the user by probing for
 which <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦③">credentials</a> are available. For example, one such information leak is if the client returns a
-failure response as soon as an excluded <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨③">authenticator</a> becomes available. In this case - especially if the excluded <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨④">authenticator</a> is a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③②">platform authenticator</a> - the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④①">Relying Party</a> could detect that the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①②">ceremony</a> was canceled before the
+failure response as soon as an excluded <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨③">authenticator</a> becomes available. In this case - especially if the excluded <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨④">authenticator</a> is a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③②">platform authenticator</a> - the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④②">Relying Party</a> could detect that the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①②">ceremony</a> was canceled before the
 timeout and before the user could feasibly have canceled it manually, and thus conclude that at least one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦④">credentials</a> listed in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-excludecredentials" id="ref-for-dom-publickeycredentialcreationoptions-excludecredentials④">excludeCredentials</a></code> parameter is available to the user.</p>
    <p>The above is not a concern, however, if the user has <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑧">consented</a> to create a new credential before a
 distinguishable error is returned, because in this case the user has confirmed intent to share the information that would be
 leaked.</p>
    <h4 class="heading settled" data-level="14.5.2" id="sctn-assertion-privacy"><span class="secno">14.5.2. </span><span class="content">Authentication Ceremony Privacy</span><a class="self-link" href="#sctn-assertion-privacy"></a></h4>
    <p>In order to protect users from being identified without <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent②⑨">consent</a>, implementations of the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredential-discoverfromexternalsource-slot" id="ref-for-dom-publickeycredential-discoverfromexternalsource-slot①②">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a></code> method need to take care to not
-leak information that could enable a malicious <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party④⑨">WebAuthn Relying Party</a> to distinguish between these cases, where "named" means that the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑤">credential</a> is listed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④②">Relying Party</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②③">allowCredentials</a></code>:</p>
+leak information that could enable a malicious <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤①">WebAuthn Relying Party</a> to distinguish between these cases, where "named" means that the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑤">credential</a> is listed by the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④③">Relying Party</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②③">allowCredentials</a></code>:</p>
    <ul>
     <li data-md>
      <p>A named <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑥">credential</a> is not available.</p>
     <li data-md>
      <p>A named <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑦">credential</a> is available, but the user does not <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent③⓪">consent</a> to use it.</p>
    </ul>
-   <p>If the above cases are distinguishable, information is leaked by which a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④③">Relying Party</a> could identify the user by probing
+   <p>If the above cases are distinguishable, information is leaked by which a malicious <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④④">Relying Party</a> could identify the user by probing
 for which <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑧">credentials</a> are available. For example, one such information leak is if the client returns a
 failure response as soon as the user denies <a data-link-type="dfn" href="#user-consent" id="ref-for-user-consent③①">consent</a> to proceed with an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③②">authentication ceremony</a>. In this
-case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④④">Relying Party</a> could detect that the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①③">ceremony</a> was canceled by the user and not the timeout, and thus conclude that at least
+case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑤">Relying Party</a> could detect that the <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①③">ceremony</a> was canceled by the user and not the timeout, and thus conclude that at least
 one of the <a data-link-type="dfn" href="#public-key-credential" id="ref-for-public-key-credential⑦⑨">credentials</a> listed in the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②④">allowCredentials</a></code> parameter is
 available to the user.</p>
    <h4 class="heading settled" data-level="14.5.3" id="sctn-os-account-privacy"><span class="secno">14.5.3. </span><span class="content">Privacy Between Operating System Accounts</span><a class="self-link" href="#sctn-os-account-privacy"></a></h4>
    <p>If a <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③③">platform authenticator</a> is included in a <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④⑥">client device</a> with a multi-user operating system, the <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③④">platform
 authenticator</a> and <a data-link-type="dfn" href="#client-device" id="ref-for-client-device④⑦">client device</a> SHOULD work together to ensure that the existence of any <a data-link-type="dfn" href="#platform-credential" id="ref-for-platform-credential③">platform credential</a> is revealed
 only to the operating system user that created that <a data-link-type="dfn" href="#platform-credential" id="ref-for-platform-credential④">platform credential</a>.</p>
-   <h3 class="heading settled" data-level="14.6" id="sctn-privacy-considerations-rp"><span class="secno">14.6. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑤">Relying Parties</a></span><a class="self-link" href="#sctn-privacy-considerations-rp"></a></h3>
+   <h3 class="heading settled" data-level="14.6" id="sctn-privacy-considerations-rp"><span class="secno">14.6. </span><span class="content">Privacy considerations for <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑥">Relying Parties</a></span><a class="self-link" href="#sctn-privacy-considerations-rp"></a></h3>
    <h4 class="heading settled" data-level="14.6.1" id="sctn-user-handle-privacy"><span class="secno">14.6.1. </span><span class="content">User Handle Contents</span><a class="self-link" href="#sctn-user-handle-privacy"></a></h4>
-   <p>Since the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②③">user handle</a> is not considered personally identifying information in <a href="#sctn-pii-privacy">§ 14.4.2 Privacy of personally identifying information Stored in Authenticators</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑥">Relying Party</a> MUST NOT include personally identifying information, e.g., e-mail
+   <p>Since the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②③">user handle</a> is not considered personally identifying information in <a href="#sctn-pii-privacy">§ 14.4.2 Privacy of personally identifying information Stored in Authenticators</a>, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑦">Relying Party</a> MUST NOT include personally identifying information, e.g., e-mail
 addresses or usernames, in the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②④">user handle</a>. This includes hash values of personally identifying information, unless the hash
-function is <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258">salted</a> with <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258①">salt</a> values private to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑦">Relying Party</a>, since hashing does not prevent probing for guessable input
+function is <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258">salted</a> with <a data-link-type="dfn" href="https://tools.ietf.org/html/rfc4949#page-258" id="ref-for-page-258①">salt</a> values private to the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑧">Relying Party</a>, since hashing does not prevent probing for guessable input
 values. It is RECOMMENDED to let the <a data-link-type="dfn" href="#user-handle" id="ref-for-user-handle②⑤">user handle</a> be 64 random bytes, and store this value in the <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑦">user account</a>.</p>
    <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><span class="secno">14.6.2. </span><span class="content">Username Enumeration</span><a class="self-link" href="#sctn-username-enumeration"></a></h4>
-   <p>While initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑥">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③③">authentication ceremony</a>, there is a risk that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤⓪">WebAuthn Relying Party</a> might leak sensitive
-information about its registered users. For example, if a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑧">Relying Party</a> uses e-mail addresses as usernames and an attacker attempts to
-initiate an <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑦">authentication</a> <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①④">ceremony</a> for "alex.mueller@example.com" and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑨">Relying Party</a> responds with a failure, but then
+   <p>While initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑥">registration</a> or <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③③">authentication ceremony</a>, there is a risk that the <a data-link-type="dfn" href="#webauthn-relying-party" id="ref-for-webauthn-relying-party⑤②">WebAuthn Relying Party</a> might leak sensitive
+information about its registered users. For example, if a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③④⑨">Relying Party</a> uses e-mail addresses as usernames and an attacker attempts to
+initiate an <a data-link-type="dfn" href="#authentication" id="ref-for-authentication①⑦">authentication</a> <a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①④">ceremony</a> for "alex.mueller@example.com" and the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⓪">Relying Party</a> responds with a failure, but then
 successfully initiates an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③④">authentication ceremony</a> for "j.doe@example.com", then the attacker can conclude that "j.doe@example.com"
-is registered and "alex.mueller@example.com" is not. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⓪">Relying Party</a> has thus leaked the possibly sensitive information that
-"j.doe@example.com" has a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑧">user account</a> at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤①">Relying Party</a>.</p>
-   <p>The following is a non-normative, non-exhaustive list of measures the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤②">Relying Party</a> may implement to mitigate or prevent information
+is registered and "alex.mueller@example.com" is not. The <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤①">Relying Party</a> has thus leaked the possibly sensitive information that
+"j.doe@example.com" has a <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑧">user account</a> at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤②">Relying Party</a>.</p>
+   <p>The following is a non-normative, non-exhaustive list of measures the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤③">Relying Party</a> may implement to mitigate or prevent information
 leakage due to such an attack:</p>
    <ul>
     <li data-md>
      <p>For <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑦">registration ceremonies</a>:</p>
      <ul>
       <li data-md>
-       <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤③">Relying Party</a> uses <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤④">Relying Party</a>-specific usernames to identify users:</p>
+       <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤④">Relying Party</a> uses <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑤">Relying Party</a>-specific usernames to identify users:</p>
        <ul>
         <li data-md>
          <p>When initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑧">registration ceremony</a>, disallow registration of usernames that are syntactically valid e-mail
 addresses.</p>
-         <p class="note" role="note"><span>Note:</span> The motivation for this suggestion is that in this case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑤">Relying Party</a> probably has no choice but to fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑨">registration ceremony</a> if the user attempts to register a username that is already registered, and an information
+         <p class="note" role="note"><span>Note:</span> The motivation for this suggestion is that in this case the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑥">Relying Party</a> probably has no choice but to fail the <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony①⑨">registration ceremony</a> if the user attempts to register a username that is already registered, and an information
 leak might therefore be unavoidable. By disallowing e-mail addresses as usernames, the impact of the leakage can be
-mitigated since it will be less likely that a user has the same username at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑥">Relying Party</a> as at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑦">Relying Parties</a>.</p>
+mitigated since it will be less likely that a user has the same username at this <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑦">Relying Party</a> as at other <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑧">Relying Parties</a>.</p>
        </ul>
       <li data-md>
-       <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑧">Relying Party</a> uses e-mail addresses to identify users:</p>
+       <p>If the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑨">Relying Party</a> uses e-mail addresses to identify users:</p>
        <ul>
         <li data-md>
          <p>When initiating a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②⓪">registration ceremony</a>, interrupt the user interaction after the e-mail address is supplied and
@@ -7151,10 +7273,10 @@ <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><
      <ul>
       <li data-md>
        <p>If, when initiating an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑥">authentication ceremony</a>, there is no <a data-link-type="dfn" href="#user-account" id="ref-for-user-account③⑨">user account</a> matching the provided username, continue the
-ceremony by invoking <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑦">navigator.credentials.get()</a></code> using a syntactically valid <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions⑧">PublicKeyCredentialRequestOptions</a></code> object that is populated with plausible imaginary values.</p>
+ceremony by invoking <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get③⑧">navigator.credentials.get()</a></code> using a syntactically valid <code class="idl"><a data-link-type="idl" href="#dictdef-publickeycredentialrequestoptions" id="ref-for-dictdef-publickeycredentialrequestoptions①②">PublicKeyCredentialRequestOptions</a></code> object that is populated with plausible imaginary values.</p>
        <p>This approach could also be used to mitigate information leakage via <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑤">allowCredentials</a></code>;
 see <a href="#sctn-unprotected-account-detection">§ 13.4.7 Unprotected account detection</a> and <a href="#sctn-credential-id-privacy-leak">§ 14.6.3 Privacy leak via credential IDs</a>.</p>
-       <p class="note" role="note"><span>Note:</span> The username may be "provided" in various <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑤⑨">Relying Party</a>-specific fashions: login form, session cookie, etc.</p>
+       <p class="note" role="note"><span>Note:</span> The username may be "provided" in various <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⓪">Relying Party</a>-specific fashions: login form, session cookie, etc.</p>
        <p class="note" role="note"><span>Note:</span> If returned imaginary values noticeably differ from actual ones, clever attackers may be able to discern them and
     thus be able to test for existence of actual accounts. Examples of noticeably different values include if the values
     are always the same for all username inputs, or are different in repeated attempts with the same username input. The <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑥">allowCredentials</a></code> member could therefore be populated with pseudo-random values
@@ -7171,17 +7293,17 @@ <h4 class="heading settled" data-level="14.6.2" id="sctn-username-enumeration"><
    </ul>
    <h4 class="heading settled" data-level="14.6.3" id="sctn-credential-id-privacy-leak"><span class="secno">14.6.3. </span><span class="content">Privacy leak via credential IDs</span><a class="self-link" href="#sctn-credential-id-privacy-leak"></a></h4>
    <p><em>This section is not normative.</em></p>
-   <p>This privacy consideration applies to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⓪">Relying Parties</a> that support <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑧">authentication ceremonies</a> with a non-<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty④">empty</a> <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑦">allowCredentials</a></code> argument as the first authentication step.
+   <p>This privacy consideration applies to <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥①">Relying Parties</a> that support <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony③⑧">authentication ceremonies</a> with a non-<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty④">empty</a> <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑦">allowCredentials</a></code> argument as the first authentication step.
 For example, if using authentication with <a data-link-type="dfn" href="#server-side-credential" id="ref-for-server-side-credential①⑥">server-side credentials</a> as the first authentication step.</p>
    <p>In this case the <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑧">allowCredentials</a></code> argument risks leaking personally identifying information,
-since it exposes the user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④③">credential IDs</a> to an unauthenticated caller. <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④④">Credential IDs</a> are designed to not be correlatable between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥①">Relying Parties</a>,
+since it exposes the user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④③">credential IDs</a> to an unauthenticated caller. <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④④">Credential IDs</a> are designed to not be correlatable between <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥②">Relying Parties</a>,
 but the length of a <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑤">credential ID</a> might be a hint as to what type of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑥">authenticator</a> created it.
-It is likely that a user will use the same username and set of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑦">authenticators</a> for several <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥②">Relying Parties</a>,
+It is likely that a user will use the same username and set of <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑦">authenticators</a> for several <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥③">Relying Parties</a>,
 so the number of <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑥">credential IDs</a> in <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials②⑨">allowCredentials</a></code> and their lengths
 might serve as a global correlation handle to de-anonymize the user.
 Knowing a user’s <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑦">credential IDs</a> also makes it possible to confirm guesses about the user’s identity
 given only momentary physical access to one of the user’s <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑧">authenticators</a>.</p>
-   <p>In order to prevent such information leakage, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥③">Relying Party</a> could for example:</p>
+   <p>In order to prevent such information leakage, the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥④">Relying Party</a> could for example:</p>
    <ul>
     <li data-md>
      <p>Perform a separate authentication step,
@@ -7193,11 +7315,11 @@ <h4 class="heading settled" data-level="14.6.3" id="sctn-credential-id-privacy-l
    </ul>
    <p>If the above prevention measures are not available,
 i.e., if <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-allowcredentials" id="ref-for-dom-publickeycredentialrequestoptions-allowcredentials③①">allowCredentials</a></code> needs to be exposed given only a username,
-the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥④">Relying Party</a> could mitigate the privacy leak using the same approach of returning imaginary <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑨">credential IDs</a> as discussed in <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a>.</p>
+the <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑤">Relying Party</a> could mitigate the privacy leak using the same approach of returning imaginary <a data-link-type="dfn" href="#credential-id" id="ref-for-credential-id④⑨">credential IDs</a> as discussed in <a href="#sctn-username-enumeration">§ 14.6.2 Username Enumeration</a>.</p>
    <h2 class="heading settled" data-level="15" id="sctn-accessiblility-considerations"><span class="secno">15. </span><span class="content">Accessibility Considerations</span><a class="self-link" href="#sctn-accessiblility-considerations"></a></h2>
    <p><a data-link-type="dfn" href="#user-verification" id="ref-for-user-verification⑤③">User verification</a>-capable <a data-link-type="dfn" href="#authenticator" id="ref-for-authenticator②⑨⑨">authenticators</a>, whether <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑦">roaming</a> or <a data-link-type="dfn" href="#platform-authenticators" id="ref-for-platform-authenticators③⑤">platform</a>, should offer users more than one user verification method.  For example, both fingerprint sensing and PIN entry. This allows for fallback to other user verification means if the selected one is not working for some reason. Note that in the case of <a data-link-type="dfn" href="#roaming-authenticators" id="ref-for-roaming-authenticators②⑧">roaming authenticators</a>, the authenticator and platform might work together to provide a user verification method such as PIN entry <a data-link-type="biblio" href="#biblio-fido-ctap">[FIDO-CTAP]</a>.</p>
-   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑤">Relying Parties</a>, at <a data-link-type="dfn" href="#registration" id="ref-for-registration②③">registration</a> time, SHOULD provide affordances for users to complete future <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture③⓪">authorization gestures</a> correctly. This could involve naming the authenticator, choosing a picture to associate with the device, or entering freeform text instructions (e.g., as a reminder-to-self).</p>
-   <p><a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑥">Ceremonies</a> relying on timing, e.g., a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②①">registration ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout④">timeout</a></code>) or an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⓪">authentication ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout④">timeout</a></code>), ought to follow <a data-link-type="biblio" href="#biblio-wcag21">[WCAG21]</a>'s <a href="https://www.w3.org/TR/WCAG21/#enough-time">Guideline 2.2 Enough Time</a>. If a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤②">client platform</a> determines that a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑥">Relying Party</a>-supplied timeout does not appropriately adhere to the latter <a data-link-type="biblio" href="#biblio-wcag21">[WCAG21]</a> guidelines, then the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤③">client platform</a> MAY adjust the timeout accordingly.</p>
+   <p><a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑥">Relying Parties</a>, at <a data-link-type="dfn" href="#registration" id="ref-for-registration②③">registration</a> time, SHOULD provide affordances for users to complete future <a data-link-type="dfn" href="#authorization-gesture" id="ref-for-authorization-gesture③⓪">authorization gestures</a> correctly. This could involve naming the authenticator, choosing a picture to associate with the device, or entering freeform text instructions (e.g., as a reminder-to-self).</p>
+   <p><a data-link-type="dfn" href="#ceremony" id="ref-for-ceremony①⑥">Ceremonies</a> relying on timing, e.g., a <a data-link-type="dfn" href="#registration-ceremony" id="ref-for-registration-ceremony②①">registration ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialcreationoptions-timeout" id="ref-for-dom-publickeycredentialcreationoptions-timeout④">timeout</a></code>) or an <a data-link-type="dfn" href="#authentication-ceremony" id="ref-for-authentication-ceremony④⓪">authentication ceremony</a> (see <code class="idl"><a data-link-type="idl" href="#dom-publickeycredentialrequestoptions-timeout" id="ref-for-dom-publickeycredentialrequestoptions-timeout④">timeout</a></code>), ought to follow <a data-link-type="biblio" href="#biblio-wcag21">[WCAG21]</a>'s <a href="https://www.w3.org/TR/WCAG21/#enough-time">Guideline 2.2 Enough Time</a>. If a <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤②">client platform</a> determines that a <a data-link-type="dfn" href="#relying-party" id="ref-for-relying-party③⑥⑦">Relying Party</a>-supplied timeout does not appropriately adhere to the latter <a data-link-type="biblio" href="#biblio-wcag21">[WCAG21]</a> guidelines, then the <a data-link-type="dfn" href="#client-platform" id="ref-for-client-platform⑤③">client platform</a> MAY adjust the timeout accordingly.</p>
    <h2 class="heading settled" data-level="16" id="sctn-acknowledgements"><span class="secno">16. </span><span class="content">Acknowledgements</span><a class="self-link" href="#sctn-acknowledgements"></a></h2>
     We thank the following people for their reviews of, and contributions to, this specification:
 Yuriy Ackermann,
@@ -7245,7 +7367,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#add-credential">Add Credential</a><span>, in § 11.5</span>
    <li><a href="#add-virtual-authenticator">Add Virtual Authenticator</a><span>, in § 11.3</span>
    <li><a href="#dom-publickeycredentialparameters-alg">alg</a><span>, in § 5.3</span>
-   <li><a href="#dom-publickeycredentialrequestoptions-allowcredentials">allowCredentials</a><span>, in § 5.5</span>
+   <li>
+    allowCredentials
+    <ul>
+     <li><a href="#dom-publickeycredentialrequestoptions-allowcredentials">dict-member for PublicKeyCredentialRequestOptions</a><span>, in § 5.5</span>
+     <li><a href="#dom-publickeycredentialrequestoptionsjson-allowcredentials">dict-member for PublicKeyCredentialRequestOptionsJSON</a><span>, in § 5.1.9</span>
+    </ul>
    <li><a href="#android-key-attestation-certificate-extension-data">android key attestation certificate extension data</a><span>, in § 8.4.1</span>
    <li><a href="#anonca">AnonCA</a><span>, in § 6.5.3</span>
    <li><a href="#anonymization-ca">Anonymization CA</a><span>, in § 6.5.3</span>
@@ -7266,7 +7393,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#assertion-signature">assertion signature</a><span>, in § 6</span>
    <li><a href="#attca">AttCA</a><span>, in § 6.5.3</span>
    <li><a href="#attestation">Attestation</a><span>, in § 4</span>
-   <li><a href="#dom-publickeycredentialcreationoptions-attestation">attestation</a><span>, in § 5.4</span>
+   <li>
+    attestation
+    <ul>
+     <li><a href="#dom-publickeycredentialcreationoptions-attestation">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-attestation">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#attestation-ca">Attestation CA</a><span>, in § 6.5.3</span>
    <li><a href="#attestation-certificate">Attestation Certificate</a><span>, in § 4</span>
    <li><a href="#attestation-conveyance">Attestation Conveyance</a><span>, in § 5.4.7</span>
@@ -7274,7 +7406,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#credentialcreationdata-attestationconveyancepreferenceoption">attestationConveyancePreferenceOption</a><span>, in § 5.1.3</span>
    <li><a href="#attestation-key-pair">attestation key pair</a><span>, in § 4</span>
    <li><a href="#attestation-object">attestation object</a><span>, in § 6.5</span>
-   <li><a href="#dom-authenticatorattestationresponse-attestationobject">attestationObject</a><span>, in § 5.2.1</span>
+   <li>
+    attestationObject
+    <ul>
+     <li><a href="#dom-authenticatorattestationresponse-attestationobject">attribute for AuthenticatorAttestationResponse</a><span>, in § 5.2.1</span>
+     <li><a href="#dom-authenticatorattestationresponsejson-attestationobject">dict-member for AuthenticatorAttestationResponseJSON</a><span>, in § 5.1</span>
+    </ul>
    <li><a href="#credentialcreationdata-attestationobjectresult">attestationObjectResult</a><span>, in § 5.1.3</span>
    <li><a href="#attestation-private-key">attestation private key</a><span>, in § 4</span>
    <li><a href="#attestation-public-key">attestation public key</a><span>, in § 4</span>
@@ -7292,25 +7429,37 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#authentication-ceremony">Authentication Ceremony</a><span>, in § 4</span>
    <li><a href="#authentication-extension">authentication extension</a><span>, in § 9</span>
    <li><a href="#dictdef-authenticationextensionsclientinputs">AuthenticationExtensionsClientInputs</a><span>, in § 5.7.1</span>
+   <li><a href="#dictdef-authenticationextensionsclientinputsjson">AuthenticationExtensionsClientInputsJSON</a><span>, in § 5.1.8</span>
    <li><a href="#dictdef-authenticationextensionsclientoutputs">AuthenticationExtensionsClientOutputs</a><span>, in § 5.7.2</span>
+   <li><a href="#dictdef-authenticationextensionsclientoutputsjson">AuthenticationExtensionsClientOutputsJSON</a><span>, in § 5.1</span>
    <li><a href="#dictdef-authenticationextensionslargeblobinputs">AuthenticationExtensionsLargeBlobInputs</a><span>, in § 10.5</span>
    <li><a href="#dictdef-authenticationextensionslargebloboutputs">AuthenticationExtensionsLargeBlobOutputs</a><span>, in § 10.5</span>
    <li><a href="#authentication-factor-capability">Authentication Factor Capability</a><span>, in § 6.2.3</span>
+   <li><a href="#dictdef-authenticationresponsejson">AuthenticationResponseJSON</a><span>, in § 5.1</span>
    <li><a href="#authenticator">Authenticator</a><span>, in § 4</span>
    <li><a href="#authenticatorassertionresponse">AuthenticatorAssertionResponse</a><span>, in § 5.2.2</span>
+   <li><a href="#dictdef-authenticatorassertionresponsejson">AuthenticatorAssertionResponseJSON</a><span>, in § 5.1</span>
    <li><a href="#enumdef-authenticatorattachment">AuthenticatorAttachment</a><span>, in § 5.4.5</span>
    <li>
     authenticatorAttachment
     <ul>
      <li><a href="#dom-publickeycredential-authenticatorattachment">attribute for PublicKeyCredential</a><span>, in § 5.1</span>
+     <li><a href="#dom-authenticationresponsejson-authenticatorattachment">dict-member for AuthenticationResponseJSON</a><span>, in § 5.1</span>
      <li><a href="#dom-authenticatorselectioncriteria-authenticatorattachment">dict-member for AuthenticatorSelectionCriteria</a><span>, in § 5.4.4</span>
+     <li><a href="#dom-registrationresponsejson-authenticatorattachment">dict-member for RegistrationResponseJSON</a><span>, in § 5.1</span>
     </ul>
    <li><a href="#authenticator-attachment-modality">Authenticator Attachment Modality</a><span>, in § 6.2.1</span>
    <li><a href="#authenticatorattestationresponse">AuthenticatorAttestationResponse</a><span>, in § 5.2.1</span>
+   <li><a href="#dictdef-authenticatorattestationresponsejson">AuthenticatorAttestationResponseJSON</a><span>, in § 5.1</span>
    <li><a href="#authenticatorcancel">authenticatorCancel</a><span>, in § 6.3.4</span>
    <li><a href="#authenticator-configuration">Authenticator Configuration</a><span>, in § 11.3</span>
    <li><a href="#authenticator-data">authenticator data</a><span>, in § 6.1</span>
-   <li><a href="#dom-authenticatorassertionresponse-authenticatordata">authenticatorData</a><span>, in § 5.2.2</span>
+   <li>
+    authenticatorData
+    <ul>
+     <li><a href="#dom-authenticatorassertionresponse-authenticatordata">attribute for AuthenticatorAssertionResponse</a><span>, in § 5.2.2</span>
+     <li><a href="#dom-authenticatorassertionresponsejson-authenticatordata">dict-member for AuthenticatorAssertionResponseJSON</a><span>, in § 5.1</span>
+    </ul>
    <li><a href="#authenticator-data-claimed-to-have-been-used-for-the-attestation">authenticator data claimed to have been used for the attestation</a><span>, in § 6.5.2</span>
    <li><a href="#authenticator-data-for-the-attestation">authenticator data for the attestation</a><span>, in § 6.5.2</span>
    <li><a href="#assertioncreationdata-authenticatordataresult">authenticatorDataResult</a><span>, in § 5.1.4.1</span>
@@ -7325,7 +7474,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#authenticator-model">Authenticator Model</a><span>, in § 6</span>
    <li><a href="#authenticator-operations">Authenticator Operations</a><span>, in § 6.3</span>
    <li><a href="#authenticatorresponse">AuthenticatorResponse</a><span>, in § 5.2</span>
-   <li><a href="#dom-publickeycredentialcreationoptions-authenticatorselection">authenticatorSelection</a><span>, in § 5.4</span>
+   <li>
+    authenticatorSelection
+    <ul>
+     <li><a href="#dom-publickeycredentialcreationoptions-authenticatorselection">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-authenticatorselection">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#dictdef-authenticatorselectioncriteria">AuthenticatorSelectionCriteria</a><span>, in § 5.4.4</span>
    <li><a href="#authenticator-session">authenticator session</a><span>, in § 6.3</span>
    <li><a href="#enumdef-authenticatortransport">AuthenticatorTransport</a><span>, in § 5.8.4</span>
@@ -7337,6 +7491,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#backup-eligible">Backup Eligible</a><span>, in § 4</span>
    <li><a href="#backup-state">Backup State</a><span>, in § 4</span>
    <li><a href="#base64url-encoding">Base64url Encoding</a><span>, in § 3</span>
+   <li><a href="#typedefdef-base64urlstring">Base64URLString</a><span>, in § 5.1</span>
    <li><a href="#basic">Basic</a><span>, in § 6.5.3</span>
    <li><a href="#basic-attestation">Basic Attestation</a><span>, in § 6.5.3</span>
    <li><a href="#batch-attestation">batch attestation</a><span>, in § 6.5.3</span>
@@ -7356,11 +7511,19 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <ul>
      <li><a href="#dom-collectedclientdata-challenge">dict-member for CollectedClientData</a><span>, in § 5.8.1</span>
      <li><a href="#dom-publickeycredentialcreationoptions-challenge">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-challenge">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
      <li><a href="#dom-publickeycredentialrequestoptions-challenge">dict-member for PublicKeyCredentialRequestOptions</a><span>, in § 5.5</span>
+     <li><a href="#dom-publickeycredentialrequestoptionsjson-challenge">dict-member for PublicKeyCredentialRequestOptionsJSON</a><span>, in § 5.1.9</span>
     </ul>
    <li><a href="#client">Client</a><span>, in § 4</span>
    <li><a href="#client-data">client data</a><span>, in § 5.8.1</span>
-   <li><a href="#dom-authenticatorresponse-clientdatajson">clientDataJSON</a><span>, in § 5.2</span>
+   <li>
+    clientDataJSON
+    <ul>
+     <li><a href="#dom-authenticatorresponse-clientdatajson">attribute for AuthenticatorResponse</a><span>, in § 5.2</span>
+     <li><a href="#dom-authenticatorassertionresponsejson-clientdatajson">dict-member for AuthenticatorAssertionResponseJSON</a><span>, in § 5.1</span>
+     <li><a href="#dom-authenticatorattestationresponsejson-clientdatajson">dict-member for AuthenticatorAttestationResponseJSON</a><span>, in § 5.1</span>
+    </ul>
    <li>
     clientDataJSONResult
     <ul>
@@ -7377,6 +7540,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <ul>
      <li><a href="#assertioncreationdata-clientextensionresults">dfn for assertionCreationData</a><span>, in § 5.1.4.1</span>
      <li><a href="#credentialcreationdata-clientextensionresults">dfn for credentialCreationData</a><span>, in § 5.1.3</span>
+     <li><a href="#dom-authenticationresponsejson-clientextensionresults">dict-member for AuthenticationResponseJSON</a><span>, in § 5.1</span>
+     <li><a href="#dom-registrationresponsejson-clientextensionresults">dict-member for RegistrationResponseJSON</a><span>, in § 5.1</span>
     </ul>
    <li><a href="#dom-publickeycredential-clientextensionsresults-slot">[[clientExtensionsResults]]</a><span>, in § 5.1</span>
    <li><a href="#client-platform">Client Platform</a><span>, in § 4</span>
@@ -7435,19 +7600,31 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#discoverable-credential-capable">discoverable credential capable</a><span>, in § 6.2.2</span>
    <li><a href="#dom-publickeycredential-discoverfromexternalsource-slot">[[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors)</a><span>, in § 5.1.4.1</span>
    <li><a href="#dom-publickeycredential-discovery-slot">[[discovery]]</a><span>, in § 5.1</span>
-   <li><a href="#dom-publickeycredentialuserentity-displayname">displayName</a><span>, in § 5.4.3</span>
+   <li>
+    displayName
+    <ul>
+     <li><a href="#dom-publickeycredentialuserentity-displayname">dict-member for PublicKeyCredentialUserEntity</a><span>, in § 5.4.3</span>
+     <li><a href="#dom-publickeycredentialuserentityjson-displayname">dict-member for PublicKeyCredentialUserEntityJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#effective-resident-key-requirement-for-credential-creation">effective resident key requirement for credential creation</a><span>, in § 5.1.3</span>
    <li><a href="#effective-user-verification-requirement-for-assertion">effective user verification requirement for assertion</a><span>, in § 5.1.4.1</span>
    <li><a href="#effective-user-verification-requirement-for-credential-creation">effective user verification requirement for credential creation</a><span>, in § 5.1.3</span>
    <li><a href="#dom-attestationconveyancepreference-enterprise">"enterprise"</a><span>, in § 5.4.7</span>
    <li><a href="#dom-attestationconveyancepreference-enterprise">enterprise</a><span>, in § 5.4.7</span>
-   <li><a href="#dom-publickeycredentialcreationoptions-excludecredentials">excludeCredentials</a><span>, in § 5.4</span>
+   <li>
+    excludeCredentials
+    <ul>
+     <li><a href="#dom-publickeycredentialcreationoptions-excludecredentials">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-excludecredentials">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#extension-identifier">extension identifier</a><span>, in § 9.1</span>
    <li>
     extensions
     <ul>
      <li><a href="#dom-publickeycredentialcreationoptions-extensions">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-extensions">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
      <li><a href="#dom-publickeycredentialrequestoptions-extensions">dict-member for PublicKeyCredentialRequestOptions</a><span>, in § 5.5</span>
+     <li><a href="#dom-publickeycredentialrequestoptionsjson-extensions">dict-member for PublicKeyCredentialRequestOptionsJSON</a><span>, in § 5.1.9</span>
     </ul>
    <li><a href="#first-factor-roaming-authenticator">First-factor roaming authenticator</a><span>, in § 6.2</span>
    <li><a href="#flags">flags</a><span>, in § 6.1</span>
@@ -7464,9 +7641,13 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     id
     <ul>
      <li><a href="#public-key-credential-source-id">dfn for public key credential source</a><span>, in § 4</span>
+     <li><a href="#dom-authenticationresponsejson-id">dict-member for AuthenticationResponseJSON</a><span>, in § 5.1</span>
      <li><a href="#dom-publickeycredentialdescriptor-id">dict-member for PublicKeyCredentialDescriptor</a><span>, in § 5.8.3</span>
+     <li><a href="#dom-publickeycredentialdescriptorjson-id">dict-member for PublicKeyCredentialDescriptorJSON</a><span>, in § 5.1.8</span>
      <li><a href="#dom-publickeycredentialrpentity-id">dict-member for PublicKeyCredentialRpEntity</a><span>, in § 5.4.2</span>
      <li><a href="#dom-publickeycredentialuserentity-id">dict-member for PublicKeyCredentialUserEntity</a><span>, in § 5.4.3</span>
+     <li><a href="#dom-publickeycredentialuserentityjson-id">dict-member for PublicKeyCredentialUserEntityJSON</a><span>, in § 5.1.8</span>
+     <li><a href="#dom-registrationresponsejson-id">dict-member for RegistrationResponseJSON</a><span>, in § 5.1</span>
      <li><a href="#dom-tokenbinding-id">dict-member for TokenBinding</a><span>, in § 5.8.1</span>
     </ul>
    <li><a href="#dom-publickeycredential-identifier-slot">[[identifier]]</a><span>, in § 5.1</span>
@@ -7489,7 +7670,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#multi-device-credential">multi-device credential</a><span>, in § 4</span>
    <li><a href="#multi-factor-capable">multi-factor capable</a><span>, in § 6.2.3</span>
    <li><a href="#public-key-credential-source-mutable-item">mutable item</a><span>, in § 4</span>
-   <li><a href="#dom-publickeycredentialentity-name">name</a><span>, in § 5.4.1</span>
+   <li>
+    name
+    <ul>
+     <li><a href="#dom-publickeycredentialentity-name">dict-member for PublicKeyCredentialEntity</a><span>, in § 5.4.1</span>
+     <li><a href="#dom-publickeycredentialuserentityjson-name">dict-member for PublicKeyCredentialUserEntityJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#dom-authenticatortransport-nfc">"nfc"</a><span>, in § 5.8.4</span>
    <li><a href="#dom-authenticatortransport-nfc">nfc</a><span>, in § 5.8.4</span>
    <li><a href="#non-discoverable-credential">Non-Discoverable Credential</a><span>, in § 4</span>
@@ -7499,6 +7685,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#non-resident-credential">Non-Resident Credential</a><span>, in § 4</span>
    <li><a href="#dom-collectedclientdata-origin">origin</a><span>, in § 5.8.1</span>
    <li><a href="#public-key-credential-source-otherui">otherUI</a><span>, in § 4</span>
+   <li><a href="#dom-publickeycredential-parsecreationoptionsfromjson">parseCreationOptionsFromJSON(options)</a><span>, in § 5.1.8</span>
+   <li><a href="#dom-publickeycredential-parserequestoptionsfromjson">parseRequestOptionsFromJSON(options)</a><span>, in § 5.1.9</span>
    <li><a href="#authenticator-data-perform-the-following-steps-to-generate-an-authenticator-data-structure">perform the following steps to generate an authenticator data structure</a><span>, in § 6.1</span>
    <li><a href="#dom-authenticatorattachment-platform">"platform"</a><span>, in § 5.4.5</span>
    <li><a href="#dom-authenticatorattachment-platform">platform</a><span>, in § 5.4.5</span>
@@ -7522,7 +7710,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#dom-tokenbindingstatus-present">present</a><span>, in § 5.8.1</span>
    <li><a href="#dom-publickeycredential-preventsilentaccess-slot">[[preventSilentAccess]](credential, sameOriginWithAncestors)</a><span>, in § 5.1.6</span>
    <li><a href="#public-key-credential-source-privatekey">privateKey</a><span>, in § 4</span>
-   <li><a href="#dom-publickeycredentialcreationoptions-pubkeycredparams">pubKeyCredParams</a><span>, in § 5.4</span>
+   <li>
+    pubKeyCredParams
+    <ul>
+     <li><a href="#dom-publickeycredentialcreationoptions-pubkeycredparams">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-pubkeycredparams">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#dom-publickeycredentialtype-public-key">"public-key"</a><span>, in § 5.8.2</span>
    <li><a href="#dom-publickeycredentialtype-public-key">public-key</a><span>, in § 5.8.2</span>
    <li>
@@ -7534,21 +7727,33 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#public-key-credential">Public Key Credential</a><span>, in § 4</span>
    <li><a href="#publickeycredential">PublicKeyCredential</a><span>, in § 5.1</span>
    <li><a href="#dictdef-publickeycredentialcreationoptions">PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+   <li><a href="#dictdef-publickeycredentialcreationoptionsjson">PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
    <li><a href="#dictdef-publickeycredentialdescriptor">PublicKeyCredentialDescriptor</a><span>, in § 5.8.3</span>
+   <li><a href="#dictdef-publickeycredentialdescriptorjson">PublicKeyCredentialDescriptorJSON</a><span>, in § 5.1.8</span>
    <li><a href="#dictdef-publickeycredentialentity">PublicKeyCredentialEntity</a><span>, in § 5.4.1</span>
+   <li><a href="#typedefdef-publickeycredentialjson">PublicKeyCredentialJSON</a><span>, in § 5.1</span>
    <li><a href="#dictdef-publickeycredentialparameters">PublicKeyCredentialParameters</a><span>, in § 5.3</span>
    <li><a href="#dictdef-publickeycredentialrequestoptions">PublicKeyCredentialRequestOptions</a><span>, in § 5.5</span>
+   <li><a href="#dictdef-publickeycredentialrequestoptionsjson">PublicKeyCredentialRequestOptionsJSON</a><span>, in § 5.1.9</span>
    <li><a href="#dictdef-publickeycredentialrpentity">PublicKeyCredentialRpEntity</a><span>, in § 5.4.2</span>
    <li><a href="#publickey-credentials-get-feature">publickey-credentials-get-feature</a><span>, in § 5.9</span>
    <li><a href="#public-key-credential-source">Public Key Credential Source</a><span>, in § 4</span>
    <li><a href="#enumdef-publickeycredentialtype">PublicKeyCredentialType</a><span>, in § 5.8.2</span>
    <li><a href="#dictdef-publickeycredentialuserentity">PublicKeyCredentialUserEntity</a><span>, in § 5.4.3</span>
+   <li><a href="#dictdef-publickeycredentialuserentityjson">PublicKeyCredentialUserEntityJSON</a><span>, in § 5.1.8</span>
    <li><a href="#rate-limiting">Rate Limiting</a><span>, in § 4</span>
-   <li><a href="#dom-publickeycredential-rawid">rawId</a><span>, in § 5.1</span>
+   <li>
+    rawId
+    <ul>
+     <li><a href="#dom-publickeycredential-rawid">attribute for PublicKeyCredential</a><span>, in § 5.1</span>
+     <li><a href="#dom-authenticationresponsejson-rawid">dict-member for AuthenticationResponseJSON</a><span>, in § 5.1</span>
+     <li><a href="#dom-registrationresponsejson-rawid">dict-member for RegistrationResponseJSON</a><span>, in § 5.1</span>
+    </ul>
    <li><a href="#dom-authenticationextensionslargeblobinputs-read">read</a><span>, in § 10.5</span>
    <li><a href="#registration">Registration</a><span>, in § 4</span>
    <li><a href="#registration-ceremony">Registration Ceremony</a><span>, in § 4</span>
    <li><a href="#registration-extension">registration extension</a><span>, in § 9</span>
+   <li><a href="#dictdef-registrationresponsejson">RegistrationResponseJSON</a><span>, in § 5.1</span>
    <li><a href="#relying-party">Relying Party</a><span>, in § 4</span>
    <li><a href="#relying-party-identifier">Relying Party Identifier</a><span>, in § 4</span>
    <li><a href="#remove-all-credentials">Remove All Credentials</a><span>, in § 11.8</span>
@@ -7573,17 +7778,29 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#dom-authenticatorselectioncriteria-residentkey">residentKey</a><span>, in § 5.4.4</span>
    <li><a href="#credentialpropertiesoutput-resident-key-credential-property">resident key credential property</a><span>, in § 10.4</span>
    <li><a href="#enumdef-residentkeyrequirement">ResidentKeyRequirement</a><span>, in § 5.4.6</span>
-   <li><a href="#dom-publickeycredential-response">response</a><span>, in § 5.1</span>
+   <li>
+    response
+    <ul>
+     <li><a href="#dom-publickeycredential-response">attribute for PublicKeyCredential</a><span>, in § 5.1</span>
+     <li><a href="#dom-authenticationresponsejson-response">dict-member for AuthenticationResponseJSON</a><span>, in § 5.1</span>
+     <li><a href="#dom-registrationresponsejson-response">dict-member for RegistrationResponseJSON</a><span>, in § 5.1</span>
+    </ul>
    <li><a href="#dom-credentialpropertiesoutput-rk">rk</a><span>, in § 10.4</span>
    <li><a href="#roaming-authenticators">roaming authenticators</a><span>, in § 6.2.1</span>
    <li><a href="#roaming-credential">roaming credential</a><span>, in § 6.2.1</span>
-   <li><a href="#dom-publickeycredentialcreationoptions-rp">rp</a><span>, in § 5.4</span>
+   <li>
+    rp
+    <ul>
+     <li><a href="#dom-publickeycredentialcreationoptions-rp">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-rp">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#rp-id">RP ID</a><span>, in § 4</span>
    <li>
     rpId
     <ul>
      <li><a href="#public-key-credential-source-rpid">dfn for public key credential source</a><span>, in § 4</span>
      <li><a href="#dom-publickeycredentialrequestoptions-rpid">dict-member for PublicKeyCredentialRequestOptions</a><span>, in § 5.5</span>
+     <li><a href="#dom-publickeycredentialrequestoptionsjson-rpid">dict-member for PublicKeyCredentialRequestOptionsJSON</a><span>, in § 5.1.9</span>
     </ul>
    <li><a href="#rpidhash">rpIdHash</a><span>, in § 6.1</span>
    <li><a href="#scope">scope</a><span>, in § 4</span>
@@ -7596,7 +7813,12 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#server-side-credential-storage-modality">server-side credential storage modality</a><span>, in § 6.2.2</span>
    <li><a href="#server-side-public-key-credential-source">Server-side Public Key Credential Source</a><span>, in § 4</span>
    <li><a href="#set-user-verified">Set User Verified</a><span>, in § 11.9</span>
-   <li><a href="#dom-authenticatorassertionresponse-signature">signature</a><span>, in § 5.2.2</span>
+   <li>
+    signature
+    <ul>
+     <li><a href="#dom-authenticatorassertionresponse-signature">attribute for AuthenticatorAssertionResponse</a><span>, in § 5.2.2</span>
+     <li><a href="#dom-authenticatorassertionresponsejson-signature">dict-member for AuthenticatorAssertionResponseJSON</a><span>, in § 5.1</span>
+    </ul>
    <li><a href="#signature-counter">Signature Counter</a><span>, in § 6.1.1</span>
    <li><a href="#assertioncreationdata-signatureresult">signatureResult</a><span>, in § 5.1.4.1</span>
    <li><a href="#signcount">signCount</a><span>, in § 6.1</span>
@@ -7618,27 +7840,44 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     timeout
     <ul>
      <li><a href="#dom-publickeycredentialcreationoptions-timeout">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-timeout">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
      <li><a href="#dom-publickeycredentialrequestoptions-timeout">dict-member for PublicKeyCredentialRequestOptions</a><span>, in § 5.5</span>
+     <li><a href="#dom-publickeycredentialrequestoptionsjson-timeout">dict-member for PublicKeyCredentialRequestOptionsJSON</a><span>, in § 5.1.9</span>
     </ul>
+   <li><a href="#dom-publickeycredential-tojson">toJSON()</a><span>, in § 5.1</span>
    <li><a href="#dictdef-tokenbinding">TokenBinding</a><span>, in § 5.8.1</span>
    <li><a href="#collectedclientdata-tokenbinding">tokenBinding</a><span>, in § 5.8.1</span>
    <li><a href="#enumdef-tokenbindingstatus">TokenBindingStatus</a><span>, in § 5.8.1</span>
    <li><a href="#dom-authenticatorattestationresponse-transports-slot">[[transports]]</a><span>, in § 5.2.1</span>
-   <li><a href="#dom-publickeycredentialdescriptor-transports">transports</a><span>, in § 5.8.3</span>
+   <li>
+    transports
+    <ul>
+     <li><a href="#dom-authenticatorattestationresponsejson-transports">dict-member for AuthenticatorAttestationResponseJSON</a><span>, in § 5.1</span>
+     <li><a href="#dom-publickeycredentialdescriptor-transports">dict-member for PublicKeyCredentialDescriptor</a><span>, in § 5.8.3</span>
+     <li><a href="#dom-publickeycredentialdescriptorjson-transports">dict-member for PublicKeyCredentialDescriptorJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#dom-publickeycredential-type-slot">[[type]]</a><span>, in § 5.1</span>
    <li>
     type
     <ul>
      <li><a href="#public-key-credential-source-type">dfn for public key credential source</a><span>, in § 4</span>
+     <li><a href="#dom-authenticationresponsejson-type">dict-member for AuthenticationResponseJSON</a><span>, in § 5.1</span>
      <li><a href="#dom-collectedclientdata-type">dict-member for CollectedClientData</a><span>, in § 5.8.1</span>
      <li><a href="#dom-publickeycredentialdescriptor-type">dict-member for PublicKeyCredentialDescriptor</a><span>, in § 5.8.3</span>
+     <li><a href="#dom-publickeycredentialdescriptorjson-type">dict-member for PublicKeyCredentialDescriptorJSON</a><span>, in § 5.1.8</span>
      <li><a href="#dom-publickeycredentialparameters-type">dict-member for PublicKeyCredentialParameters</a><span>, in § 5.3</span>
+     <li><a href="#dom-registrationresponsejson-type">dict-member for RegistrationResponseJSON</a><span>, in § 5.1</span>
     </ul>
    <li><a href="#ui-redressing">UI Redressing</a><span>, in § 13.4.2</span>
    <li><a href="#up">UP</a><span>, in § 4</span>
    <li><a href="#dom-authenticatortransport-usb">"usb"</a><span>, in § 5.8.4</span>
    <li><a href="#dom-authenticatortransport-usb">usb</a><span>, in § 5.8.4</span>
-   <li><a href="#dom-publickeycredentialcreationoptions-user">user</a><span>, in § 5.4</span>
+   <li>
+    user
+    <ul>
+     <li><a href="#dom-publickeycredentialcreationoptions-user">dict-member for PublicKeyCredentialCreationOptions</a><span>, in § 5.4</span>
+     <li><a href="#dom-publickeycredentialcreationoptionsjson-user">dict-member for PublicKeyCredentialCreationOptionsJSON</a><span>, in § 5.1.8</span>
+    </ul>
    <li><a href="#user-account">User Account</a><span>, in § 4</span>
    <li><a href="#user-consent">User Consent</a><span>, in § 4</span>
    <li><a href="#user-handle">User Handle</a><span>, in § 4</span>
@@ -7647,6 +7886,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <ul>
      <li><a href="#dom-authenticatorassertionresponse-userhandle">attribute for AuthenticatorAssertionResponse</a><span>, in § 5.2.2</span>
      <li><a href="#public-key-credential-source-userhandle">dfn for public key credential source</a><span>, in § 4</span>
+     <li><a href="#dom-authenticatorassertionresponsejson-userhandle">dict-member for AuthenticatorAssertionResponseJSON</a><span>, in § 5.1</span>
     </ul>
    <li><a href="#assertioncreationdata-userhandleresult">userHandleResult</a><span>, in § 5.1.4.1</span>
    <li><a href="#concept-user-present">User Present</a><span>, in § 4</span>
@@ -7657,6 +7897,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <ul>
      <li><a href="#dom-authenticatorselectioncriteria-userverification">dict-member for AuthenticatorSelectionCriteria</a><span>, in § 5.4.4</span>
      <li><a href="#dom-publickeycredentialrequestoptions-userverification">dict-member for PublicKeyCredentialRequestOptions</a><span>, in § 5.5</span>
+     <li><a href="#dom-publickeycredentialrequestoptionsjson-userverification">dict-member for PublicKeyCredentialRequestOptionsJSON</a><span>, in § 5.1.9</span>
     </ul>
    <li><a href="#user-verification-method">User Verification Method</a><span>, in § 10.3</span>
    <li><a href="#enumdef-userverificationrequirement">UserVerificationRequirement</a><span>, in § 5.8.6</span>
@@ -8589,14 +8830,14 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
   <aside class="dfn-panel" data-for="term-for-idl-ArrayBuffer">
    <a href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer">https://webidl.spec.whatwg.org/#idl-ArrayBuffer</a><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-idl-ArrayBuffer">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-idl-ArrayBuffer①">(2)</a>
-    <li><a href="#ref-for-idl-ArrayBuffer②">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-idl-ArrayBuffer③">(2)</a> <a href="#ref-for-idl-ArrayBuffer④">(3)</a>
-    <li><a href="#ref-for-idl-ArrayBuffer⑤">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-idl-ArrayBuffer⑥">(2)</a> <a href="#ref-for-idl-ArrayBuffer⑦">(3)</a> <a href="#ref-for-idl-ArrayBuffer⑧">(4)</a> <a href="#ref-for-idl-ArrayBuffer⑨">(5)</a> <a href="#ref-for-idl-ArrayBuffer①⓪">(6)</a>
-    <li><a href="#ref-for-idl-ArrayBuffer①①">5.2. Authenticator Responses (interface AuthenticatorResponse)</a> <a href="#ref-for-idl-ArrayBuffer①②">(2)</a>
-    <li><a href="#ref-for-idl-ArrayBuffer①③">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a> <a href="#ref-for-idl-ArrayBuffer①④">(2)</a> <a href="#ref-for-idl-ArrayBuffer①⑤">(3)</a> <a href="#ref-for-idl-ArrayBuffer①⑥">(4)</a>
-    <li><a href="#ref-for-idl-ArrayBuffer①⑦">5.2.1.1. Easily accessing credential data</a>
-    <li><a href="#ref-for-idl-ArrayBuffer①⑧">5.2.2. Web Authentication Assertion (interface AuthenticatorAssertionResponse)</a> <a href="#ref-for-idl-ArrayBuffer①⑨">(2)</a> <a href="#ref-for-idl-ArrayBuffer②⓪">(3)</a> <a href="#ref-for-idl-ArrayBuffer②①">(4)</a> <a href="#ref-for-idl-ArrayBuffer②②">(5)</a> <a href="#ref-for-idl-ArrayBuffer②③">(6)</a>
-    <li><a href="#ref-for-idl-ArrayBuffer②④">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-idl-ArrayBuffer②⑤">(2)</a>
+    <li><a href="#ref-for-idl-ArrayBuffer">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-idl-ArrayBuffer①">(2)</a> <a href="#ref-for-idl-ArrayBuffer②">(3)</a> <a href="#ref-for-idl-ArrayBuffer③">(4)</a> <a href="#ref-for-idl-ArrayBuffer④">(5)</a>
+    <li><a href="#ref-for-idl-ArrayBuffer⑤">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-idl-ArrayBuffer⑥">(2)</a> <a href="#ref-for-idl-ArrayBuffer⑦">(3)</a>
+    <li><a href="#ref-for-idl-ArrayBuffer⑧">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-idl-ArrayBuffer⑨">(2)</a> <a href="#ref-for-idl-ArrayBuffer①⓪">(3)</a> <a href="#ref-for-idl-ArrayBuffer①①">(4)</a> <a href="#ref-for-idl-ArrayBuffer①②">(5)</a> <a href="#ref-for-idl-ArrayBuffer①③">(6)</a>
+    <li><a href="#ref-for-idl-ArrayBuffer①④">5.2. Authenticator Responses (interface AuthenticatorResponse)</a> <a href="#ref-for-idl-ArrayBuffer①⑤">(2)</a>
+    <li><a href="#ref-for-idl-ArrayBuffer①⑥">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a> <a href="#ref-for-idl-ArrayBuffer①⑦">(2)</a> <a href="#ref-for-idl-ArrayBuffer①⑧">(3)</a> <a href="#ref-for-idl-ArrayBuffer①⑨">(4)</a>
+    <li><a href="#ref-for-idl-ArrayBuffer②⓪">5.2.1.1. Easily accessing credential data</a>
+    <li><a href="#ref-for-idl-ArrayBuffer②①">5.2.2. Web Authentication Assertion (interface AuthenticatorAssertionResponse)</a> <a href="#ref-for-idl-ArrayBuffer②②">(2)</a> <a href="#ref-for-idl-ArrayBuffer②③">(3)</a> <a href="#ref-for-idl-ArrayBuffer②④">(4)</a> <a href="#ref-for-idl-ArrayBuffer②⑤">(5)</a> <a href="#ref-for-idl-ArrayBuffer②⑥">(6)</a>
+    <li><a href="#ref-for-idl-ArrayBuffer②⑦">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-idl-ArrayBuffer②⑧">(2)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-BufferSource">
@@ -8625,28 +8866,39 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <li><a href="#ref-for-idl-DOMException⑨">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-idl-DOMException①⓪">(2)</a> <a href="#ref-for-idl-DOMException①①">(3)</a> <a href="#ref-for-idl-DOMException①②">(4)</a> <a href="#ref-for-idl-DOMException①③">(5)</a> <a href="#ref-for-idl-DOMException①④">(6)</a>
     <li><a href="#ref-for-idl-DOMException①⑤">5.1.5. Store an Existing Credential - PublicKeyCredential’s [[Store]](credential, sameOriginWithAncestors) Method</a>
     <li><a href="#ref-for-idl-DOMException①⑥">5.1.7. Availability of User-Verifying Platform Authenticator - PublicKeyCredential’s isUserVerifyingPlatformAuthenticatorAvailable() Method</a>
-    <li><a href="#ref-for-idl-DOMException①⑦">10.1. FIDO AppID Extension (appid)</a>
-    <li><a href="#ref-for-idl-DOMException①⑧">10.2. FIDO AppID Exclusion Extension (appidExclude)</a>
-    <li><a href="#ref-for-idl-DOMException①⑨">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-idl-DOMException②⓪">(2)</a> <a href="#ref-for-idl-DOMException②①">(3)</a> <a href="#ref-for-idl-DOMException②②">(4)</a>
+    <li><a href="#ref-for-idl-DOMException①⑦">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-idl-DOMException①⑧">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+    <li><a href="#ref-for-idl-DOMException①⑨">10.1. FIDO AppID Extension (appid)</a>
+    <li><a href="#ref-for-idl-DOMException②⓪">10.2. FIDO AppID Exclusion Extension (appidExclude)</a>
+    <li><a href="#ref-for-idl-DOMException②①">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-idl-DOMException②②">(2)</a> <a href="#ref-for-idl-DOMException②③">(3)</a> <a href="#ref-for-idl-DOMException②④">(4)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-idl-DOMString">
    <a href="https://webidl.spec.whatwg.org/#idl-DOMString">https://webidl.spec.whatwg.org/#idl-DOMString</a><b>Referenced in:</b>
    <ul>
     <li><a href="#ref-for-idl-DOMString">2.1.1. Enumerations as DOMString types</a>
-    <li><a href="#ref-for-idl-DOMString①">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-idl-DOMString②">(2)</a>
-    <li><a href="#ref-for-idl-DOMString③">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a>
-    <li><a href="#ref-for-idl-DOMString④">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a> <a href="#ref-for-idl-DOMString⑤">(2)</a>
-    <li><a href="#ref-for-idl-DOMString⑥">5.3. Parameters for Credential Generation (dictionary PublicKeyCredentialParameters)</a> <a href="#ref-for-idl-DOMString⑦">(2)</a>
-    <li><a href="#ref-for-idl-DOMString⑧">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-idl-DOMString⑨">(2)</a>
-    <li><a href="#ref-for-idl-DOMString①⓪">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> <a href="#ref-for-idl-DOMString①①">(2)</a>
-    <li><a href="#ref-for-idl-DOMString①②">5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)</a> <a href="#ref-for-idl-DOMString①③">(2)</a>
-    <li><a href="#ref-for-idl-DOMString①④">5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)</a> <a href="#ref-for-idl-DOMString①⑤">(2)</a>
-    <li><a href="#ref-for-idl-DOMString①⑥">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a> <a href="#ref-for-idl-DOMString①⑦">(2)</a> <a href="#ref-for-idl-DOMString①⑧">(3)</a> <a href="#ref-for-idl-DOMString①⑨">(4)</a> <a href="#ref-for-idl-DOMString②⓪">(5)</a> <a href="#ref-for-idl-DOMString②①">(6)</a>
-    <li><a href="#ref-for-idl-DOMString②②">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-idl-DOMString②③">(2)</a>
-    <li><a href="#ref-for-idl-DOMString②④">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a> <a href="#ref-for-idl-DOMString②⑤">(2)</a> <a href="#ref-for-idl-DOMString②⑥">(3)</a> <a href="#ref-for-idl-DOMString②⑦">(4)</a> <a href="#ref-for-idl-DOMString②⑧">(5)</a> <a href="#ref-for-idl-DOMString②⑨">(6)</a> <a href="#ref-for-idl-DOMString③⓪">(7)</a> <a href="#ref-for-idl-DOMString③①">(8)</a> <a href="#ref-for-idl-DOMString③②">(9)</a> <a href="#ref-for-idl-DOMString③③">(10)</a>
-    <li><a href="#ref-for-idl-DOMString③④">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-idl-DOMString③⑤">(2)</a> <a href="#ref-for-idl-DOMString③⑥">(3)</a> <a href="#ref-for-idl-DOMString③⑦">(4)</a>
-    <li><a href="#ref-for-idl-DOMString③⑧">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-idl-DOMString③⑨">(2)</a>
+    <li><a href="#ref-for-idl-DOMString①">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-idl-DOMString②">(2)</a> <a href="#ref-for-idl-DOMString③">(3)</a> <a href="#ref-for-idl-DOMString④">(4)</a> <a href="#ref-for-idl-DOMString⑤">(5)</a> <a href="#ref-for-idl-DOMString⑥">(6)</a> <a href="#ref-for-idl-DOMString⑦">(7)</a> <a href="#ref-for-idl-DOMString⑧">(8)</a> <a href="#ref-for-idl-DOMString⑨">(9)</a> <a href="#ref-for-idl-DOMString①⓪">(10)</a>
+    <li><a href="#ref-for-idl-DOMString①①">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a>
+    <li><a href="#ref-for-idl-DOMString①②">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a> <a href="#ref-for-idl-DOMString①③">(2)</a> <a href="#ref-for-idl-DOMString①④">(3)</a> <a href="#ref-for-idl-DOMString①⑤">(4)</a> <a href="#ref-for-idl-DOMString①⑥">(5)</a> <a href="#ref-for-idl-DOMString①⑦">(6)</a>
+    <li><a href="#ref-for-idl-DOMString①⑧">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a> <a href="#ref-for-idl-DOMString①⑨">(2)</a> <a href="#ref-for-idl-DOMString②⓪">(3)</a>
+    <li><a href="#ref-for-idl-DOMString②①">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a> <a href="#ref-for-idl-DOMString②②">(2)</a>
+    <li><a href="#ref-for-idl-DOMString②③">5.3. Parameters for Credential Generation (dictionary PublicKeyCredentialParameters)</a> <a href="#ref-for-idl-DOMString②④">(2)</a>
+    <li><a href="#ref-for-idl-DOMString②⑤">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-idl-DOMString②⑥">(2)</a>
+    <li><a href="#ref-for-idl-DOMString②⑦">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> <a href="#ref-for-idl-DOMString②⑧">(2)</a>
+    <li><a href="#ref-for-idl-DOMString②⑨">5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)</a> <a href="#ref-for-idl-DOMString③⓪">(2)</a>
+    <li><a href="#ref-for-idl-DOMString③①">5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)</a> <a href="#ref-for-idl-DOMString③②">(2)</a>
+    <li><a href="#ref-for-idl-DOMString③③">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a> <a href="#ref-for-idl-DOMString③④">(2)</a> <a href="#ref-for-idl-DOMString③⑤">(3)</a> <a href="#ref-for-idl-DOMString③⑥">(4)</a> <a href="#ref-for-idl-DOMString③⑦">(5)</a> <a href="#ref-for-idl-DOMString③⑧">(6)</a>
+    <li><a href="#ref-for-idl-DOMString③⑨">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-idl-DOMString④⓪">(2)</a>
+    <li><a href="#ref-for-idl-DOMString④①">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a> <a href="#ref-for-idl-DOMString④②">(2)</a> <a href="#ref-for-idl-DOMString④③">(3)</a> <a href="#ref-for-idl-DOMString④④">(4)</a> <a href="#ref-for-idl-DOMString④⑤">(5)</a> <a href="#ref-for-idl-DOMString④⑥">(6)</a> <a href="#ref-for-idl-DOMString④⑦">(7)</a> <a href="#ref-for-idl-DOMString④⑧">(8)</a> <a href="#ref-for-idl-DOMString④⑨">(9)</a> <a href="#ref-for-idl-DOMString⑤⓪">(10)</a>
+    <li><a href="#ref-for-idl-DOMString⑤①">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-idl-DOMString⑤②">(2)</a> <a href="#ref-for-idl-DOMString⑤③">(3)</a> <a href="#ref-for-idl-DOMString⑤④">(4)</a>
+    <li><a href="#ref-for-idl-DOMString⑤⑤">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-idl-DOMString⑤⑥">(2)</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-encodingerror">
+   <a href="https://webidl.spec.whatwg.org/#encodingerror">https://webidl.spec.whatwg.org/#encodingerror</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-encodingerror">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-encodingerror①">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-Exposed">
@@ -8757,6 +9009,13 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <li><a href="#ref-for-idl-boolean①①">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-idl-boolean①②">(2)</a> <a href="#ref-for-idl-boolean①③">(3)</a> <a href="#ref-for-idl-boolean①④">(4)</a> <a href="#ref-for-idl-boolean①⑤">(5)</a> <a href="#ref-for-idl-boolean①⑥">(6)</a>
    </ul>
   </aside>
+  <aside class="dfn-panel" data-for="term-for-dfn-buffer-source-type">
+   <a href="https://webidl.spec.whatwg.org/#dfn-buffer-source-type">https://webidl.spec.whatwg.org/#dfn-buffer-source-type</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dfn-buffer-source-type">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-dfn-buffer-source-type①">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+   </ul>
+  </aside>
   <aside class="dfn-panel" data-for="term-for-dfn-get-buffer-source-reference">
    <a href="https://heycam.github.io/webidl#dfn-get-buffer-source-reference">https://heycam.github.io/webidl#dfn-get-buffer-source-reference</a><b>Referenced in:</b>
    <ul>
@@ -8771,6 +9030,14 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
     <li><a href="#ref-for-dfn-interface-object③">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a>
    </ul>
   </aside>
+  <aside class="dfn-panel" data-for="term-for-dfn-json-types">
+   <a href="https://webidl.spec.whatwg.org/#dfn-json-types">https://webidl.spec.whatwg.org/#dfn-json-types</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dfn-json-types">5.1. PublicKeyCredential Interface</a>
+    <li><a href="#ref-for-dfn-json-types①">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a> <a href="#ref-for-dfn-json-types②">(2)</a>
+    <li><a href="#ref-for-dfn-json-types③">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a> <a href="#ref-for-dfn-json-types④">(2)</a>
+   </ul>
+  </aside>
   <aside class="dfn-panel" data-for="term-for-idl-long">
    <a href="https://webidl.spec.whatwg.org/#idl-long">https://webidl.spec.whatwg.org/#idl-long</a><b>Referenced in:</b>
    <ul>
@@ -8780,19 +9047,24 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
   <aside class="dfn-panel" data-for="term-for-idl-sequence">
    <a href="https://webidl.spec.whatwg.org/#idl-sequence">https://webidl.spec.whatwg.org/#idl-sequence</a><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-idl-sequence">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a>
-    <li><a href="#ref-for-idl-sequence①">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-idl-sequence②">(2)</a>
-    <li><a href="#ref-for-idl-sequence③">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a>
-    <li><a href="#ref-for-idl-sequence④">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a>
-    <li><a href="#ref-for-idl-sequence⑤">10.3. User Verification Method Extension (uvm)</a> <a href="#ref-for-idl-sequence⑥">(2)</a>
+    <li><a href="#ref-for-idl-sequence">5.1. PublicKeyCredential Interface</a>
+    <li><a href="#ref-for-idl-sequence①">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a> <a href="#ref-for-idl-sequence②">(2)</a> <a href="#ref-for-idl-sequence③">(3)</a>
+    <li><a href="#ref-for-idl-sequence④">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+    <li><a href="#ref-for-idl-sequence⑤">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a>
+    <li><a href="#ref-for-idl-sequence⑥">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-idl-sequence⑦">(2)</a>
+    <li><a href="#ref-for-idl-sequence⑧">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a>
+    <li><a href="#ref-for-idl-sequence⑨">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a>
+    <li><a href="#ref-for-idl-sequence①⓪">10.3. User Verification Method Extension (uvm)</a> <a href="#ref-for-idl-sequence①①">(2)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-idl-unsigned-long">
    <a href="https://webidl.spec.whatwg.org/#idl-unsigned-long">https://webidl.spec.whatwg.org/#idl-unsigned-long</a><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-idl-unsigned-long">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-idl-unsigned-long①">(2)</a>
-    <li><a href="#ref-for-idl-unsigned-long②">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-idl-unsigned-long③">(2)</a>
-    <li><a href="#ref-for-idl-unsigned-long④">10.3. User Verification Method Extension (uvm)</a>
+    <li><a href="#ref-for-idl-unsigned-long">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-idl-unsigned-long①">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+    <li><a href="#ref-for-idl-unsigned-long②">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-idl-unsigned-long③">(2)</a>
+    <li><a href="#ref-for-idl-unsigned-long④">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-idl-unsigned-long⑤">(2)</a>
+    <li><a href="#ref-for-idl-unsigned-long⑥">10.3. User Verification Method Extension (uvm)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="term-for-focus">
@@ -9035,6 +9307,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
      <li><span class="dfn-paneled" id="term-for-constrainterror">ConstraintError</span>
      <li><span class="dfn-paneled" id="term-for-idl-DOMException">DOMException</span>
      <li><span class="dfn-paneled" id="term-for-idl-DOMString">DOMString</span>
+     <li><span class="dfn-paneled" id="term-for-encodingerror">EncodingError</span>
      <li><span class="dfn-paneled" id="term-for-Exposed">Exposed</span>
      <li><span class="dfn-paneled" id="term-for-invalidstateerror">InvalidStateError</span>
      <li><span class="dfn-paneled" id="term-for-notallowederror">NotAllowedError</span>
@@ -9047,8 +9320,10 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
      <li><span class="dfn-paneled" id="term-for-idl-USVString">USVString</span>
      <li><span class="dfn-paneled" id="term-for-unknownerror">UnknownError</span>
      <li><span class="dfn-paneled" id="term-for-idl-boolean">boolean</span>
+     <li><span class="dfn-paneled" id="term-for-dfn-buffer-source-type">buffer source types</span>
      <li><span class="dfn-paneled" id="term-for-dfn-get-buffer-source-reference">get a copy of the bytes held by the buffer source</span>
      <li><span class="dfn-paneled" id="term-for-dfn-interface-object">interface object</span>
+     <li><span class="dfn-paneled" id="term-for-dfn-json-types">json type</span>
      <li><span class="dfn-paneled" id="term-for-idl-long">long</span>
      <li><span class="dfn-paneled" id="term-for-idl-sequence">sequence</span>
      <li><span class="dfn-paneled" id="term-for-idl-unsigned-long">unsigned long</span>
@@ -9210,6 +9485,44 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
     [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="#authenticatorresponse"><c- n>AuthenticatorResponse</c-></a>    <a class="idl-code" data-link-type="attribute" data-readonly data-type="AuthenticatorResponse" href="#dom-publickeycredential-response"><c- g>response</c-></a>;
     [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>?               <a class="idl-code" data-link-type="attribute" data-readonly data-type="DOMString?" href="#dom-publickeycredential-authenticatorattachment"><c- g>authenticatorAttachment</c-></a>;
     <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientoutputs"><c- n>AuthenticationExtensionsClientOutputs</c-></a> <a href="#dom-publickeycredential-getclientextensionresults"><code><c- g>getClientExtensionResults</c-></code></a>();
+    <a data-link-type="idl-name" href="#typedefdef-publickeycredentialjson"><c- n>PublicKeyCredentialJSON</c-></a> <a href="#dom-publickeycredential-tojson"><code><c- g>toJSON</c-></code></a>();
+};
+
+<c- b>typedef</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a> <a href="#typedefdef-base64urlstring"><code><c- g>Base64URLString</c-></code></a>;
+<c- b>typedef</c-> (<a data-link-type="idl-name" href="#dictdef-registrationresponsejson"><c- n>RegistrationResponseJSON</c-></a> <c- b>or</c-> <a data-link-type="idl-name" href="#dictdef-authenticationresponsejson"><c- n>AuthenticationResponseJSON</c-></a>) <a href="#typedefdef-publickeycredentialjson"><code><c- g>PublicKeyCredentialJSON</c-></code></a>;
+
+<c- b>dictionary</c-> <a href="#dictdef-registrationresponsejson"><code><c- g>RegistrationResponseJSON</c-></code></a> {
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-registrationresponsejson-id"><code><c- g>id</c-></code></a>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-registrationresponsejson-rawid"><code><c- g>rawId</c-></code></a>;
+    <a data-link-type="idl-name" href="#dictdef-authenticatorattestationresponsejson"><c- n>AuthenticatorAttestationResponseJSON</c-></a> <a data-type="AuthenticatorAttestationResponseJSON " href="#dom-registrationresponsejson-response"><code><c- g>response</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>?  <a data-type="DOMString?  " href="#dom-registrationresponsejson-authenticatorattachment"><code><c- g>authenticatorAttachment</c-></code></a>;
+    <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientoutputsjson"><c- n>AuthenticationExtensionsClientOutputsJSON</c-></a> <a data-type="AuthenticationExtensionsClientOutputsJSON " href="#dom-registrationresponsejson-clientextensionresults"><code><c- g>clientExtensionResults</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a> <a data-type="DOMString " href="#dom-registrationresponsejson-type"><code><c- g>type</c-></code></a>;
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-authenticatorattestationresponsejson"><code><c- g>AuthenticatorAttestationResponseJSON</c-></code></a> {
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-authenticatorattestationresponsejson-clientdatajson"><code><c- g>clientDataJSON</c-></code></a>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-authenticatorattestationresponsejson-attestationobject"><code><c- g>attestationObject</c-></code></a>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>> <a data-type="sequence<DOMString> " href="#dom-authenticatorattestationresponsejson-transports"><code><c- g>transports</c-></code></a>;
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-authenticationresponsejson"><code><c- g>AuthenticationResponseJSON</c-></code></a> {
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-authenticationresponsejson-id"><code><c- g>id</c-></code></a>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-authenticationresponsejson-rawid"><code><c- g>rawId</c-></code></a>;
+    <a data-link-type="idl-name" href="#dictdef-authenticatorassertionresponsejson"><c- n>AuthenticatorAssertionResponseJSON</c-></a> <a data-type="AuthenticatorAssertionResponseJSON " href="#dom-authenticationresponsejson-response"><code><c- g>response</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>?  <a data-type="DOMString?  " href="#dom-authenticationresponsejson-authenticatorattachment"><code><c- g>authenticatorAttachment</c-></code></a>;
+    <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientoutputsjson"><c- n>AuthenticationExtensionsClientOutputsJSON</c-></a> <a data-type="AuthenticationExtensionsClientOutputsJSON " href="#dom-authenticationresponsejson-clientextensionresults"><code><c- g>clientExtensionResults</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a> <a data-type="DOMString " href="#dom-authenticationresponsejson-type"><code><c- g>type</c-></code></a>;
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-authenticatorassertionresponsejson"><code><c- g>AuthenticatorAssertionResponseJSON</c-></code></a> {
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-authenticatorassertionresponsejson-clientdatajson"><code><c- g>clientDataJSON</c-></code></a>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-authenticatorassertionresponsejson-authenticatordata"><code><c- g>authenticatorData</c-></code></a>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a> <a data-type="Base64URLString " href="#dom-authenticatorassertionresponsejson-signature"><code><c- g>signature</c-></code></a>;
+    <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a>? <a data-type="Base64URLString? " href="#dom-authenticatorassertionresponsejson-userhandle"><code><c- g>userHandle</c-></code></a>;
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-authenticationextensionsclientoutputsjson"><code><c- g>AuthenticationExtensionsClientOutputsJSON</c-></code></a> {
 };
 
 <c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="https://w3c.github.io/webappsec-credential-management/#dictdef-credentialcreationoptions"><c- g>CredentialCreationOptions</c-></a> {
@@ -9224,6 +9537,50 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
     <c- b>static</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a>> <a href="#dom-publickeycredential-isuserverifyingplatformauthenticatoravailable"><code><c- g>isUserVerifyingPlatformAuthenticatorAvailable</c-></code></a>();
 };
 
+<c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential"><c- g>PublicKeyCredential</c-></a> {
+    <c- b>static</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialcreationoptions"><c- n>PublicKeyCredentialCreationOptions</c-></a> <a href="#dom-publickeycredential-parsecreationoptionsfromjson"><code><c- g>parseCreationOptionsFromJSON</c-></code></a>(<a data-link-type="idl-name" href="#dictdef-publickeycredentialcreationoptionsjson"><c- n>PublicKeyCredentialCreationOptionsJSON</c-></a> <a href="#dom-publickeycredential-parsecreationoptionsfromjson-options-options"><code><c- g>options</c-></code></a>);
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-publickeycredentialcreationoptionsjson"><code><c- g>PublicKeyCredentialCreationOptionsJSON</c-></code></a> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrpentity"><c- n>PublicKeyCredentialRpEntity</c-></a>                    <a data-type="PublicKeyCredentialRpEntity                    " href="#dom-publickeycredentialcreationoptionsjson-rp"><code><c- g>rp</c-></code></a>;
+    <c- b>required</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialuserentityjson"><c- n>PublicKeyCredentialUserEntityJSON</c-></a>              <a data-type="PublicKeyCredentialUserEntityJSON              " href="#dom-publickeycredentialcreationoptionsjson-user"><code><c- g>user</c-></code></a>;
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a>                                <a data-type="Base64URLString                                " href="#dom-publickeycredentialcreationoptionsjson-challenge"><code><c- g>challenge</c-></code></a>;
+    <c- b>required</c-> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialparameters"><c- n>PublicKeyCredentialParameters</c-></a>>        <a data-type="sequence<PublicKeyCredentialParameters>        " href="#dom-publickeycredentialcreationoptionsjson-pubkeycredparams"><code><c- g>pubKeyCredParams</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long"><c- b>unsigned</c-> <c- b>long</c-></a>                                           <a data-type="unsigned long                                           " href="#dom-publickeycredentialcreationoptionsjson-timeout"><code><c- g>timeout</c-></code></a>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptorjson"><c- n>PublicKeyCredentialDescriptorJSON</c-></a>>             <a data-default="[]" data-type="sequence<PublicKeyCredentialDescriptorJSON>             " href="#dom-publickeycredentialcreationoptionsjson-excludecredentials"><code><c- g>excludeCredentials</c-></code></a> = [];
+    <a data-link-type="idl-name" href="#dictdef-authenticatorselectioncriteria"><c- n>AuthenticatorSelectionCriteria</c-></a>                          <a data-type="AuthenticatorSelectionCriteria                          " href="#dom-publickeycredentialcreationoptionsjson-authenticatorselection"><code><c- g>authenticatorSelection</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>                                               <a data-default="&quot;none&quot;" data-type="DOMString                                               " href="#dom-publickeycredentialcreationoptionsjson-attestation"><code><c- g>attestation</c-></code></a> = "none";
+    <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputsjson"><c- n>AuthenticationExtensionsClientInputsJSON</c-></a>                <a data-type="AuthenticationExtensionsClientInputsJSON                " href="#dom-publickeycredentialcreationoptionsjson-extensions"><code><c- g>extensions</c-></code></a>;
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-publickeycredentialuserentityjson"><code><c- g>PublicKeyCredentialUserEntityJSON</c-></code></a> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a>        <a data-type="Base64URLString        " href="#dom-publickeycredentialuserentityjson-id"><code><c- g>id</c-></code></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>              <a data-type="DOMString              " href="#dom-publickeycredentialuserentityjson-name"><code><c- g>name</c-></code></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>              <a data-type="DOMString              " href="#dom-publickeycredentialuserentityjson-displayname"><code><c- g>displayName</c-></code></a>;
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-publickeycredentialdescriptorjson"><code><c- g>PublicKeyCredentialDescriptorJSON</c-></code></a> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a>        <a data-type="Base64URLString        " href="#dom-publickeycredentialdescriptorjson-id"><code><c- g>id</c-></code></a>;
+    <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>              <a data-type="DOMString              " href="#dom-publickeycredentialdescriptorjson-type"><code><c- g>type</c-></code></a>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence"><c- b>sequence</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>>             <a data-type="sequence<DOMString>             " href="#dom-publickeycredentialdescriptorjson-transports"><code><c- g>transports</c-></code></a>;
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-authenticationextensionsclientinputsjson"><code><c- g>AuthenticationExtensionsClientInputsJSON</c-></code></a> {
+};
+
+<c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#publickeycredential"><c- g>PublicKeyCredential</c-></a> {
+    <c- b>static</c-> <a data-link-type="idl-name" href="#dictdef-publickeycredentialrequestoptions"><c- n>PublicKeyCredentialRequestOptions</c-></a> <a href="#dom-publickeycredential-parserequestoptionsfromjson"><code><c- g>parseRequestOptionsFromJSON</c-></code></a>(<a data-link-type="idl-name" href="#dictdef-publickeycredentialrequestoptionsjson"><c- n>PublicKeyCredentialRequestOptionsJSON</c-></a> <a href="#dom-publickeycredential-parserequestoptionsfromjson-options-options"><code><c- g>options</c-></code></a>);
+};
+
+<c- b>dictionary</c-> <a href="#dictdef-publickeycredentialrequestoptionsjson"><code><c- g>PublicKeyCredentialRequestOptionsJSON</c-></code></a> {
+    <c- b>required</c-> <a data-link-type="idl-name" href="#typedefdef-base64urlstring"><c- n>Base64URLString</c-></a>                                <a data-type="Base64URLString                                " href="#dom-publickeycredentialrequestoptionsjson-challenge"><code><c- g>challenge</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long"><c- b>unsigned</c-> <c- b>long</c-></a>                                           <a data-type="unsigned long                                           " href="#dom-publickeycredentialrequestoptionsjson-timeout"><code><c- g>timeout</c-></code></a>;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>                                               <a data-type="DOMString                                               " href="#dom-publickeycredentialrequestoptionsjson-rpid"><code><c- g>rpId</c-></code></a>;
+    <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-publickeycredentialdescriptorjson"><c- n>PublicKeyCredentialDescriptorJSON</c-></a>>             <a data-default="[]" data-type="sequence<PublicKeyCredentialDescriptorJSON>             " href="#dom-publickeycredentialrequestoptionsjson-allowcredentials"><code><c- g>allowCredentials</c-></code></a> = [];
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>                                               <a data-default="&quot;preferred&quot;" data-type="DOMString                                               " href="#dom-publickeycredentialrequestoptionsjson-userverification"><code><c- g>userVerification</c-></code></a> = "preferred";
+    <a data-link-type="idl-name" href="#dictdef-authenticationextensionsclientinputsjson"><c- n>AuthenticationExtensionsClientInputsJSON</c-></a>                <a data-type="AuthenticationExtensionsClientInputsJSON                " href="#dom-publickeycredentialrequestoptionsjson-extensions"><code><c- g>extensions</c-></code></a>;
+};
+
 [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SecureContext"><c- g>SecureContext</c-></a>, <a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed"><c- g>Exposed</c-></a>=<c- n>Window</c->]
 <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#authenticatorresponse"><c- g>AuthenticatorResponse</c-></a> {
     [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#SameObject"><c- g>SameObject</c-></a>] <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-ArrayBuffer"><c- b>ArrayBuffer</c-></a>      <a class="idl-code" data-link-type="attribute" data-readonly data-type="ArrayBuffer" href="#dom-authenticatorresponse-clientdatajson"><c- g>clientDataJSON</c-></a>;
@@ -9321,7 +9678,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
     <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-type"><c- g>type</c-></a>;
     <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-challenge"><c- g>challenge</c-></a>;
     <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString"><c- b>DOMString</c-></a>           <a class="idl-code" data-link-type="dict-member" data-type="DOMString           " href="#dom-collectedclientdata-origin"><c- g>origin</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a>                      <a class="idl-code" data-link-type="dict-member" data-type="boolean                      " href="#dom-collectedclientdata-crossorigin"><c- g>crossOrigin</c-></a>;        
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a>                      <a class="idl-code" data-link-type="dict-member" data-type="boolean                      " href="#dom-collectedclientdata-crossorigin"><c- g>crossOrigin</c-></a>;
 };
 
 <c- b>dictionary</c-> <a href="#dictdef-tokenbinding"><code><c- g>TokenBinding</c-></code></a> {
@@ -9430,16 +9787,18 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
   <aside class="dfn-panel" data-for="base64url-encoding">
    <b><a href="#base64url-encoding">#base64url-encoding</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-base64url-encoding">5.1. PublicKeyCredential Interface</a>
-    <li><a href="#ref-for-base64url-encoding①">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-base64url-encoding②">(2)</a>
-    <li><a href="#ref-for-base64url-encoding③">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-base64url-encoding④">(2)</a>
-    <li><a href="#ref-for-base64url-encoding⑤">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a>
-    <li><a href="#ref-for-base64url-encoding⑥">5.8.1.1. Serialization</a>
-    <li><a href="#ref-for-base64url-encoding⑦">5.8.1.2. Limited Verification Algorithm</a>
-    <li><a href="#ref-for-base64url-encoding⑧">7.2. Verifying an Authentication Assertion</a>
-    <li><a href="#ref-for-base64url-encoding⑨">10.1. FIDO AppID Extension (appid)</a>
-    <li><a href="#ref-for-base64url-encoding①⓪">10.2. FIDO AppID Exclusion Extension (appidExclude)</a>
-    <li><a href="#ref-for-base64url-encoding①①">11.5. Add Credential</a> <a href="#ref-for-base64url-encoding①②">(2)</a> <a href="#ref-for-base64url-encoding①③">(3)</a> <a href="#ref-for-base64url-encoding①④">(4)</a> <a href="#ref-for-base64url-encoding①⑤">(5)</a> <a href="#ref-for-base64url-encoding①⑥">(6)</a> <a href="#ref-for-base64url-encoding①⑦">(7)</a> <a href="#ref-for-base64url-encoding①⑧">(8)</a>
+    <li><a href="#ref-for-base64url-encoding">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-base64url-encoding①">(2)</a> <a href="#ref-for-base64url-encoding②">(3)</a>
+    <li><a href="#ref-for-base64url-encoding③">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-base64url-encoding④">(2)</a>
+    <li><a href="#ref-for-base64url-encoding⑤">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-base64url-encoding⑥">(2)</a>
+    <li><a href="#ref-for-base64url-encoding⑦">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-base64url-encoding⑧">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+    <li><a href="#ref-for-base64url-encoding⑨">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a>
+    <li><a href="#ref-for-base64url-encoding①⓪">5.8.1.1. Serialization</a>
+    <li><a href="#ref-for-base64url-encoding①①">5.8.1.2. Limited Verification Algorithm</a>
+    <li><a href="#ref-for-base64url-encoding①②">7.2. Verifying an Authentication Assertion</a>
+    <li><a href="#ref-for-base64url-encoding①③">10.1. FIDO AppID Extension (appid)</a>
+    <li><a href="#ref-for-base64url-encoding①④">10.2. FIDO AppID Exclusion Extension (appidExclude)</a>
+    <li><a href="#ref-for-base64url-encoding①⑤">11.5. Add Credential</a> <a href="#ref-for-base64url-encoding①⑥">(2)</a> <a href="#ref-for-base64url-encoding①⑦">(3)</a> <a href="#ref-for-base64url-encoding①⑧">(4)</a> <a href="#ref-for-base64url-encoding①⑨">(5)</a> <a href="#ref-for-base64url-encoding②⓪">(6)</a> <a href="#ref-for-base64url-encoding②①">(7)</a> <a href="#ref-for-base64url-encoding②②">(8)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="cbor">
@@ -9809,42 +10168,45 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
     <li><a href="#ref-for-client①">1.3.1. Registration</a> <a href="#ref-for-client②">(2)</a>
     <li><a href="#ref-for-client③">1.3.3. Authentication</a> <a href="#ref-for-client④">(2)</a> <a href="#ref-for-client⑤">(3)</a>
     <li><a href="#ref-for-client⑥">4. Terminology</a> <a href="#ref-for-client⑦">(2)</a> <a href="#ref-for-client⑧">(3)</a> <a href="#ref-for-client⑨">(4)</a> <a href="#ref-for-client①⓪">(5)</a> <a href="#ref-for-client①①">(6)</a> <a href="#ref-for-client①②">(7)</a> <a href="#ref-for-client①③">(8)</a> <a href="#ref-for-client①④">(9)</a>
-    <li><a href="#ref-for-client①⑤">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-client①⑥">(2)</a> <a href="#ref-for-client①⑦">(3)</a> <a href="#ref-for-client①⑧">(4)</a> <a href="#ref-for-client①⑨">(5)</a>
-    <li><a href="#ref-for-client②⓪">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-client②①">(2)</a> <a href="#ref-for-client②②">(3)</a> <a href="#ref-for-client②③">(4)</a>
-    <li><a href="#ref-for-client②④">5.1.7. Availability of User-Verifying Platform Authenticator - PublicKeyCredential’s isUserVerifyingPlatformAuthenticatorAvailable() Method</a>
-    <li><a href="#ref-for-client②⑤">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-client②⑥">(2)</a> <a href="#ref-for-client②⑦">(3)</a> <a href="#ref-for-client②⑧">(4)</a> <a href="#ref-for-client②⑨">(5)</a>
-    <li><a href="#ref-for-client③⓪">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> <a href="#ref-for-client③①">(2)</a> <a href="#ref-for-client③②">(3)</a>
-    <li><a href="#ref-for-client③③">5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)</a> <a href="#ref-for-client③④">(2)</a>
-    <li><a href="#ref-for-client③⑤">5.4.5. Authenticator Attachment Enumeration (enum AuthenticatorAttachment)</a> <a href="#ref-for-client③⑥">(2)</a>
-    <li><a href="#ref-for-client③⑦">5.4.6. Resident Key Requirement Enumeration (enum ResidentKeyRequirement)</a> <a href="#ref-for-client③⑧">(2)</a> <a href="#ref-for-client③⑨">(3)</a> <a href="#ref-for-client④⓪">(4)</a>
-    <li><a href="#ref-for-client④①">5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a> <a href="#ref-for-client④②">(2)</a> <a href="#ref-for-client④③">(3)</a>
-    <li><a href="#ref-for-client④④">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-client④⑤">(2)</a> <a href="#ref-for-client④⑥">(3)</a> <a href="#ref-for-client④⑦">(4)</a> <a href="#ref-for-client④⑧">(5)</a> <a href="#ref-for-client④⑨">(6)</a>
-    <li><a href="#ref-for-client⑤⓪">5.7.3. Authentication Extensions Authenticator Inputs (CDDL type AuthenticationExtensionsAuthenticatorInputs)</a>
-    <li><a href="#ref-for-client⑤①">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a>
-    <li><a href="#ref-for-client⑤②">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-client⑤③">(2)</a>
-    <li><a href="#ref-for-client⑤④">5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>
-    <li><a href="#ref-for-client⑤⑤">5.8.6. User Verification Requirement Enumeration (enum UserVerificationRequirement)</a>
-    <li><a href="#ref-for-client⑤⑥">6. WebAuthn Authenticator Model</a> <a href="#ref-for-client⑤⑦">(2)</a>
-    <li><a href="#ref-for-client⑤⑧">6.1. Authenticator Data</a> <a href="#ref-for-client⑤⑨">(2)</a>
-    <li><a href="#ref-for-client⑥⓪">6.2. Authenticator Taxonomy</a>
-    <li><a href="#ref-for-client⑥①">6.2.1. Authenticator Attachment Modality</a> <a href="#ref-for-client⑥②">(2)</a> <a href="#ref-for-client⑥③">(3)</a> <a href="#ref-for-client⑥④">(4)</a> <a href="#ref-for-client⑥⑤">(5)</a>
-    <li><a href="#ref-for-client⑥⑥">6.2.2. Credential Storage Modality</a>
-    <li><a href="#ref-for-client⑥⑦">6.3.2. The authenticatorMakeCredential Operation</a> <a href="#ref-for-client⑥⑧">(2)</a> <a href="#ref-for-client⑥⑨">(3)</a> <a href="#ref-for-client⑦⓪">(4)</a>
-    <li><a href="#ref-for-client⑦①">7.1. Registering a New Credential</a> <a href="#ref-for-client⑦②">(2)</a>
-    <li><a href="#ref-for-client⑦③">7.2. Verifying an Authentication Assertion</a>
-    <li><a href="#ref-for-client⑦④">8.6. FIDO U2F Attestation Statement Format</a>
-    <li><a href="#ref-for-client⑦⑤">9. WebAuthn Extensions</a> <a href="#ref-for-client⑦⑥">(2)</a>
-    <li><a href="#ref-for-client⑦⑦">9.4. Client Extension Processing</a>
-    <li><a href="#ref-for-client⑦⑧">10.4. Credential Properties Extension (credProps)</a>
-    <li><a href="#ref-for-client⑦⑨">12.4. WebAuthn Extension Identifier Registrations</a>
-    <li><a href="#ref-for-client⑧⓪">13. Security Considerations</a>
-    <li><a href="#ref-for-client⑧①">13.2. Physical Proximity between Client and Authenticator</a> <a href="#ref-for-client⑧②">(2)</a> <a href="#ref-for-client⑧③">(3)</a> <a href="#ref-for-client⑧④">(4)</a> <a href="#ref-for-client⑧⑤">(5)</a> <a href="#ref-for-client⑧⑥">(6)</a> <a href="#ref-for-client⑧⑦">(7)</a> <a href="#ref-for-client⑧⑧">(8)</a>
-    <li><a href="#ref-for-client⑧⑨">14. Privacy Considerations</a>
-    <li><a href="#ref-for-client⑨⓪">14.1. De-anonymization Prevention Measures</a> <a href="#ref-for-client⑨①">(2)</a> <a href="#ref-for-client⑨②">(3)</a> <a href="#ref-for-client⑨③">(4)</a> <a href="#ref-for-client⑨④">(5)</a>
-    <li><a href="#ref-for-client⑨⑤">14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials</a> <a href="#ref-for-client⑨⑥">(2)</a> <a href="#ref-for-client⑨⑦">(3)</a>
-    <li><a href="#ref-for-client⑨⑧">14.3. Authenticator-local Biometric Recognition</a>
-    <li><a href="#ref-for-client⑨⑨">14.4.2. Privacy of personally identifying information Stored in Authenticators</a> <a href="#ref-for-client①⓪⓪">(2)</a>
-    <li><a href="#ref-for-client①⓪①">14.5. Privacy considerations for clients</a>
+    <li><a href="#ref-for-client①⑤">5.1. PublicKeyCredential Interface</a>
+    <li><a href="#ref-for-client①⑥">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-client①⑦">(2)</a> <a href="#ref-for-client①⑧">(3)</a> <a href="#ref-for-client①⑨">(4)</a> <a href="#ref-for-client②⓪">(5)</a>
+    <li><a href="#ref-for-client②①">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-client②②">(2)</a> <a href="#ref-for-client②③">(3)</a> <a href="#ref-for-client②④">(4)</a>
+    <li><a href="#ref-for-client②⑤">5.1.7. Availability of User-Verifying Platform Authenticator - PublicKeyCredential’s isUserVerifyingPlatformAuthenticatorAvailable() Method</a>
+    <li><a href="#ref-for-client②⑥">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a> <a href="#ref-for-client②⑦">(2)</a> <a href="#ref-for-client②⑧">(3)</a>
+    <li><a href="#ref-for-client②⑨">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a> <a href="#ref-for-client③⓪">(2)</a> <a href="#ref-for-client③①">(3)</a>
+    <li><a href="#ref-for-client③②">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-client③③">(2)</a> <a href="#ref-for-client③④">(3)</a> <a href="#ref-for-client③⑤">(4)</a> <a href="#ref-for-client③⑥">(5)</a>
+    <li><a href="#ref-for-client③⑦">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> <a href="#ref-for-client③⑧">(2)</a> <a href="#ref-for-client③⑨">(3)</a>
+    <li><a href="#ref-for-client④⓪">5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)</a> <a href="#ref-for-client④①">(2)</a>
+    <li><a href="#ref-for-client④②">5.4.5. Authenticator Attachment Enumeration (enum AuthenticatorAttachment)</a> <a href="#ref-for-client④③">(2)</a>
+    <li><a href="#ref-for-client④④">5.4.6. Resident Key Requirement Enumeration (enum ResidentKeyRequirement)</a> <a href="#ref-for-client④⑤">(2)</a> <a href="#ref-for-client④⑥">(3)</a> <a href="#ref-for-client④⑦">(4)</a>
+    <li><a href="#ref-for-client④⑧">5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a> <a href="#ref-for-client④⑨">(2)</a> <a href="#ref-for-client⑤⓪">(3)</a>
+    <li><a href="#ref-for-client⑤①">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-client⑤②">(2)</a> <a href="#ref-for-client⑤③">(3)</a> <a href="#ref-for-client⑤④">(4)</a> <a href="#ref-for-client⑤⑤">(5)</a> <a href="#ref-for-client⑤⑥">(6)</a>
+    <li><a href="#ref-for-client⑤⑦">5.7.3. Authentication Extensions Authenticator Inputs (CDDL type AuthenticationExtensionsAuthenticatorInputs)</a>
+    <li><a href="#ref-for-client⑤⑧">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a>
+    <li><a href="#ref-for-client⑤⑨">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-client⑥⓪">(2)</a>
+    <li><a href="#ref-for-client⑥①">5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>
+    <li><a href="#ref-for-client⑥②">5.8.6. User Verification Requirement Enumeration (enum UserVerificationRequirement)</a>
+    <li><a href="#ref-for-client⑥③">6. WebAuthn Authenticator Model</a> <a href="#ref-for-client⑥④">(2)</a>
+    <li><a href="#ref-for-client⑥⑤">6.1. Authenticator Data</a> <a href="#ref-for-client⑥⑥">(2)</a>
+    <li><a href="#ref-for-client⑥⑦">6.2. Authenticator Taxonomy</a>
+    <li><a href="#ref-for-client⑥⑧">6.2.1. Authenticator Attachment Modality</a> <a href="#ref-for-client⑥⑨">(2)</a> <a href="#ref-for-client⑦⓪">(3)</a> <a href="#ref-for-client⑦①">(4)</a> <a href="#ref-for-client⑦②">(5)</a>
+    <li><a href="#ref-for-client⑦③">6.2.2. Credential Storage Modality</a>
+    <li><a href="#ref-for-client⑦④">6.3.2. The authenticatorMakeCredential Operation</a> <a href="#ref-for-client⑦⑤">(2)</a> <a href="#ref-for-client⑦⑥">(3)</a> <a href="#ref-for-client⑦⑦">(4)</a>
+    <li><a href="#ref-for-client⑦⑧">7.1. Registering a New Credential</a> <a href="#ref-for-client⑦⑨">(2)</a>
+    <li><a href="#ref-for-client⑧⓪">7.2. Verifying an Authentication Assertion</a>
+    <li><a href="#ref-for-client⑧①">8.6. FIDO U2F Attestation Statement Format</a>
+    <li><a href="#ref-for-client⑧②">9. WebAuthn Extensions</a> <a href="#ref-for-client⑧③">(2)</a>
+    <li><a href="#ref-for-client⑧④">9.4. Client Extension Processing</a>
+    <li><a href="#ref-for-client⑧⑤">10.4. Credential Properties Extension (credProps)</a>
+    <li><a href="#ref-for-client⑧⑥">12.4. WebAuthn Extension Identifier Registrations</a>
+    <li><a href="#ref-for-client⑧⑦">13. Security Considerations</a>
+    <li><a href="#ref-for-client⑧⑧">13.2. Physical Proximity between Client and Authenticator</a> <a href="#ref-for-client⑧⑨">(2)</a> <a href="#ref-for-client⑨⓪">(3)</a> <a href="#ref-for-client⑨①">(4)</a> <a href="#ref-for-client⑨②">(5)</a> <a href="#ref-for-client⑨③">(6)</a> <a href="#ref-for-client⑨④">(7)</a> <a href="#ref-for-client⑨⑤">(8)</a>
+    <li><a href="#ref-for-client⑨⑥">14. Privacy Considerations</a>
+    <li><a href="#ref-for-client⑨⑦">14.1. De-anonymization Prevention Measures</a> <a href="#ref-for-client⑨⑧">(2)</a> <a href="#ref-for-client⑨⑨">(3)</a> <a href="#ref-for-client①⓪⓪">(4)</a> <a href="#ref-for-client①⓪①">(5)</a>
+    <li><a href="#ref-for-client①⓪②">14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials</a> <a href="#ref-for-client①⓪③">(2)</a> <a href="#ref-for-client①⓪④">(3)</a>
+    <li><a href="#ref-for-client①⓪⑤">14.3. Authenticator-local Biometric Recognition</a>
+    <li><a href="#ref-for-client①⓪⑥">14.4.2. Privacy of personally identifying information Stored in Authenticators</a> <a href="#ref-for-client①⓪⑦">(2)</a>
+    <li><a href="#ref-for-client①⓪⑧">14.5. Privacy considerations for clients</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="webauthn-client">
@@ -10265,76 +10627,76 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
     <li><a href="#ref-for-relying-party③②">2.1.1. Enumerations as DOMString types</a>
     <li><a href="#ref-for-relying-party③③">4. Terminology</a> <a href="#ref-for-relying-party③④">(2)</a> <a href="#ref-for-relying-party③⑤">(3)</a> <a href="#ref-for-relying-party③⑥">(4)</a> <a href="#ref-for-relying-party③⑦">(5)</a> <a href="#ref-for-relying-party③⑧">(6)</a> <a href="#ref-for-relying-party③⑨">(7)</a> <a href="#ref-for-relying-party④⓪">(8)</a> <a href="#ref-for-relying-party④①">(9)</a> <a href="#ref-for-relying-party④②">(10)</a> <a href="#ref-for-relying-party④③">(11)</a> <a href="#ref-for-relying-party④④">(12)</a> <a href="#ref-for-relying-party④⑤">(13)</a> <a href="#ref-for-relying-party④⑥">(14)</a> <a href="#ref-for-relying-party④⑦">(15)</a> <a href="#ref-for-relying-party④⑧">(16)</a> <a href="#ref-for-relying-party④⑨">(17)</a> <a href="#ref-for-relying-party⑤⓪">(18)</a> <a href="#ref-for-relying-party⑤①">(19)</a> <a href="#ref-for-relying-party⑤②">(20)</a> <a href="#ref-for-relying-party⑤③">(21)</a> <a href="#ref-for-relying-party⑤④">(22)</a> <a href="#ref-for-relying-party⑤⑤">(23)</a> <a href="#ref-for-relying-party⑤⑥">(24)</a> <a href="#ref-for-relying-party⑤⑦">(25)</a> <a href="#ref-for-relying-party⑤⑧">(26)</a> <a href="#ref-for-relying-party⑤⑨">(27)</a> <a href="#ref-for-relying-party⑥⓪">(28)</a> <a href="#ref-for-relying-party⑥①">(29)</a> <a href="#ref-for-relying-party⑥②">(30)</a> <a href="#ref-for-relying-party⑥③">(31)</a> <a href="#ref-for-relying-party⑥④">(32)</a> <a href="#ref-for-relying-party⑥⑤">(33)</a> <a href="#ref-for-relying-party⑥⑥">(34)</a> <a href="#ref-for-relying-party⑥⑦">(35)</a> <a href="#ref-for-relying-party⑥⑧">(36)</a> <a href="#ref-for-relying-party⑥⑨">(37)</a> <a href="#ref-for-relying-party⑦⓪">(38)</a> <a href="#ref-for-relying-party⑦①">(39)</a>
     <li><a href="#ref-for-relying-party⑦②">5. Web Authentication API</a> <a href="#ref-for-relying-party⑦③">(2)</a> <a href="#ref-for-relying-party⑦④">(3)</a> <a href="#ref-for-relying-party⑦⑤">(4)</a> <a href="#ref-for-relying-party⑦⑥">(5)</a> <a href="#ref-for-relying-party⑦⑦">(6)</a> <a href="#ref-for-relying-party⑦⑧">(7)</a>
-    <li><a href="#ref-for-relying-party⑦⑨">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-relying-party⑧⓪">(2)</a> <a href="#ref-for-relying-party⑧①">(3)</a> <a href="#ref-for-relying-party⑧②">(4)</a>
-    <li><a href="#ref-for-relying-party⑧③">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-relying-party⑧④">(2)</a> <a href="#ref-for-relying-party⑧⑤">(3)</a> <a href="#ref-for-relying-party⑧⑥">(4)</a>
-    <li><a href="#ref-for-relying-party⑧⑦">5.1.4. Use an Existing Credential to Make an Assertion - PublicKeyCredential’s [[Get]](options) Method</a> <a href="#ref-for-relying-party⑧⑧">(2)</a>
-    <li><a href="#ref-for-relying-party⑧⑨">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-relying-party⑨⓪">(2)</a>
-    <li><a href="#ref-for-relying-party⑨①">5.1.7. Availability of User-Verifying Platform Authenticator - PublicKeyCredential’s isUserVerifyingPlatformAuthenticatorAvailable() Method</a>
-    <li><a href="#ref-for-relying-party⑨②">5.2. Authenticator Responses (interface AuthenticatorResponse)</a>
-    <li><a href="#ref-for-relying-party⑨③">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a> <a href="#ref-for-relying-party⑨④">(2)</a>
-    <li><a href="#ref-for-relying-party⑨⑤">5.2.1.1. Easily accessing credential data</a> <a href="#ref-for-relying-party⑨⑥">(2)</a> <a href="#ref-for-relying-party⑨⑦">(3)</a> <a href="#ref-for-relying-party⑨⑧">(4)</a> <a href="#ref-for-relying-party⑨⑨">(5)</a> <a href="#ref-for-relying-party①⓪⓪">(6)</a> <a href="#ref-for-relying-party①⓪①">(7)</a>
-    <li><a href="#ref-for-relying-party①⓪②">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-relying-party①⓪③">(2)</a> <a href="#ref-for-relying-party①⓪④">(3)</a> <a href="#ref-for-relying-party①⓪⑤">(4)</a> <a href="#ref-for-relying-party①⓪⑥">(5)</a> <a href="#ref-for-relying-party①⓪⑦">(6)</a> <a href="#ref-for-relying-party①⓪⑧">(7)</a> <a href="#ref-for-relying-party①⓪⑨">(8)</a> <a href="#ref-for-relying-party①①⓪">(9)</a>
-    <li><a href="#ref-for-relying-party①①①">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> <a href="#ref-for-relying-party①①②">(2)</a> <a href="#ref-for-relying-party①①③">(3)</a> <a href="#ref-for-relying-party①①④">(4)</a> <a href="#ref-for-relying-party①①⑤">(5)</a> <a href="#ref-for-relying-party①①⑥">(6)</a>
-    <li><a href="#ref-for-relying-party①①⑦">5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)</a> <a href="#ref-for-relying-party①①⑧">(2)</a>
-    <li><a href="#ref-for-relying-party①①⑨">5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)</a> <a href="#ref-for-relying-party①②⓪">(2)</a> <a href="#ref-for-relying-party①②①">(3)</a> <a href="#ref-for-relying-party①②②">(4)</a>
-    <li><a href="#ref-for-relying-party①②③">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a> <a href="#ref-for-relying-party①②④">(2)</a> <a href="#ref-for-relying-party①②⑤">(3)</a>
-    <li><a href="#ref-for-relying-party①②⑥">5.4.5. Authenticator Attachment Enumeration (enum AuthenticatorAttachment)</a> <a href="#ref-for-relying-party①②⑦">(2)</a> <a href="#ref-for-relying-party①②⑧">(3)</a>
-    <li><a href="#ref-for-relying-party①②⑨">5.4.6. Resident Key Requirement Enumeration (enum ResidentKeyRequirement)</a> <a href="#ref-for-relying-party①③⓪">(2)</a> <a href="#ref-for-relying-party①③①">(3)</a> <a href="#ref-for-relying-party①③②">(4)</a> <a href="#ref-for-relying-party①③③">(5)</a> <a href="#ref-for-relying-party①③④">(6)</a>
-    <li><a href="#ref-for-relying-party①③⑤">5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a> <a href="#ref-for-relying-party①③⑥">(2)</a> <a href="#ref-for-relying-party①③⑦">(3)</a> <a href="#ref-for-relying-party①③⑧">(4)</a> <a href="#ref-for-relying-party①③⑨">(5)</a> <a href="#ref-for-relying-party①④⓪">(6)</a> <a href="#ref-for-relying-party①④①">(7)</a> <a href="#ref-for-relying-party①④②">(8)</a>
-    <li><a href="#ref-for-relying-party①④③">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-relying-party①④④">(2)</a> <a href="#ref-for-relying-party①④⑤">(3)</a> <a href="#ref-for-relying-party①④⑥">(4)</a> <a href="#ref-for-relying-party①④⑦">(5)</a> <a href="#ref-for-relying-party①④⑧">(6)</a> <a href="#ref-for-relying-party①④⑨">(7)</a> <a href="#ref-for-relying-party①⑤⓪">(8)</a> <a href="#ref-for-relying-party①⑤①">(9)</a>
-    <li><a href="#ref-for-relying-party①⑤②">5.7.3. Authentication Extensions Authenticator Inputs (CDDL type AuthenticationExtensionsAuthenticatorInputs)</a>
-    <li><a href="#ref-for-relying-party①⑤③">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a> <a href="#ref-for-relying-party①⑤④">(2)</a> <a href="#ref-for-relying-party①⑤⑤">(3)</a> <a href="#ref-for-relying-party①⑤⑥">(4)</a> <a href="#ref-for-relying-party①⑤⑦">(5)</a>
-    <li><a href="#ref-for-relying-party①⑤⑧">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-relying-party①⑤⑨">(2)</a>
-    <li><a href="#ref-for-relying-party①⑥⓪">5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>
-    <li><a href="#ref-for-relying-party①⑥①">5.8.6. User Verification Requirement Enumeration (enum UserVerificationRequirement)</a> <a href="#ref-for-relying-party①⑥②">(2)</a> <a href="#ref-for-relying-party①⑥③">(3)</a>
-    <li><a href="#ref-for-relying-party①⑥④">5.10. Using Web Authentication within iframe elements</a>
-    <li><a href="#ref-for-relying-party①⑥⑤">6. WebAuthn Authenticator Model</a> <a href="#ref-for-relying-party①⑥⑥">(2)</a> <a href="#ref-for-relying-party①⑥⑦">(3)</a> <a href="#ref-for-relying-party①⑥⑧">(4)</a>
-    <li><a href="#ref-for-relying-party①⑥⑨">6.1. Authenticator Data</a>
-    <li><a href="#ref-for-relying-party①⑦⓪">6.1.1. Signature Counter Considerations</a> <a href="#ref-for-relying-party①⑦①">(2)</a> <a href="#ref-for-relying-party①⑦②">(3)</a> <a href="#ref-for-relying-party①⑦③">(4)</a> <a href="#ref-for-relying-party①⑦④">(5)</a>
-    <li><a href="#ref-for-relying-party①⑦⑤">6.1.3. Credential Backup State</a> <a href="#ref-for-relying-party①⑦⑥">(2)</a> <a href="#ref-for-relying-party①⑦⑦">(3)</a> <a href="#ref-for-relying-party①⑦⑧">(4)</a> <a href="#ref-for-relying-party①⑦⑨">(5)</a>
-    <li><a href="#ref-for-relying-party①⑧⓪">6.2. Authenticator Taxonomy</a>
-    <li><a href="#ref-for-relying-party①⑧①">6.2.2. Credential Storage Modality</a> <a href="#ref-for-relying-party①⑧②">(2)</a> <a href="#ref-for-relying-party①⑧③">(3)</a>
-    <li><a href="#ref-for-relying-party①⑧④">6.2.3. Authentication Factor Capability</a> <a href="#ref-for-relying-party①⑧⑤">(2)</a> <a href="#ref-for-relying-party①⑧⑥">(3)</a>
-    <li><a href="#ref-for-relying-party①⑧⑦">6.3.2. The authenticatorMakeCredential Operation</a> <a href="#ref-for-relying-party①⑧⑧">(2)</a> <a href="#ref-for-relying-party①⑧⑨">(3)</a> <a href="#ref-for-relying-party①⑨⓪">(4)</a> <a href="#ref-for-relying-party①⑨①">(5)</a> <a href="#ref-for-relying-party①⑨②">(6)</a>
-    <li><a href="#ref-for-relying-party①⑨③">6.3.3. The authenticatorGetAssertion Operation</a> <a href="#ref-for-relying-party①⑨④">(2)</a> <a href="#ref-for-relying-party①⑨⑤">(3)</a>
-    <li><a href="#ref-for-relying-party①⑨⑥">6.4. String Handling</a>
-    <li><a href="#ref-for-relying-party①⑨⑦">6.4.1. String Truncation</a> <a href="#ref-for-relying-party①⑨⑧">(2)</a>
-    <li><a href="#ref-for-relying-party①⑨⑨">6.5. Attestation</a> <a href="#ref-for-relying-party②⓪⓪">(2)</a> <a href="#ref-for-relying-party②⓪①">(3)</a> <a href="#ref-for-relying-party②⓪②">(4)</a> <a href="#ref-for-relying-party②⓪③">(5)</a> <a href="#ref-for-relying-party②⓪④">(6)</a> <a href="#ref-for-relying-party②⓪⑤">(7)</a> <a href="#ref-for-relying-party②⓪⑥">(8)</a>
-    <li><a href="#ref-for-relying-party②⓪⑦">6.5.3. Attestation Types</a> <a href="#ref-for-relying-party②⓪⑧">(2)</a> <a href="#ref-for-relying-party②⓪⑨">(3)</a> <a href="#ref-for-relying-party②①⓪">(4)</a> <a href="#ref-for-relying-party②①①">(5)</a>
-    <li><a href="#ref-for-relying-party②①②">7. WebAuthn Relying Party Operations</a> <a href="#ref-for-relying-party②①③">(2)</a> <a href="#ref-for-relying-party②①④">(3)</a> <a href="#ref-for-relying-party②①⑤">(4)</a>
-    <li><a href="#ref-for-relying-party②①⑥">7.1. Registering a New Credential</a> <a href="#ref-for-relying-party②①⑦">(2)</a> <a href="#ref-for-relying-party②①⑧">(3)</a> <a href="#ref-for-relying-party②①⑨">(4)</a> <a href="#ref-for-relying-party②②⓪">(5)</a> <a href="#ref-for-relying-party②②①">(6)</a> <a href="#ref-for-relying-party②②②">(7)</a> <a href="#ref-for-relying-party②②③">(8)</a> <a href="#ref-for-relying-party②②④">(9)</a> <a href="#ref-for-relying-party②②⑤">(10)</a> <a href="#ref-for-relying-party②②⑥">(11)</a> <a href="#ref-for-relying-party②②⑦">(12)</a> <a href="#ref-for-relying-party②②⑧">(13)</a> <a href="#ref-for-relying-party②②⑨">(14)</a> <a href="#ref-for-relying-party②③⓪">(15)</a> <a href="#ref-for-relying-party②③①">(16)</a> <a href="#ref-for-relying-party②③②">(17)</a> <a href="#ref-for-relying-party②③③">(18)</a> <a href="#ref-for-relying-party②③④">(19)</a> <a href="#ref-for-relying-party②③⑤">(20)</a> <a href="#ref-for-relying-party②③⑥">(21)</a> <a href="#ref-for-relying-party②③⑦">(22)</a> <a href="#ref-for-relying-party②③⑧">(23)</a> <a href="#ref-for-relying-party②③⑨">(24)</a>
-    <li><a href="#ref-for-relying-party②④⓪">7.2. Verifying an Authentication Assertion</a> <a href="#ref-for-relying-party②④①">(2)</a> <a href="#ref-for-relying-party②④②">(3)</a> <a href="#ref-for-relying-party②④③">(4)</a> <a href="#ref-for-relying-party②④④">(5)</a> <a href="#ref-for-relying-party②④⑤">(6)</a> <a href="#ref-for-relying-party②④⑥">(7)</a> <a href="#ref-for-relying-party②④⑦">(8)</a> <a href="#ref-for-relying-party②④⑧">(9)</a> <a href="#ref-for-relying-party②④⑨">(10)</a> <a href="#ref-for-relying-party②⑤⓪">(11)</a> <a href="#ref-for-relying-party②⑤①">(12)</a> <a href="#ref-for-relying-party②⑤②">(13)</a>
-    <li><a href="#ref-for-relying-party②⑤③">9. WebAuthn Extensions</a> <a href="#ref-for-relying-party②⑤④">(2)</a> <a href="#ref-for-relying-party②⑤⑤">(3)</a>
-    <li><a href="#ref-for-relying-party②⑤⑥">9.2. Defining Extensions</a>
-    <li><a href="#ref-for-relying-party②⑤⑦">9.3. Extending Request Parameters</a> <a href="#ref-for-relying-party②⑤⑧">(2)</a> <a href="#ref-for-relying-party②⑤⑨">(3)</a>
-    <li><a href="#ref-for-relying-party②⑥⓪">10.1. FIDO AppID Extension (appid)</a> <a href="#ref-for-relying-party②⑥①">(2)</a> <a href="#ref-for-relying-party②⑥②">(3)</a> <a href="#ref-for-relying-party②⑥③">(4)</a> <a href="#ref-for-relying-party②⑥④">(5)</a>
-    <li><a href="#ref-for-relying-party②⑥⑤">10.2. FIDO AppID Exclusion Extension (appidExclude)</a> <a href="#ref-for-relying-party②⑥⑥">(2)</a>
-    <li><a href="#ref-for-relying-party②⑥⑦">10.3. User Verification Method Extension (uvm)</a>
-    <li><a href="#ref-for-relying-party②⑥⑧">10.4. Credential Properties Extension (credProps)</a> <a href="#ref-for-relying-party②⑥⑨">(2)</a>
-    <li><a href="#ref-for-relying-party②⑦⓪">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-relying-party②⑦①">(2)</a> <a href="#ref-for-relying-party②⑦②">(3)</a> <a href="#ref-for-relying-party②⑦③">(4)</a> <a href="#ref-for-relying-party②⑦④">(5)</a> <a href="#ref-for-relying-party②⑦⑤">(6)</a> <a href="#ref-for-relying-party②⑦⑥">(7)</a> <a href="#ref-for-relying-party②⑦⑦">(8)</a>
-    <li><a href="#ref-for-relying-party②⑦⑧">12.4. WebAuthn Extension Identifier Registrations</a>
-    <li><a href="#ref-for-relying-party②⑦⑨">13. Security Considerations</a> <a href="#ref-for-relying-party②⑧⓪">(2)</a> <a href="#ref-for-relying-party②⑧①">(3)</a> <a href="#ref-for-relying-party②⑧②">(4)</a>
-    <li><a href="#ref-for-relying-party②⑧③">13.2. Physical Proximity between Client and Authenticator</a> <a href="#ref-for-relying-party②⑧④">(2)</a>
-    <li><a href="#ref-for-relying-party②⑧⑤">13.3.2. Attestation Certificate and Attestation Certificate CA Compromise</a> <a href="#ref-for-relying-party②⑧⑥">(2)</a>
-    <li><a href="#ref-for-relying-party②⑧⑦">13.4. Security considerations for Relying Parties</a>
-    <li><a href="#ref-for-relying-party②⑧⑧">13.4.1. Security Benefits for WebAuthn Relying Parties</a> <a href="#ref-for-relying-party②⑧⑨">(2)</a> <a href="#ref-for-relying-party②⑨⓪">(3)</a> <a href="#ref-for-relying-party②⑨①">(4)</a> <a href="#ref-for-relying-party②⑨②">(5)</a> <a href="#ref-for-relying-party②⑨③">(6)</a>
-    <li><a href="#ref-for-relying-party②⑨④">13.4.2. Visibility Considerations for Embedded Usage</a> <a href="#ref-for-relying-party②⑨⑤">(2)</a> <a href="#ref-for-relying-party②⑨⑥">(3)</a> <a href="#ref-for-relying-party②⑨⑦">(4)</a>
-    <li><a href="#ref-for-relying-party②⑨⑧">13.4.3. Cryptographic Challenges</a>
-    <li><a href="#ref-for-relying-party②⑨⑨">13.4.4. Attestation Limitations</a> <a href="#ref-for-relying-party③⓪⓪">(2)</a> <a href="#ref-for-relying-party③⓪①">(3)</a> <a href="#ref-for-relying-party③⓪②">(4)</a> <a href="#ref-for-relying-party③⓪③">(5)</a> <a href="#ref-for-relying-party③⓪④">(6)</a> <a href="#ref-for-relying-party③⓪⑤">(7)</a> <a href="#ref-for-relying-party③⓪⑥">(8)</a>
-    <li><a href="#ref-for-relying-party③⓪⑦">13.4.5. Revoked Attestation Certificates</a> <a href="#ref-for-relying-party③⓪⑧">(2)</a> <a href="#ref-for-relying-party③⓪⑨">(3)</a>
-    <li><a href="#ref-for-relying-party③①⓪">13.4.6. Credential Loss and Key Mobility</a> <a href="#ref-for-relying-party③①①">(2)</a> <a href="#ref-for-relying-party③①②">(3)</a>
-    <li><a href="#ref-for-relying-party③①③">13.4.7. Unprotected account detection</a> <a href="#ref-for-relying-party③①④">(2)</a>
-    <li><a href="#ref-for-relying-party③①⑤">14. Privacy Considerations</a>
-    <li><a href="#ref-for-relying-party③①⑥">14.1. De-anonymization Prevention Measures</a> <a href="#ref-for-relying-party③①⑦">(2)</a> <a href="#ref-for-relying-party③①⑧">(3)</a> <a href="#ref-for-relying-party③①⑨">(4)</a> <a href="#ref-for-relying-party③②⓪">(5)</a> <a href="#ref-for-relying-party③②①">(6)</a> <a href="#ref-for-relying-party③②②">(7)</a>
-    <li><a href="#ref-for-relying-party③②③">14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials</a> <a href="#ref-for-relying-party③②④">(2)</a> <a href="#ref-for-relying-party③②⑤">(3)</a> <a href="#ref-for-relying-party③②⑥">(4)</a> <a href="#ref-for-relying-party③②⑦">(5)</a> <a href="#ref-for-relying-party③②⑧">(6)</a> <a href="#ref-for-relying-party③②⑨">(7)</a> <a href="#ref-for-relying-party③③⓪">(8)</a> <a href="#ref-for-relying-party③③①">(9)</a> <a href="#ref-for-relying-party③③②">(10)</a> <a href="#ref-for-relying-party③③③">(11)</a>
-    <li><a href="#ref-for-relying-party③③④">14.3. Authenticator-local Biometric Recognition</a> <a href="#ref-for-relying-party③③⑤">(2)</a> <a href="#ref-for-relying-party③③⑥">(3)</a> <a href="#ref-for-relying-party③③⑦">(4)</a> <a href="#ref-for-relying-party③③⑧">(5)</a>
-    <li><a href="#ref-for-relying-party③③⑨">14.5.1. Registration Ceremony Privacy</a> <a href="#ref-for-relying-party③④⓪">(2)</a> <a href="#ref-for-relying-party③④①">(3)</a>
-    <li><a href="#ref-for-relying-party③④②">14.5.2. Authentication Ceremony Privacy</a> <a href="#ref-for-relying-party③④③">(2)</a> <a href="#ref-for-relying-party③④④">(3)</a>
-    <li><a href="#ref-for-relying-party③④⑤">14.6. Privacy considerations for Relying Parties</a>
-    <li><a href="#ref-for-relying-party③④⑥">14.6.1. User Handle Contents</a> <a href="#ref-for-relying-party③④⑦">(2)</a>
-    <li><a href="#ref-for-relying-party③④⑧">14.6.2. Username Enumeration</a> <a href="#ref-for-relying-party③④⑨">(2)</a> <a href="#ref-for-relying-party③⑤⓪">(3)</a> <a href="#ref-for-relying-party③⑤①">(4)</a> <a href="#ref-for-relying-party③⑤②">(5)</a> <a href="#ref-for-relying-party③⑤③">(6)</a> <a href="#ref-for-relying-party③⑤④">(7)</a> <a href="#ref-for-relying-party③⑤⑤">(8)</a> <a href="#ref-for-relying-party③⑤⑥">(9)</a> <a href="#ref-for-relying-party③⑤⑦">(10)</a> <a href="#ref-for-relying-party③⑤⑧">(11)</a> <a href="#ref-for-relying-party③⑤⑨">(12)</a>
-    <li><a href="#ref-for-relying-party③⑥⓪">14.6.3. Privacy leak via credential IDs</a> <a href="#ref-for-relying-party③⑥①">(2)</a> <a href="#ref-for-relying-party③⑥②">(3)</a> <a href="#ref-for-relying-party③⑥③">(4)</a> <a href="#ref-for-relying-party③⑥④">(5)</a>
-    <li><a href="#ref-for-relying-party③⑥⑤">15. Accessibility Considerations</a> <a href="#ref-for-relying-party③⑥⑥">(2)</a>
+    <li><a href="#ref-for-relying-party⑦⑨">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-relying-party⑧⓪">(2)</a> <a href="#ref-for-relying-party⑧①">(3)</a> <a href="#ref-for-relying-party⑧②">(4)</a> <a href="#ref-for-relying-party⑧③">(5)</a>
+    <li><a href="#ref-for-relying-party⑧④">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-relying-party⑧⑤">(2)</a> <a href="#ref-for-relying-party⑧⑥">(3)</a> <a href="#ref-for-relying-party⑧⑦">(4)</a>
+    <li><a href="#ref-for-relying-party⑧⑧">5.1.4. Use an Existing Credential to Make an Assertion - PublicKeyCredential’s [[Get]](options) Method</a> <a href="#ref-for-relying-party⑧⑨">(2)</a>
+    <li><a href="#ref-for-relying-party⑨⓪">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-relying-party⑨①">(2)</a>
+    <li><a href="#ref-for-relying-party⑨②">5.1.7. Availability of User-Verifying Platform Authenticator - PublicKeyCredential’s isUserVerifyingPlatformAuthenticatorAvailable() Method</a>
+    <li><a href="#ref-for-relying-party⑨③">5.2. Authenticator Responses (interface AuthenticatorResponse)</a>
+    <li><a href="#ref-for-relying-party⑨④">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a> <a href="#ref-for-relying-party⑨⑤">(2)</a>
+    <li><a href="#ref-for-relying-party⑨⑥">5.2.1.1. Easily accessing credential data</a> <a href="#ref-for-relying-party⑨⑦">(2)</a> <a href="#ref-for-relying-party⑨⑧">(3)</a> <a href="#ref-for-relying-party⑨⑨">(4)</a> <a href="#ref-for-relying-party①⓪⓪">(5)</a> <a href="#ref-for-relying-party①⓪①">(6)</a> <a href="#ref-for-relying-party①⓪②">(7)</a>
+    <li><a href="#ref-for-relying-party①⓪③">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-relying-party①⓪④">(2)</a> <a href="#ref-for-relying-party①⓪⑤">(3)</a> <a href="#ref-for-relying-party①⓪⑥">(4)</a> <a href="#ref-for-relying-party①⓪⑦">(5)</a> <a href="#ref-for-relying-party①⓪⑧">(6)</a> <a href="#ref-for-relying-party①⓪⑨">(7)</a> <a href="#ref-for-relying-party①①⓪">(8)</a> <a href="#ref-for-relying-party①①①">(9)</a>
+    <li><a href="#ref-for-relying-party①①②">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a> <a href="#ref-for-relying-party①①③">(2)</a> <a href="#ref-for-relying-party①①④">(3)</a> <a href="#ref-for-relying-party①①⑤">(4)</a> <a href="#ref-for-relying-party①①⑥">(5)</a> <a href="#ref-for-relying-party①①⑦">(6)</a>
+    <li><a href="#ref-for-relying-party①①⑧">5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)</a> <a href="#ref-for-relying-party①①⑨">(2)</a>
+    <li><a href="#ref-for-relying-party①②⓪">5.4.3. User Account Parameters for Credential Generation (dictionary PublicKeyCredentialUserEntity)</a> <a href="#ref-for-relying-party①②①">(2)</a> <a href="#ref-for-relying-party①②②">(3)</a> <a href="#ref-for-relying-party①②③">(4)</a>
+    <li><a href="#ref-for-relying-party①②④">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a> <a href="#ref-for-relying-party①②⑤">(2)</a> <a href="#ref-for-relying-party①②⑥">(3)</a>
+    <li><a href="#ref-for-relying-party①②⑦">5.4.5. Authenticator Attachment Enumeration (enum AuthenticatorAttachment)</a> <a href="#ref-for-relying-party①②⑧">(2)</a> <a href="#ref-for-relying-party①②⑨">(3)</a>
+    <li><a href="#ref-for-relying-party①③⓪">5.4.6. Resident Key Requirement Enumeration (enum ResidentKeyRequirement)</a> <a href="#ref-for-relying-party①③①">(2)</a> <a href="#ref-for-relying-party①③②">(3)</a> <a href="#ref-for-relying-party①③③">(4)</a> <a href="#ref-for-relying-party①③④">(5)</a> <a href="#ref-for-relying-party①③⑤">(6)</a>
+    <li><a href="#ref-for-relying-party①③⑥">5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a> <a href="#ref-for-relying-party①③⑦">(2)</a> <a href="#ref-for-relying-party①③⑧">(3)</a> <a href="#ref-for-relying-party①③⑨">(4)</a> <a href="#ref-for-relying-party①④⓪">(5)</a> <a href="#ref-for-relying-party①④①">(6)</a> <a href="#ref-for-relying-party①④②">(7)</a> <a href="#ref-for-relying-party①④③">(8)</a>
+    <li><a href="#ref-for-relying-party①④④">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-relying-party①④⑤">(2)</a> <a href="#ref-for-relying-party①④⑥">(3)</a> <a href="#ref-for-relying-party①④⑦">(4)</a> <a href="#ref-for-relying-party①④⑧">(5)</a> <a href="#ref-for-relying-party①④⑨">(6)</a> <a href="#ref-for-relying-party①⑤⓪">(7)</a> <a href="#ref-for-relying-party①⑤①">(8)</a> <a href="#ref-for-relying-party①⑤②">(9)</a>
+    <li><a href="#ref-for-relying-party①⑤③">5.7.3. Authentication Extensions Authenticator Inputs (CDDL type AuthenticationExtensionsAuthenticatorInputs)</a>
+    <li><a href="#ref-for-relying-party①⑤④">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a> <a href="#ref-for-relying-party①⑤⑤">(2)</a> <a href="#ref-for-relying-party①⑤⑥">(3)</a> <a href="#ref-for-relying-party①⑤⑦">(4)</a> <a href="#ref-for-relying-party①⑤⑧">(5)</a>
+    <li><a href="#ref-for-relying-party①⑤⑨">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-relying-party①⑥⓪">(2)</a>
+    <li><a href="#ref-for-relying-party①⑥①">5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>
+    <li><a href="#ref-for-relying-party①⑥②">5.8.6. User Verification Requirement Enumeration (enum UserVerificationRequirement)</a> <a href="#ref-for-relying-party①⑥③">(2)</a> <a href="#ref-for-relying-party①⑥④">(3)</a>
+    <li><a href="#ref-for-relying-party①⑥⑤">5.10. Using Web Authentication within iframe elements</a>
+    <li><a href="#ref-for-relying-party①⑥⑥">6. WebAuthn Authenticator Model</a> <a href="#ref-for-relying-party①⑥⑦">(2)</a> <a href="#ref-for-relying-party①⑥⑧">(3)</a> <a href="#ref-for-relying-party①⑥⑨">(4)</a>
+    <li><a href="#ref-for-relying-party①⑦⓪">6.1. Authenticator Data</a>
+    <li><a href="#ref-for-relying-party①⑦①">6.1.1. Signature Counter Considerations</a> <a href="#ref-for-relying-party①⑦②">(2)</a> <a href="#ref-for-relying-party①⑦③">(3)</a> <a href="#ref-for-relying-party①⑦④">(4)</a> <a href="#ref-for-relying-party①⑦⑤">(5)</a>
+    <li><a href="#ref-for-relying-party①⑦⑥">6.1.3. Credential Backup State</a> <a href="#ref-for-relying-party①⑦⑦">(2)</a> <a href="#ref-for-relying-party①⑦⑧">(3)</a> <a href="#ref-for-relying-party①⑦⑨">(4)</a> <a href="#ref-for-relying-party①⑧⓪">(5)</a>
+    <li><a href="#ref-for-relying-party①⑧①">6.2. Authenticator Taxonomy</a>
+    <li><a href="#ref-for-relying-party①⑧②">6.2.2. Credential Storage Modality</a> <a href="#ref-for-relying-party①⑧③">(2)</a> <a href="#ref-for-relying-party①⑧④">(3)</a>
+    <li><a href="#ref-for-relying-party①⑧⑤">6.2.3. Authentication Factor Capability</a> <a href="#ref-for-relying-party①⑧⑥">(2)</a> <a href="#ref-for-relying-party①⑧⑦">(3)</a>
+    <li><a href="#ref-for-relying-party①⑧⑧">6.3.2. The authenticatorMakeCredential Operation</a> <a href="#ref-for-relying-party①⑧⑨">(2)</a> <a href="#ref-for-relying-party①⑨⓪">(3)</a> <a href="#ref-for-relying-party①⑨①">(4)</a> <a href="#ref-for-relying-party①⑨②">(5)</a> <a href="#ref-for-relying-party①⑨③">(6)</a>
+    <li><a href="#ref-for-relying-party①⑨④">6.3.3. The authenticatorGetAssertion Operation</a> <a href="#ref-for-relying-party①⑨⑤">(2)</a> <a href="#ref-for-relying-party①⑨⑥">(3)</a>
+    <li><a href="#ref-for-relying-party①⑨⑦">6.4. String Handling</a>
+    <li><a href="#ref-for-relying-party①⑨⑧">6.4.1. String Truncation</a> <a href="#ref-for-relying-party①⑨⑨">(2)</a>
+    <li><a href="#ref-for-relying-party②⓪⓪">6.5. Attestation</a> <a href="#ref-for-relying-party②⓪①">(2)</a> <a href="#ref-for-relying-party②⓪②">(3)</a> <a href="#ref-for-relying-party②⓪③">(4)</a> <a href="#ref-for-relying-party②⓪④">(5)</a> <a href="#ref-for-relying-party②⓪⑤">(6)</a> <a href="#ref-for-relying-party②⓪⑥">(7)</a> <a href="#ref-for-relying-party②⓪⑦">(8)</a>
+    <li><a href="#ref-for-relying-party②⓪⑧">6.5.3. Attestation Types</a> <a href="#ref-for-relying-party②⓪⑨">(2)</a> <a href="#ref-for-relying-party②①⓪">(3)</a> <a href="#ref-for-relying-party②①①">(4)</a> <a href="#ref-for-relying-party②①②">(5)</a>
+    <li><a href="#ref-for-relying-party②①③">7. WebAuthn Relying Party Operations</a> <a href="#ref-for-relying-party②①④">(2)</a> <a href="#ref-for-relying-party②①⑤">(3)</a> <a href="#ref-for-relying-party②①⑥">(4)</a>
+    <li><a href="#ref-for-relying-party②①⑦">7.1. Registering a New Credential</a> <a href="#ref-for-relying-party②①⑧">(2)</a> <a href="#ref-for-relying-party②①⑨">(3)</a> <a href="#ref-for-relying-party②②⓪">(4)</a> <a href="#ref-for-relying-party②②①">(5)</a> <a href="#ref-for-relying-party②②②">(6)</a> <a href="#ref-for-relying-party②②③">(7)</a> <a href="#ref-for-relying-party②②④">(8)</a> <a href="#ref-for-relying-party②②⑤">(9)</a> <a href="#ref-for-relying-party②②⑥">(10)</a> <a href="#ref-for-relying-party②②⑦">(11)</a> <a href="#ref-for-relying-party②②⑧">(12)</a> <a href="#ref-for-relying-party②②⑨">(13)</a> <a href="#ref-for-relying-party②③⓪">(14)</a> <a href="#ref-for-relying-party②③①">(15)</a> <a href="#ref-for-relying-party②③②">(16)</a> <a href="#ref-for-relying-party②③③">(17)</a> <a href="#ref-for-relying-party②③④">(18)</a> <a href="#ref-for-relying-party②③⑤">(19)</a> <a href="#ref-for-relying-party②③⑥">(20)</a> <a href="#ref-for-relying-party②③⑦">(21)</a> <a href="#ref-for-relying-party②③⑧">(22)</a> <a href="#ref-for-relying-party②③⑨">(23)</a> <a href="#ref-for-relying-party②④⓪">(24)</a>
+    <li><a href="#ref-for-relying-party②④①">7.2. Verifying an Authentication Assertion</a> <a href="#ref-for-relying-party②④②">(2)</a> <a href="#ref-for-relying-party②④③">(3)</a> <a href="#ref-for-relying-party②④④">(4)</a> <a href="#ref-for-relying-party②④⑤">(5)</a> <a href="#ref-for-relying-party②④⑥">(6)</a> <a href="#ref-for-relying-party②④⑦">(7)</a> <a href="#ref-for-relying-party②④⑧">(8)</a> <a href="#ref-for-relying-party②④⑨">(9)</a> <a href="#ref-for-relying-party②⑤⓪">(10)</a> <a href="#ref-for-relying-party②⑤①">(11)</a> <a href="#ref-for-relying-party②⑤②">(12)</a> <a href="#ref-for-relying-party②⑤③">(13)</a>
+    <li><a href="#ref-for-relying-party②⑤④">9. WebAuthn Extensions</a> <a href="#ref-for-relying-party②⑤⑤">(2)</a> <a href="#ref-for-relying-party②⑤⑥">(3)</a>
+    <li><a href="#ref-for-relying-party②⑤⑦">9.2. Defining Extensions</a>
+    <li><a href="#ref-for-relying-party②⑤⑧">9.3. Extending Request Parameters</a> <a href="#ref-for-relying-party②⑤⑨">(2)</a> <a href="#ref-for-relying-party②⑥⓪">(3)</a>
+    <li><a href="#ref-for-relying-party②⑥①">10.1. FIDO AppID Extension (appid)</a> <a href="#ref-for-relying-party②⑥②">(2)</a> <a href="#ref-for-relying-party②⑥③">(3)</a> <a href="#ref-for-relying-party②⑥④">(4)</a> <a href="#ref-for-relying-party②⑥⑤">(5)</a>
+    <li><a href="#ref-for-relying-party②⑥⑥">10.2. FIDO AppID Exclusion Extension (appidExclude)</a> <a href="#ref-for-relying-party②⑥⑦">(2)</a>
+    <li><a href="#ref-for-relying-party②⑥⑧">10.3. User Verification Method Extension (uvm)</a>
+    <li><a href="#ref-for-relying-party②⑥⑨">10.4. Credential Properties Extension (credProps)</a> <a href="#ref-for-relying-party②⑦⓪">(2)</a>
+    <li><a href="#ref-for-relying-party②⑦①">10.5. Large blob storage extension (largeBlob)</a> <a href="#ref-for-relying-party②⑦②">(2)</a> <a href="#ref-for-relying-party②⑦③">(3)</a> <a href="#ref-for-relying-party②⑦④">(4)</a> <a href="#ref-for-relying-party②⑦⑤">(5)</a> <a href="#ref-for-relying-party②⑦⑥">(6)</a> <a href="#ref-for-relying-party②⑦⑦">(7)</a> <a href="#ref-for-relying-party②⑦⑧">(8)</a>
+    <li><a href="#ref-for-relying-party②⑦⑨">12.4. WebAuthn Extension Identifier Registrations</a>
+    <li><a href="#ref-for-relying-party②⑧⓪">13. Security Considerations</a> <a href="#ref-for-relying-party②⑧①">(2)</a> <a href="#ref-for-relying-party②⑧②">(3)</a> <a href="#ref-for-relying-party②⑧③">(4)</a>
+    <li><a href="#ref-for-relying-party②⑧④">13.2. Physical Proximity between Client and Authenticator</a> <a href="#ref-for-relying-party②⑧⑤">(2)</a>
+    <li><a href="#ref-for-relying-party②⑧⑥">13.3.2. Attestation Certificate and Attestation Certificate CA Compromise</a> <a href="#ref-for-relying-party②⑧⑦">(2)</a>
+    <li><a href="#ref-for-relying-party②⑧⑧">13.4. Security considerations for Relying Parties</a>
+    <li><a href="#ref-for-relying-party②⑧⑨">13.4.1. Security Benefits for WebAuthn Relying Parties</a> <a href="#ref-for-relying-party②⑨⓪">(2)</a> <a href="#ref-for-relying-party②⑨①">(3)</a> <a href="#ref-for-relying-party②⑨②">(4)</a> <a href="#ref-for-relying-party②⑨③">(5)</a> <a href="#ref-for-relying-party②⑨④">(6)</a>
+    <li><a href="#ref-for-relying-party②⑨⑤">13.4.2. Visibility Considerations for Embedded Usage</a> <a href="#ref-for-relying-party②⑨⑥">(2)</a> <a href="#ref-for-relying-party②⑨⑦">(3)</a> <a href="#ref-for-relying-party②⑨⑧">(4)</a>
+    <li><a href="#ref-for-relying-party②⑨⑨">13.4.3. Cryptographic Challenges</a>
+    <li><a href="#ref-for-relying-party③⓪⓪">13.4.4. Attestation Limitations</a> <a href="#ref-for-relying-party③⓪①">(2)</a> <a href="#ref-for-relying-party③⓪②">(3)</a> <a href="#ref-for-relying-party③⓪③">(4)</a> <a href="#ref-for-relying-party③⓪④">(5)</a> <a href="#ref-for-relying-party③⓪⑤">(6)</a> <a href="#ref-for-relying-party③⓪⑥">(7)</a> <a href="#ref-for-relying-party③⓪⑦">(8)</a>
+    <li><a href="#ref-for-relying-party③⓪⑧">13.4.5. Revoked Attestation Certificates</a> <a href="#ref-for-relying-party③⓪⑨">(2)</a> <a href="#ref-for-relying-party③①⓪">(3)</a>
+    <li><a href="#ref-for-relying-party③①①">13.4.6. Credential Loss and Key Mobility</a> <a href="#ref-for-relying-party③①②">(2)</a> <a href="#ref-for-relying-party③①③">(3)</a>
+    <li><a href="#ref-for-relying-party③①④">13.4.7. Unprotected account detection</a> <a href="#ref-for-relying-party③①⑤">(2)</a>
+    <li><a href="#ref-for-relying-party③①⑥">14. Privacy Considerations</a>
+    <li><a href="#ref-for-relying-party③①⑦">14.1. De-anonymization Prevention Measures</a> <a href="#ref-for-relying-party③①⑧">(2)</a> <a href="#ref-for-relying-party③①⑨">(3)</a> <a href="#ref-for-relying-party③②⓪">(4)</a> <a href="#ref-for-relying-party③②①">(5)</a> <a href="#ref-for-relying-party③②②">(6)</a> <a href="#ref-for-relying-party③②③">(7)</a>
+    <li><a href="#ref-for-relying-party③②④">14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials</a> <a href="#ref-for-relying-party③②⑤">(2)</a> <a href="#ref-for-relying-party③②⑥">(3)</a> <a href="#ref-for-relying-party③②⑦">(4)</a> <a href="#ref-for-relying-party③②⑧">(5)</a> <a href="#ref-for-relying-party③②⑨">(6)</a> <a href="#ref-for-relying-party③③⓪">(7)</a> <a href="#ref-for-relying-party③③①">(8)</a> <a href="#ref-for-relying-party③③②">(9)</a> <a href="#ref-for-relying-party③③③">(10)</a> <a href="#ref-for-relying-party③③④">(11)</a>
+    <li><a href="#ref-for-relying-party③③⑤">14.3. Authenticator-local Biometric Recognition</a> <a href="#ref-for-relying-party③③⑥">(2)</a> <a href="#ref-for-relying-party③③⑦">(3)</a> <a href="#ref-for-relying-party③③⑧">(4)</a> <a href="#ref-for-relying-party③③⑨">(5)</a>
+    <li><a href="#ref-for-relying-party③④⓪">14.5.1. Registration Ceremony Privacy</a> <a href="#ref-for-relying-party③④①">(2)</a> <a href="#ref-for-relying-party③④②">(3)</a>
+    <li><a href="#ref-for-relying-party③④③">14.5.2. Authentication Ceremony Privacy</a> <a href="#ref-for-relying-party③④④">(2)</a> <a href="#ref-for-relying-party③④⑤">(3)</a>
+    <li><a href="#ref-for-relying-party③④⑥">14.6. Privacy considerations for Relying Parties</a>
+    <li><a href="#ref-for-relying-party③④⑦">14.6.1. User Handle Contents</a> <a href="#ref-for-relying-party③④⑧">(2)</a>
+    <li><a href="#ref-for-relying-party③④⑨">14.6.2. Username Enumeration</a> <a href="#ref-for-relying-party③⑤⓪">(2)</a> <a href="#ref-for-relying-party③⑤①">(3)</a> <a href="#ref-for-relying-party③⑤②">(4)</a> <a href="#ref-for-relying-party③⑤③">(5)</a> <a href="#ref-for-relying-party③⑤④">(6)</a> <a href="#ref-for-relying-party③⑤⑤">(7)</a> <a href="#ref-for-relying-party③⑤⑥">(8)</a> <a href="#ref-for-relying-party③⑤⑦">(9)</a> <a href="#ref-for-relying-party③⑤⑧">(10)</a> <a href="#ref-for-relying-party③⑤⑨">(11)</a> <a href="#ref-for-relying-party③⑥⓪">(12)</a>
+    <li><a href="#ref-for-relying-party③⑥①">14.6.3. Privacy leak via credential IDs</a> <a href="#ref-for-relying-party③⑥②">(2)</a> <a href="#ref-for-relying-party③⑥③">(3)</a> <a href="#ref-for-relying-party③⑥④">(4)</a> <a href="#ref-for-relying-party③⑥⑤">(5)</a>
+    <li><a href="#ref-for-relying-party③⑥⑥">15. Accessibility Considerations</a> <a href="#ref-for-relying-party③⑥⑦">(2)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="relying-party-identifier">
@@ -10555,40 +10917,42 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
     <li><a href="#ref-for-webauthn-relying-party①①">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a>
     <li><a href="#ref-for-webauthn-relying-party①②">5.1.4. Use an Existing Credential to Make an Assertion - PublicKeyCredential’s [[Get]](options) Method</a>
     <li><a href="#ref-for-webauthn-relying-party①③">5.1.7. Availability of User-Verifying Platform Authenticator - PublicKeyCredential’s isUserVerifyingPlatformAuthenticatorAvailable() Method</a>
-    <li><a href="#ref-for-webauthn-relying-party①④">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a>
-    <li><a href="#ref-for-webauthn-relying-party①⑤">5.2.2. Web Authentication Assertion (interface AuthenticatorAssertionResponse)</a>
-    <li><a href="#ref-for-webauthn-relying-party①⑥">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a>
-    <li><a href="#ref-for-webauthn-relying-party①⑦">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a>
-    <li><a href="#ref-for-webauthn-relying-party①⑧">5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a>
-    <li><a href="#ref-for-webauthn-relying-party①⑨">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a>
-    <li><a href="#ref-for-webauthn-relying-party②⓪">5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>
-    <li><a href="#ref-for-webauthn-relying-party②①">5.8.6. User Verification Requirement Enumeration (enum UserVerificationRequirement)</a>
-    <li><a href="#ref-for-webauthn-relying-party②②">6. WebAuthn Authenticator Model</a>
-    <li><a href="#ref-for-webauthn-relying-party②③">6.1. Authenticator Data</a>
-    <li><a href="#ref-for-webauthn-relying-party②④">6.1.1. Signature Counter Considerations</a>
-    <li><a href="#ref-for-webauthn-relying-party②⑤">6.5. Attestation</a>
-    <li><a href="#ref-for-webauthn-relying-party②⑥">7. WebAuthn Relying Party Operations</a> <a href="#ref-for-webauthn-relying-party②⑦">(2)</a>
-    <li><a href="#ref-for-webauthn-relying-party②⑧">8.4. Android Key Attestation Statement Format</a>
-    <li><a href="#ref-for-webauthn-relying-party②⑨">8.7. None Attestation Statement Format</a>
-    <li><a href="#ref-for-webauthn-relying-party③⓪">9. WebAuthn Extensions</a>
-    <li><a href="#ref-for-webauthn-relying-party③①">9.2. Defining Extensions</a>
-    <li><a href="#ref-for-webauthn-relying-party③②">9.3. Extending Request Parameters</a>
-    <li><a href="#ref-for-webauthn-relying-party③③">10.1. FIDO AppID Extension (appid)</a>
-    <li><a href="#ref-for-webauthn-relying-party③④">10.2. FIDO AppID Exclusion Extension (appidExclude)</a>
-    <li><a href="#ref-for-webauthn-relying-party③⑤">10.4. Credential Properties Extension (credProps)</a>
-    <li><a href="#ref-for-webauthn-relying-party③⑥">12.3. WebAuthn Extension Identifier Registrations Updates</a> <a href="#ref-for-webauthn-relying-party③⑦">(2)</a>
-    <li><a href="#ref-for-webauthn-relying-party③⑧">12.4. WebAuthn Extension Identifier Registrations</a> <a href="#ref-for-webauthn-relying-party③⑨">(2)</a>
-    <li><a href="#ref-for-webauthn-relying-party④⓪">13. Security Considerations</a>
-    <li><a href="#ref-for-webauthn-relying-party④①">13.1. Credential ID Unsigned</a>
-    <li><a href="#ref-for-webauthn-relying-party④②">13.3.2. Attestation Certificate and Attestation Certificate CA Compromise</a>
-    <li><a href="#ref-for-webauthn-relying-party④③">13.4.1. Security Benefits for WebAuthn Relying Parties</a>
-    <li><a href="#ref-for-webauthn-relying-party④④">13.4.4. Attestation Limitations</a>
-    <li><a href="#ref-for-webauthn-relying-party④⑤">14.1. De-anonymization Prevention Measures</a>
-    <li><a href="#ref-for-webauthn-relying-party④⑥">14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials</a>
-    <li><a href="#ref-for-webauthn-relying-party④⑦">14.3. Authenticator-local Biometric Recognition</a>
-    <li><a href="#ref-for-webauthn-relying-party④⑧">14.5.1. Registration Ceremony Privacy</a>
-    <li><a href="#ref-for-webauthn-relying-party④⑨">14.5.2. Authentication Ceremony Privacy</a>
-    <li><a href="#ref-for-webauthn-relying-party⑤⓪">14.6.2. Username Enumeration</a>
+    <li><a href="#ref-for-webauthn-relying-party①④">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-webauthn-relying-party①⑤">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+    <li><a href="#ref-for-webauthn-relying-party①⑥">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a>
+    <li><a href="#ref-for-webauthn-relying-party①⑦">5.2.2. Web Authentication Assertion (interface AuthenticatorAssertionResponse)</a>
+    <li><a href="#ref-for-webauthn-relying-party①⑧">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a>
+    <li><a href="#ref-for-webauthn-relying-party①⑨">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a>
+    <li><a href="#ref-for-webauthn-relying-party②⓪">5.4.7. Attestation Conveyance Preference Enumeration (enum AttestationConveyancePreference)</a>
+    <li><a href="#ref-for-webauthn-relying-party②①">5.8.1. Client Data Used in WebAuthn Signatures (dictionary CollectedClientData)</a>
+    <li><a href="#ref-for-webauthn-relying-party②②">5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>
+    <li><a href="#ref-for-webauthn-relying-party②③">5.8.6. User Verification Requirement Enumeration (enum UserVerificationRequirement)</a>
+    <li><a href="#ref-for-webauthn-relying-party②④">6. WebAuthn Authenticator Model</a>
+    <li><a href="#ref-for-webauthn-relying-party②⑤">6.1. Authenticator Data</a>
+    <li><a href="#ref-for-webauthn-relying-party②⑥">6.1.1. Signature Counter Considerations</a>
+    <li><a href="#ref-for-webauthn-relying-party②⑦">6.5. Attestation</a>
+    <li><a href="#ref-for-webauthn-relying-party②⑧">7. WebAuthn Relying Party Operations</a> <a href="#ref-for-webauthn-relying-party②⑨">(2)</a>
+    <li><a href="#ref-for-webauthn-relying-party③⓪">8.4. Android Key Attestation Statement Format</a>
+    <li><a href="#ref-for-webauthn-relying-party③①">8.7. None Attestation Statement Format</a>
+    <li><a href="#ref-for-webauthn-relying-party③②">9. WebAuthn Extensions</a>
+    <li><a href="#ref-for-webauthn-relying-party③③">9.2. Defining Extensions</a>
+    <li><a href="#ref-for-webauthn-relying-party③④">9.3. Extending Request Parameters</a>
+    <li><a href="#ref-for-webauthn-relying-party③⑤">10.1. FIDO AppID Extension (appid)</a>
+    <li><a href="#ref-for-webauthn-relying-party③⑥">10.2. FIDO AppID Exclusion Extension (appidExclude)</a>
+    <li><a href="#ref-for-webauthn-relying-party③⑦">10.4. Credential Properties Extension (credProps)</a>
+    <li><a href="#ref-for-webauthn-relying-party③⑧">12.3. WebAuthn Extension Identifier Registrations Updates</a> <a href="#ref-for-webauthn-relying-party③⑨">(2)</a>
+    <li><a href="#ref-for-webauthn-relying-party④⓪">12.4. WebAuthn Extension Identifier Registrations</a> <a href="#ref-for-webauthn-relying-party④①">(2)</a>
+    <li><a href="#ref-for-webauthn-relying-party④②">13. Security Considerations</a>
+    <li><a href="#ref-for-webauthn-relying-party④③">13.1. Credential ID Unsigned</a>
+    <li><a href="#ref-for-webauthn-relying-party④④">13.3.2. Attestation Certificate and Attestation Certificate CA Compromise</a>
+    <li><a href="#ref-for-webauthn-relying-party④⑤">13.4.1. Security Benefits for WebAuthn Relying Parties</a>
+    <li><a href="#ref-for-webauthn-relying-party④⑥">13.4.4. Attestation Limitations</a>
+    <li><a href="#ref-for-webauthn-relying-party④⑦">14.1. De-anonymization Prevention Measures</a>
+    <li><a href="#ref-for-webauthn-relying-party④⑧">14.2. Anonymous, Scoped, Non-correlatable Public Key Credentials</a>
+    <li><a href="#ref-for-webauthn-relying-party④⑨">14.3. Authenticator-local Biometric Recognition</a>
+    <li><a href="#ref-for-webauthn-relying-party⑤⓪">14.5.1. Registration Ceremony Privacy</a>
+    <li><a href="#ref-for-webauthn-relying-party⑤①">14.5.2. Authentication Ceremony Privacy</a>
+    <li><a href="#ref-for-webauthn-relying-party⑤②">14.6.2. Username Enumeration</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="web-application">
@@ -10617,16 +10981,18 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <b><a href="#publickeycredential">#publickeycredential</a></b><b>Referenced in:</b>
    <ul>
     <li><a href="#ref-for-publickeycredential">1. Introduction</a>
-    <li><a href="#ref-for-publickeycredential①">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-publickeycredential②">(2)</a> <a href="#ref-for-publickeycredential③">(3)</a> <a href="#ref-for-publickeycredential④">(4)</a> <a href="#ref-for-publickeycredential⑤">(5)</a> <a href="#ref-for-publickeycredential⑥">(6)</a> <a href="#ref-for-publickeycredential⑦">(7)</a> <a href="#ref-for-publickeycredential⑧">(8)</a>
-    <li><a href="#ref-for-publickeycredential⑨">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-publickeycredential①⓪">(2)</a>
-    <li><a href="#ref-for-publickeycredential①①">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a>
-    <li><a href="#ref-for-publickeycredential①②">5.1.5. Store an Existing Credential - PublicKeyCredential’s [[Store]](credential, sameOriginWithAncestors) Method</a> <a href="#ref-for-publickeycredential①③">(2)</a>
-    <li><a href="#ref-for-publickeycredential①④">5.1.7. Availability of User-Verifying Platform Authenticator - PublicKeyCredential’s isUserVerifyingPlatformAuthenticatorAvailable() Method</a>
-    <li><a href="#ref-for-publickeycredential①⑤">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a>
-    <li><a href="#ref-for-publickeycredential①⑥">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-publickeycredential①⑦">(2)</a> <a href="#ref-for-publickeycredential①⑧">(3)</a> <a href="#ref-for-publickeycredential①⑨">(4)</a>
-    <li><a href="#ref-for-publickeycredential②⓪">7. WebAuthn Relying Party Operations</a>
-    <li><a href="#ref-for-publickeycredential②①">10.4. Credential Properties Extension (credProps)</a>
-    <li><a href="#ref-for-publickeycredential②②">13.4.4. Attestation Limitations</a>
+    <li><a href="#ref-for-publickeycredential①">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-publickeycredential②">(2)</a> <a href="#ref-for-publickeycredential③">(3)</a> <a href="#ref-for-publickeycredential④">(4)</a> <a href="#ref-for-publickeycredential⑤">(5)</a> <a href="#ref-for-publickeycredential⑥">(6)</a> <a href="#ref-for-publickeycredential⑦">(7)</a> <a href="#ref-for-publickeycredential⑧">(8)</a> <a href="#ref-for-publickeycredential⑨">(9)</a>
+    <li><a href="#ref-for-publickeycredential①⓪">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-publickeycredential①①">(2)</a>
+    <li><a href="#ref-for-publickeycredential①②">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a>
+    <li><a href="#ref-for-publickeycredential①③">5.1.5. Store an Existing Credential - PublicKeyCredential’s [[Store]](credential, sameOriginWithAncestors) Method</a> <a href="#ref-for-publickeycredential①④">(2)</a>
+    <li><a href="#ref-for-publickeycredential①⑤">5.1.7. Availability of User-Verifying Platform Authenticator - PublicKeyCredential’s isUserVerifyingPlatformAuthenticatorAvailable() Method</a>
+    <li><a href="#ref-for-publickeycredential①⑥">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-publickeycredential①⑦">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+    <li><a href="#ref-for-publickeycredential①⑧">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a>
+    <li><a href="#ref-for-publickeycredential①⑨">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-publickeycredential②⓪">(2)</a> <a href="#ref-for-publickeycredential②①">(3)</a> <a href="#ref-for-publickeycredential②②">(4)</a>
+    <li><a href="#ref-for-publickeycredential②③">7. WebAuthn Relying Party Operations</a>
+    <li><a href="#ref-for-publickeycredential②④">10.4. Credential Properties Extension (credProps)</a>
+    <li><a href="#ref-for-publickeycredential②⑤">13.4.4. Attestation Limitations</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-publickeycredential-rawid">
@@ -10641,10 +11007,16 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
   <aside class="dfn-panel" data-for="dom-publickeycredential-getclientextensionresults">
    <b><a href="#dom-publickeycredential-getclientextensionresults">#dom-publickeycredential-getclientextensionresults</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-dom-publickeycredential-getclientextensionresults">5.1. PublicKeyCredential Interface</a>
-    <li><a href="#ref-for-dom-publickeycredential-getclientextensionresults①">7.1. Registering a New Credential</a>
-    <li><a href="#ref-for-dom-publickeycredential-getclientextensionresults②">7.2. Verifying an Authentication Assertion</a>
-    <li><a href="#ref-for-dom-publickeycredential-getclientextensionresults③">9.4. Client Extension Processing</a>
+    <li><a href="#ref-for-dom-publickeycredential-getclientextensionresults">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-dom-publickeycredential-getclientextensionresults①">(2)</a>
+    <li><a href="#ref-for-dom-publickeycredential-getclientextensionresults②">7.1. Registering a New Credential</a>
+    <li><a href="#ref-for-dom-publickeycredential-getclientextensionresults③">7.2. Verifying an Authentication Assertion</a>
+    <li><a href="#ref-for-dom-publickeycredential-getclientextensionresults④">9.4. Client Extension Processing</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-publickeycredential-tojson">
+   <b><a href="#dom-publickeycredential-tojson">#dom-publickeycredential-tojson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-publickeycredential-tojson">5.1. PublicKeyCredential Interface</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-publickeycredential-response">
@@ -10668,6 +11040,70 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
     <li><a href="#ref-for-dom-publickeycredential-authenticatorattachment④">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a>
    </ul>
   </aside>
+  <aside class="dfn-panel" data-for="typedefdef-base64urlstring">
+   <b><a href="#typedefdef-base64urlstring">#typedefdef-base64urlstring</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-typedefdef-base64urlstring">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-typedefdef-base64urlstring①">(2)</a> <a href="#ref-for-typedefdef-base64urlstring②">(3)</a> <a href="#ref-for-typedefdef-base64urlstring③">(4)</a> <a href="#ref-for-typedefdef-base64urlstring④">(5)</a> <a href="#ref-for-typedefdef-base64urlstring⑤">(6)</a> <a href="#ref-for-typedefdef-base64urlstring⑥">(7)</a> <a href="#ref-for-typedefdef-base64urlstring⑦">(8)</a> <a href="#ref-for-typedefdef-base64urlstring⑧">(9)</a> <a href="#ref-for-typedefdef-base64urlstring⑨">(10)</a>
+    <li><a href="#ref-for-typedefdef-base64urlstring①⓪">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a> <a href="#ref-for-typedefdef-base64urlstring①①">(2)</a> <a href="#ref-for-typedefdef-base64urlstring①②">(3)</a>
+    <li><a href="#ref-for-typedefdef-base64urlstring①③">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="typedefdef-publickeycredentialjson">
+   <b><a href="#typedefdef-publickeycredentialjson">#typedefdef-publickeycredentialjson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-typedefdef-publickeycredentialjson">5.1. PublicKeyCredential Interface</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-registrationresponsejson">
+   <b><a href="#dictdef-registrationresponsejson">#dictdef-registrationresponsejson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-registrationresponsejson">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-dictdef-registrationresponsejson①">(2)</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-registrationresponsejson-clientextensionresults">
+   <b><a href="#dom-registrationresponsejson-clientextensionresults">#dom-registrationresponsejson-clientextensionresults</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-registrationresponsejson-clientextensionresults">5.1. PublicKeyCredential Interface</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-authenticatorattestationresponsejson">
+   <b><a href="#dictdef-authenticatorattestationresponsejson">#dictdef-authenticatorattestationresponsejson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-authenticatorattestationresponsejson">5.1. PublicKeyCredential Interface</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-authenticatorattestationresponsejson-transports">
+   <b><a href="#dom-authenticatorattestationresponsejson-transports">#dom-authenticatorattestationresponsejson-transports</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-authenticatorattestationresponsejson-transports">5.1. PublicKeyCredential Interface</a>
+    <li><a href="#ref-for-dom-authenticatorattestationresponsejson-transports①">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a>
+    <li><a href="#ref-for-dom-authenticatorattestationresponsejson-transports②">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-dom-authenticatorattestationresponsejson-transports③">(2)</a> <a href="#ref-for-dom-authenticatorattestationresponsejson-transports④">(3)</a> <a href="#ref-for-dom-authenticatorattestationresponsejson-transports⑤">(4)</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-authenticationresponsejson">
+   <b><a href="#dictdef-authenticationresponsejson">#dictdef-authenticationresponsejson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-authenticationresponsejson">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-dictdef-authenticationresponsejson①">(2)</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-authenticationresponsejson-clientextensionresults">
+   <b><a href="#dom-authenticationresponsejson-clientextensionresults">#dom-authenticationresponsejson-clientextensionresults</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-authenticationresponsejson-clientextensionresults">5.1. PublicKeyCredential Interface</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-authenticatorassertionresponsejson">
+   <b><a href="#dictdef-authenticatorassertionresponsejson">#dictdef-authenticatorassertionresponsejson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-authenticatorassertionresponsejson">5.1. PublicKeyCredential Interface</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-authenticationextensionsclientoutputsjson">
+   <b><a href="#dictdef-authenticationextensionsclientoutputsjson">#dictdef-authenticationextensionsclientoutputsjson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-authenticationextensionsclientoutputsjson">5.1. PublicKeyCredential Interface</a> <a href="#ref-for-dictdef-authenticationextensionsclientoutputsjson①">(2)</a>
+   </ul>
+  </aside>
   <aside class="dfn-panel" data-for="dom-publickeycredential-identifier-slot">
    <b><a href="#dom-publickeycredential-identifier-slot">#dom-publickeycredential-identifier-slot</a></b><b>Referenced in:</b>
    <ul>
@@ -10854,6 +11290,50 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
     <li><a href="#ref-for-dom-publickeycredential-isuserverifyingplatformauthenticatoravailable">5.1. PublicKeyCredential Interface</a>
    </ul>
   </aside>
+  <aside class="dfn-panel" data-for="dom-publickeycredential-parsecreationoptionsfromjson-options-options">
+   <b><a href="#dom-publickeycredential-parsecreationoptionsfromjson-options-options">#dom-publickeycredential-parsecreationoptionsfromjson-options-options</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-publickeycredential-parsecreationoptionsfromjson-options-options">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-publickeycredentialcreationoptionsjson">
+   <b><a href="#dictdef-publickeycredentialcreationoptionsjson">#dictdef-publickeycredentialcreationoptionsjson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptionsjson">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a> <a href="#ref-for-dictdef-publickeycredentialcreationoptionsjson①">(2)</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-publickeycredentialuserentityjson">
+   <b><a href="#dictdef-publickeycredentialuserentityjson">#dictdef-publickeycredentialuserentityjson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-publickeycredentialuserentityjson">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-publickeycredentialdescriptorjson">
+   <b><a href="#dictdef-publickeycredentialdescriptorjson">#dictdef-publickeycredentialdescriptorjson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-publickeycredentialdescriptorjson">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialdescriptorjson①">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-authenticationextensionsclientinputsjson">
+   <b><a href="#dictdef-authenticationextensionsclientinputsjson">#dictdef-authenticationextensionsclientinputsjson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-authenticationextensionsclientinputsjson">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a> <a href="#ref-for-dictdef-authenticationextensionsclientinputsjson①">(2)</a>
+    <li><a href="#ref-for-dictdef-authenticationextensionsclientinputsjson②">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a> <a href="#ref-for-dictdef-authenticationextensionsclientinputsjson③">(2)</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dom-publickeycredential-parserequestoptionsfromjson-options-options">
+   <b><a href="#dom-publickeycredential-parserequestoptionsfromjson-options-options">#dom-publickeycredential-parserequestoptionsfromjson-options-options</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dom-publickeycredential-parserequestoptionsfromjson-options-options">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+   </ul>
+  </aside>
+  <aside class="dfn-panel" data-for="dictdef-publickeycredentialrequestoptionsjson">
+   <b><a href="#dictdef-publickeycredentialrequestoptionsjson">#dictdef-publickeycredentialrequestoptionsjson</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptionsjson">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a> <a href="#ref-for-dictdef-publickeycredentialrequestoptionsjson①">(2)</a>
+   </ul>
+  </aside>
   <aside class="dfn-panel" data-for="authenticatorresponse">
    <b><a href="#authenticatorresponse">#authenticatorresponse</a></b><b>Referenced in:</b>
    <ul>
@@ -10890,11 +11370,12 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
   <aside class="dfn-panel" data-for="dom-authenticatorattestationresponse-gettransports">
    <b><a href="#dom-authenticatorattestationresponse-gettransports">#dom-authenticatorattestationresponse-gettransports</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a>
-    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports①">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-dom-authenticatorattestationresponse-gettransports②">(2)</a>
-    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports③">5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>
-    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports④">7.1. Registering a New Credential</a>
-    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports⑤">7.2. Verifying an Authentication Assertion</a> <a href="#ref-for-dom-authenticatorattestationresponse-gettransports⑥">(2)</a>
+    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports">5.1. PublicKeyCredential Interface</a>
+    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports①">5.2.1. Information About Public Key Credential (interface AuthenticatorAttestationResponse)</a>
+    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports②">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-dom-authenticatorattestationresponse-gettransports③">(2)</a>
+    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports④">5.8.4. Authenticator Transport Enumeration (enum AuthenticatorTransport)</a>
+    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports⑤">7.1. Registering a New Credential</a>
+    <li><a href="#ref-for-dom-authenticatorattestationresponse-gettransports⑥">7.2. Verifying an Authentication Assertion</a> <a href="#ref-for-dom-authenticatorattestationresponse-gettransports⑦">(2)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-authenticatorattestationresponse-getauthenticatordata">
@@ -10978,8 +11459,9 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
   <aside class="dfn-panel" data-for="dictdef-publickeycredentialparameters">
    <b><a href="#dictdef-publickeycredentialparameters">#dictdef-publickeycredentialparameters</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-dictdef-publickeycredentialparameters">5.3. Parameters for Credential Generation (dictionary PublicKeyCredentialParameters)</a> <a href="#ref-for-dictdef-publickeycredentialparameters①">(2)</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialparameters②">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-dictdef-publickeycredentialparameters③">(2)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialparameters">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialparameters①">5.3. Parameters for Credential Generation (dictionary PublicKeyCredentialParameters)</a> <a href="#ref-for-dictdef-publickeycredentialparameters②">(2)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialparameters③">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-dictdef-publickeycredentialparameters④">(2)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-publickeycredentialparameters-type">
@@ -11002,11 +11484,12 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <ul>
     <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions">5.1.1. CredentialCreationOptions Dictionary Extension</a>
     <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions①">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions②">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions③">5.8.1.2. Limited Verification Algorithm</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions④">7. WebAuthn Relying Party Operations</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions⑤">7.1. Registering a New Credential</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions⑥">13.4.3. Cryptographic Challenges</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions②">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a> <a href="#ref-for-dictdef-publickeycredentialcreationoptions③">(2)</a> <a href="#ref-for-dictdef-publickeycredentialcreationoptions④">(3)</a> <a href="#ref-for-dictdef-publickeycredentialcreationoptions⑤">(4)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions⑥">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions⑦">5.8.1.2. Limited Verification Algorithm</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions⑧">7. WebAuthn Relying Party Operations</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions⑨">7.1. Registering a New Credential</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialcreationoptions①⓪">13.4.3. Cryptographic Challenges</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-publickeycredentialcreationoptions-rp">
@@ -11109,10 +11592,11 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
   <aside class="dfn-panel" data-for="dictdef-publickeycredentialrpentity">
    <b><a href="#dictdef-publickeycredentialrpentity">#dictdef-publickeycredentialrpentity</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-dictdef-publickeycredentialrpentity">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-dictdef-publickeycredentialrpentity①">(2)</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrpentity②">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrpentity③">5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)</a> <a href="#ref-for-dictdef-publickeycredentialrpentity④">(2)</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrpentity⑤">6.3.2. The authenticatorMakeCredential Operation</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrpentity">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrpentity①">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-dictdef-publickeycredentialrpentity②">(2)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrpentity③">5.4.1. Public Key Entity Description (dictionary PublicKeyCredentialEntity)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrpentity④">5.4.2. Relying Party Parameters for Credential Generation (dictionary PublicKeyCredentialRpEntity)</a> <a href="#ref-for-dictdef-publickeycredentialrpentity⑤">(2)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrpentity⑥">6.3.2. The authenticatorMakeCredential Operation</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-publickeycredentialrpentity-id">
@@ -11162,8 +11646,9 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
   <aside class="dfn-panel" data-for="dictdef-authenticatorselectioncriteria">
    <b><a href="#dictdef-authenticatorselectioncriteria">#dictdef-authenticatorselectioncriteria</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-dictdef-authenticatorselectioncriteria">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-dictdef-authenticatorselectioncriteria①">(2)</a>
-    <li><a href="#ref-for-dictdef-authenticatorselectioncriteria②">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a> <a href="#ref-for-dictdef-authenticatorselectioncriteria③">(2)</a>
+    <li><a href="#ref-for-dictdef-authenticatorselectioncriteria">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-dictdef-authenticatorselectioncriteria①">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a> <a href="#ref-for-dictdef-authenticatorselectioncriteria②">(2)</a>
+    <li><a href="#ref-for-dictdef-authenticatorselectioncriteria③">5.4.4. Authenticator Selection Criteria (dictionary AuthenticatorSelectionCriteria)</a> <a href="#ref-for-dictdef-authenticatorselectioncriteria④">(2)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-authenticatorselectioncriteria-authenticatorattachment">
@@ -11308,12 +11793,13 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <ul>
     <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions">5.1.2. CredentialRequestOptions Dictionary Extension</a>
     <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions①">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions②">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-dictdef-publickeycredentialrequestoptions③">(2)</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions④">5.8.1.2. Limited Verification Algorithm</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions⑤">7. WebAuthn Relying Party Operations</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions⑥">7.2. Verifying an Authentication Assertion</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions⑦">13.4.3. Cryptographic Challenges</a>
-    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions⑧">14.6.2. Username Enumeration</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions②">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a> <a href="#ref-for-dictdef-publickeycredentialrequestoptions③">(2)</a> <a href="#ref-for-dictdef-publickeycredentialrequestoptions④">(3)</a> <a href="#ref-for-dictdef-publickeycredentialrequestoptions⑤">(4)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions⑥">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a> <a href="#ref-for-dictdef-publickeycredentialrequestoptions⑦">(2)</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions⑧">5.8.1.2. Limited Verification Algorithm</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions⑨">7. WebAuthn Relying Party Operations</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions①⓪">7.2. Verifying an Authentication Assertion</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions①①">13.4.3. Cryptographic Challenges</a>
+    <li><a href="#ref-for-dictdef-publickeycredentialrequestoptions①②">14.6.2. Username Enumeration</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="dom-publickeycredentialrequestoptions-challenge">
@@ -11602,12 +12088,11 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
    <b><a href="#dom-publickeycredentialdescriptor-transports">#dom-publickeycredentialdescriptor-transports</a></b><b>Referenced in:</b>
    <ul>
     <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports">2.1.1. Enumerations as DOMString types</a>
-    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports①">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-dom-publickeycredentialdescriptor-transports②">(2)</a> <a href="#ref-for-dom-publickeycredentialdescriptor-transports③">(3)</a>
-    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports④">5.1.4.1. PublicKeyCredential’s [[DiscoverFromExternalSource]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-dom-publickeycredentialdescriptor-transports⑤">(2)</a> <a href="#ref-for-dom-publickeycredentialdescriptor-transports⑥">(3)</a> <a href="#ref-for-dom-publickeycredentialdescriptor-transports⑦">(4)</a>
-    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports⑧">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a>
-    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports⑨">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-dom-publickeycredentialdescriptor-transports①⓪">(2)</a>
-    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports①①">7.1. Registering a New Credential</a>
-    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports①②">7.2. Verifying an Authentication Assertion</a>
+    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports①">5.1.3. Create a New Credential - PublicKeyCredential’s [[Create]](origin, options, sameOriginWithAncestors) Method</a> <a href="#ref-for-dom-publickeycredentialdescriptor-transports②">(2)</a>
+    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports③">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a>
+    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports④">5.8.3. Credential Descriptor (dictionary PublicKeyCredentialDescriptor)</a> <a href="#ref-for-dom-publickeycredentialdescriptor-transports⑤">(2)</a>
+    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports⑥">7.1. Registering a New Credential</a>
+    <li><a href="#ref-for-dom-publickeycredentialdescriptor-transports⑦">7.2. Verifying an Authentication Assertion</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="enumdef-authenticatortransport">
@@ -12458,15 +12943,17 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
   <aside class="dfn-panel" data-for="client-extension-input">
    <b><a href="#client-extension-input">#client-extension-input</a></b><b>Referenced in:</b>
    <ul>
-    <li><a href="#ref-for-client-extension-input">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a>
-    <li><a href="#ref-for-client-extension-input①">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a>
-    <li><a href="#ref-for-client-extension-input②">5.7.1. Authentication Extensions Client Inputs (dictionary AuthenticationExtensionsClientInputs)</a>
-    <li><a href="#ref-for-client-extension-input③">7.1. Registering a New Credential</a>
-    <li><a href="#ref-for-client-extension-input④">7.2. Verifying an Authentication Assertion</a>
-    <li><a href="#ref-for-client-extension-input⑤">9. WebAuthn Extensions</a> <a href="#ref-for-client-extension-input⑥">(2)</a>
-    <li><a href="#ref-for-client-extension-input⑦">9.2. Defining Extensions</a>
-    <li><a href="#ref-for-client-extension-input⑧">9.3. Extending Request Parameters</a> <a href="#ref-for-client-extension-input⑨">(2)</a> <a href="#ref-for-client-extension-input①⓪">(3)</a> <a href="#ref-for-client-extension-input①①">(4)</a> <a href="#ref-for-client-extension-input①②">(5)</a> <a href="#ref-for-client-extension-input①③">(6)</a>
-    <li><a href="#ref-for-client-extension-input①④">9.4. Client Extension Processing</a> <a href="#ref-for-client-extension-input①⑤">(2)</a> <a href="#ref-for-client-extension-input①⑥">(3)</a> <a href="#ref-for-client-extension-input①⑦">(4)</a>
+    <li><a href="#ref-for-client-extension-input">5.1.8. Deserialize Registration ceremony options - PublicKeyCredential’s parseCreationOptionsFromJSON() Method</a>
+    <li><a href="#ref-for-client-extension-input①">5.1.9. Deserialize Authentication ceremony options - PublicKeyCredential’s parseRequestOptionsFromJSON() Methods</a>
+    <li><a href="#ref-for-client-extension-input②">5.4. Options for Credential Creation (dictionary PublicKeyCredentialCreationOptions)</a>
+    <li><a href="#ref-for-client-extension-input③">5.5. Options for Assertion Generation (dictionary PublicKeyCredentialRequestOptions)</a>
+    <li><a href="#ref-for-client-extension-input④">5.7.1. Authentication Extensions Client Inputs (dictionary AuthenticationExtensionsClientInputs)</a>
+    <li><a href="#ref-for-client-extension-input⑤">7.1. Registering a New Credential</a>
+    <li><a href="#ref-for-client-extension-input⑥">7.2. Verifying an Authentication Assertion</a>
+    <li><a href="#ref-for-client-extension-input⑦">9. WebAuthn Extensions</a> <a href="#ref-for-client-extension-input⑧">(2)</a>
+    <li><a href="#ref-for-client-extension-input⑨">9.2. Defining Extensions</a>
+    <li><a href="#ref-for-client-extension-input①⓪">9.3. Extending Request Parameters</a> <a href="#ref-for-client-extension-input①①">(2)</a> <a href="#ref-for-client-extension-input①②">(3)</a> <a href="#ref-for-client-extension-input①③">(4)</a> <a href="#ref-for-client-extension-input①④">(5)</a> <a href="#ref-for-client-extension-input①⑤">(6)</a>
+    <li><a href="#ref-for-client-extension-input①⑥">9.4. Client Extension Processing</a> <a href="#ref-for-client-extension-input①⑦">(2)</a> <a href="#ref-for-client-extension-input①⑧">(3)</a> <a href="#ref-for-client-extension-input①⑨">(4)</a>
    </ul>
   </aside>
   <aside class="dfn-panel" data-for="authenticator-extension-input">