From 3f949bee6b8353e0e130cb42cc9edd6019ab2834 Mon Sep 17 00:00:00 2001
From: Mason Freed <masonf@chromium.org>
Date: Mon, 7 Jun 2021 11:11:59 -0700
Subject: [PATCH 1/8] Make text/plugin/media/ua-inline no-quirks documents

---
 source | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/source b/source
index a92a00a0afb..470fa4d53bf 100644
--- a/source
+++ b/source
@@ -86855,6 +86855,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to "no-quirks".</p></li>
+
    <li><p>Create an <span>HTML parser</span> and associate it with the <var>document</var>. Act as
    if the tokenizer had emitted a start tag token with the tag name "pre" followed by a single
    U+000A LINE FEED (LF) character<!-- to get eaten, so that a leading LF in the text/plain stream
@@ -86931,6 +86933,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to "no-quirks".</p></li>
+
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
 
    <li><p>Append a <code>head</code> element to the <code>html</code> element.</p></li>
@@ -86992,6 +86996,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParmas</var>.</p></li>
 
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to "no-quirks".</p></li>
+
    <li><p>Mark <var>document</var> as being a <dfn>plugin document</dfn></p></li>
 
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
@@ -87061,6 +87067,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", "<code data-x="">text/html</code>", and
    <var>navigationParams</var>.</p></li>
 
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to "no-quirks".</p></li>
+
    <li><p>Either associate <var>document</var> with a custom rendering that is not rendered using
    the normal <code>Document</code> rendering rules, or mutate <var>document</var> until it
    represents the content the user agent wants to render.</p>

From 99f3cc4b480af56a615a01956a39c6c5886995ca Mon Sep 17 00:00:00 2001
From: Mason Freed <masonf@chromium.org>
Date: Mon, 7 Jun 2021 11:42:01 -0700
Subject: [PATCH 2/8] Add links to "no-quirks"

---
 source | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/source b/source
index 470fa4d53bf..ae2c6be7ce8 100644
--- a/source
+++ b/source
@@ -86855,7 +86855,7 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to "no-quirks".</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Create an <span>HTML parser</span> and associate it with the <var>document</var>. Act as
    if the tokenizer had emitted a start tag token with the tag name "pre" followed by a single
@@ -86933,7 +86933,7 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to "no-quirks".</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
 
@@ -86996,7 +86996,7 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParmas</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to "no-quirks".</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Mark <var>document</var> as being a <dfn>plugin document</dfn></p></li>
 
@@ -87067,7 +87067,7 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", "<code data-x="">text/html</code>", and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to "no-quirks".</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Either associate <var>document</var> with a custom rendering that is not rendered using
    the normal <code>Document</code> rendering rules, or mutate <var>document</var> until it

From 04c154e5519214c031b44782d4d40fa7fa912502 Mon Sep 17 00:00:00 2001
From: Mason Freed <masonf@chromium.org>
Date: Mon, 7 Jun 2021 11:43:02 -0700
Subject: [PATCH 3/8] Line wrapping

---
 source | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/source b/source
index ae2c6be7ce8..95ae3c1e717 100644
--- a/source
+++ b/source
@@ -86855,7 +86855,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to
+   <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Create an <span>HTML parser</span> and associate it with the <var>document</var>. Act as
    if the tokenizer had emitted a start tag token with the tag name "pre" followed by a single
@@ -86933,7 +86934,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to
+   <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
 
@@ -86996,7 +86998,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParmas</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to
+   <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Mark <var>document</var> as being a <dfn>plugin document</dfn></p></li>
 
@@ -87067,7 +87070,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", "<code data-x="">text/html</code>", and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to
+   <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Either associate <var>document</var> with a custom rendering that is not rendered using
    the normal <code>Document</code> rendering rules, or mutate <var>document</var> until it

From 2a021c82a635257de26d8266cbcfc9f99a77497b Mon Sep 17 00:00:00 2001
From: Mason Freed <masonf@chromium.org>
Date: Wed, 9 Jun 2021 14:45:06 -0700
Subject: [PATCH 4/8] Change impl to use new mode locked flag

---
 source | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/source b/source
index 95ae3c1e717..c454ad4a3c5 100644
--- a/source
+++ b/source
@@ -3020,8 +3020,11 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
             <dfn data-x="event listener callback" data-x-href="https://dom.spec.whatwg.org/#event-listener-callback">callback</dfn></li>
 
      <li>The <dfn data-x="document's character encoding" data-x-href="https://dom.spec.whatwg.org/#concept-document-encoding">encoding</dfn> (herein the <i>character encoding</i>),
-             <dfn data-x="concept-document-mode" data-x-href="https://dom.spec.whatwg.org/#concept-document-mode">mode</dfn>, and
+             <dfn data-x="concept-document-mode" data-x-href="https://dom.spec.whatwg.org/#concept-document-mode">mode</dfn>,
+             <dfn data-x="concept-document-mode-locked" data-x-href="https://dom.spec.whatwg.org/#concept-document-mode-locked">mode locked</dfn>, and
              <dfn data-x="concept-document-content-type" data-x-href="https://dom.spec.whatwg.org/#concept-document-content-type">content type</dfn> of a <code>Document</code></li>
+     <li>The <dfn data-x="concept-document-set-the-mode" data-x-href="https://dom.spec.whatwg.org/#concept-document-set-the-mode">set the mode</dfn> algorithm for a <code>Document</code></li>
+
      <li>The distinction between <dfn data-x-href="https://dom.spec.whatwg.org/#xml-document">XML documents</dfn> and
                                  <dfn data-x-href="https://dom.spec.whatwg.org/#html-document">HTML documents</dfn></li>
      <li>The terms <dfn data-x-href="https://dom.spec.whatwg.org/#concept-document-quirks">quirks mode</dfn>,
@@ -86855,8 +86858,11 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to
-   <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Invoke the <span data-x="concept-document-set-the-mode">set the mode</span> algorithm
+   on <var>document</var>, with <var>new mode</var> set to <code data-x="">no-quirks</code>.</p></li>
+
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode-locked">mode locked</span>
+   flag to <code data-x="">true</code>.</p></li>
 
    <li><p>Create an <span>HTML parser</span> and associate it with the <var>document</var>. Act as
    if the tokenizer had emitted a start tag token with the tag name "pre" followed by a single
@@ -86934,8 +86940,11 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to
-   <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Invoke the <span data-x="concept-document-set-the-mode">set the mode</span> algorithm
+   on <var>document</var>, with <var>new mode</var> set to <code data-x="">no-quirks</code>.</p></li>
+
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode-locked">mode locked</span>
+   flag to <code data-x="">true</code>.</p></li>
 
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
 
@@ -86998,8 +87007,11 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParmas</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to
-   <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Invoke the <span data-x="concept-document-set-the-mode">set the mode</span> algorithm
+   on <var>document</var>, with <var>new mode</var> set to <code data-x="">no-quirks</code>.</p></li>
+
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode-locked">mode locked</span>
+   flag to <code data-x="">true</code>.</p></li>
 
    <li><p>Mark <var>document</var> as being a <dfn>plugin document</dfn></p></li>
 
@@ -87070,8 +87082,11 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", "<code data-x="">text/html</code>", and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span> to
-   <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Invoke the <span data-x="concept-document-set-the-mode">set the mode</span> algorithm
+   on <var>document</var>, with <var>new mode</var> set to <code data-x="">no-quirks</code>.</p></li>
+
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode-locked">mode locked</span>
+   flag to <code data-x="">true</code>.</p></li>
 
    <li><p>Either associate <var>document</var> with a custom rendering that is not rendered using
    the normal <code>Document</code> rendering rules, or mutate <var>document</var> until it

From 5a14739fefbfdc0ba11e99b39abf63513dc89cde Mon Sep 17 00:00:00 2001
From: Mason Freed <masonf@chromium.org>
Date: Wed, 9 Jun 2021 15:27:46 -0700
Subject: [PATCH 5/8] Update parser rules

---
 source | 48 +++++++++++++++++++++++++++++-------------------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/source b/source
index c454ad4a3c5..e8bfee9ae85 100644
--- a/source
+++ b/source
@@ -94146,7 +94146,8 @@ document.body.appendChild(frame)</code></pre>
    <li><p>If <var>document</var>'s <span>iframe load in progress</span> flag is set, then set
    <var>document</var>'s <span>mute iframe load</span> flag.</p></li>
 
-   <li><p>Set <var>document</var> to <span>no-quirks mode</span>.</p></li>
+   <li><p>Set <var>document</var> to <span>no-quirks mode</span>, and set <var>document</var>'s
+   <span data-x="concept-document-mode-locked">mode locked</span> flag to false.</p></li>
 
    <li><p>Create a new <span>HTML parser</span> and associate it with <var>document</var>. This is a
    <dfn>script-created parser</dfn> (meaning that it can be closed by the <code
@@ -104103,16 +104104,17 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> in the
      <span data-x="syntax-doctype">DOCTYPE</span> public identifier (e.g., <code
      data-x="">&lt;!DOCTYPE html PUBLIC "foo></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, the parser sets the <code>Document</code> to <span>quirks
-     mode</span>.</p>
+     placed as a document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-abrupt-doctype-system-identifier">abrupt-doctype-system-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> in the
      <span data-x="syntax-doctype">DOCTYPE</span> system identifier (e.g., <code
      data-x="">&lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "foo></code>). In such a case,
-     if the DOCTYPE is correctly placed as a document preamble, the parser sets the
-     <code>Document</code> to <span>quirks mode</span>.</p>
+     if the DOCTYPE is correctly placed as a document preamble, the parser invokes the
+     <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-absence-of-digits-in-numeric-character-reference">absence-of-digits-in-numeric-character-reference</dfn>
@@ -104194,7 +104196,8 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><dfn data-x="parse-error-eof-in-doctype">eof-in-doctype</dfn>
      <td><p>This error occurs if the parser encounters the end of the input stream in a <span
      data-x="syntax-doctype">DOCTYPE</span>. In such a case, if the DOCTYPE is correctly placed as a
-     document preamble, the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-eof-in-script-html-comment-like-text">eof-in-script-html-comment-like-text</dfn>
@@ -104243,7 +104246,8 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      than "<code data-x="">PUBLIC</code>" and "<code data-x="">SYSTEM</code>" keywords after a <span
      data-x="syntax-doctype">DOCTYPE</span> name. In such a case, the parser ignores any following
      public or system identifiers, and if the DOCTYPE is correctly placed as a document preamble,
-     sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-invalid-first-character-of-tag-name">invalid-first-character-of-tag-name</dfn>
@@ -104281,23 +104285,24 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><p>This error occurs if the parser encounters a <span
      data-x="syntax-doctype">DOCTYPE</span> that is missing a name (e.g., <code
      data-x="">&lt;!DOCTYPE></code>). In such a case, if the DOCTYPE is correctly placed as a
-     document preamble, the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-doctype-public-identifier">missing-doctype-public-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> where
      start of the <span data-x="syntax-doctype">DOCTYPE</span> public identifier is expected (e.g.,
      <code data-x="">&lt;!DOCTYPE html PUBLIC ></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, the parser sets the <code>Document</code> to <span>quirks
-     mode</span>.</p>
+     placed as a document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-doctype-system-identifier">missing-doctype-system-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> where
      start of the <span data-x="syntax-doctype">DOCTYPE</span> system identifier is expected (e.g.,
      <code data-x="">&lt;!DOCTYPE html SYSTEM ></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, the parser sets the <code>Document</code> to <span>quirks
-     mode</span>.</p>
+     placed as a document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-end-tag-name">missing-end-tag-name</dfn>
@@ -104312,7 +104317,8 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      data-x="syntax-doctype">DOCTYPE</span> public identifier that is not preceded by a quote (e.g.,
      <code data-x="">&lt;!DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01//EN"></code>). In such a case,
      the parser ignores the public identifier, and if the DOCTYPE is correctly placed as a document
-     preamble, sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     preamble, invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-quote-before-doctype-system-identifier">missing-quote-before-doctype-system-identifier</dfn>
@@ -104321,7 +104327,8 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <code data-x="">&lt;!DOCTYPE html SYSTEM
      http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"></code>). In such a case, the parser
      ignores the system identifier, and if the DOCTYPE is correctly placed as a document preamble,
-     sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
+     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-semicolon-after-character-reference">missing-semicolon-after-character-reference</dfn>
@@ -109173,8 +109180,9 @@ document.body.appendChild(text);
 
     <p id="quirks-mode-doctypes">Then, if the document is <em>not</em> <span>an <code>iframe</code>
     <code data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the DOCTYPE token matches
-    one of the conditions in the following list, then set the <code>Document</code> to <span>quirks
-    mode</span>:</p>
+    one of the conditions in the following list, then invoke the
+    <span data-x="concept-document-set-the-mode">set the mode</span> algorithm on the document
+    with <var>new mode</var> set to <code data-x="">quirks</code>:</p>
 
     <ul class="brief">
      <li> The <i data-x="force-quirks flag">force-quirks flag</i> is set to <i>on</i>. </li>
@@ -109244,8 +109252,9 @@ document.body.appendChild(text);
 
     <p>Otherwise, if the document is <em>not</em> <span>an <code>iframe</code> <code
     data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the DOCTYPE token matches one of
-    the conditions in the following list, then set the <code>Document</code> to <span>limited-quirks
-    mode</span>:</p>
+    the conditions in the following list, then invoke the
+    <span data-x="concept-document-set-the-mode">set the mode</span> algorithm on the document
+    with <var>new mode</var> set to <code data-x="">limited-quirks</code>:</p>
 
     <ul class="brief">
      <li> The public identifier starts with: "<code data-x="">-//W3C//DTD XHTML 1.0 Frameset//</code>" </li>
@@ -109267,7 +109276,8 @@ document.body.appendChild(text);
    <dd>
     <p>If the document is <em>not</em> <span>an <code>iframe</code> <code
     data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, then this is a <span>parse
-    error</span>; set the <code>Document</code> to <span>quirks mode</span>.</p>
+    error</span>; invoke the <span data-x="concept-document-set-the-mode">set the mode</span>
+    algorithm on the document with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
 
     <p>In any case, switch the <span>insertion mode</span> to "<span data-x="insertion mode: before
     html">before html</span>", then reprocess the token.</p>

From 1141771e55b371c87fa6b3c90b61ca4767a8d4bd Mon Sep 17 00:00:00 2001
From: Mason Freed <masonf@chromium.org>
Date: Tue, 22 Jun 2021 13:10:31 -0700
Subject: [PATCH 6/8] Local-to-html implementation

---
 source | 96 ++++++++++++++++++++++------------------------------------
 1 file changed, 37 insertions(+), 59 deletions(-)

diff --git a/source b/source
index e8bfee9ae85..7b088d46606 100644
--- a/source
+++ b/source
@@ -3020,11 +3020,8 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
             <dfn data-x="event listener callback" data-x-href="https://dom.spec.whatwg.org/#event-listener-callback">callback</dfn></li>
 
      <li>The <dfn data-x="document's character encoding" data-x-href="https://dom.spec.whatwg.org/#concept-document-encoding">encoding</dfn> (herein the <i>character encoding</i>),
-             <dfn data-x="concept-document-mode" data-x-href="https://dom.spec.whatwg.org/#concept-document-mode">mode</dfn>,
-             <dfn data-x="concept-document-mode-locked" data-x-href="https://dom.spec.whatwg.org/#concept-document-mode-locked">mode locked</dfn>, and
+             <dfn data-x="concept-document-mode" data-x-href="https://dom.spec.whatwg.org/#concept-document-mode">mode</dfn>, and
              <dfn data-x="concept-document-content-type" data-x-href="https://dom.spec.whatwg.org/#concept-document-content-type">content type</dfn> of a <code>Document</code></li>
-     <li>The <dfn data-x="concept-document-set-the-mode" data-x-href="https://dom.spec.whatwg.org/#concept-document-set-the-mode">set the mode</dfn> algorithm for a <code>Document</code></li>
-
      <li>The distinction between <dfn data-x-href="https://dom.spec.whatwg.org/#xml-document">XML documents</dfn> and
                                  <dfn data-x-href="https://dom.spec.whatwg.org/#html-document">HTML documents</dfn></li>
      <li>The terms <dfn data-x-href="https://dom.spec.whatwg.org/#concept-document-quirks">quirks mode</dfn>,
@@ -86858,11 +86855,10 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Invoke the <span data-x="concept-document-set-the-mode">set the mode</span> algorithm
-   on <var>document</var>, with <var>new mode</var> set to <code data-x="">no-quirks</code>.</p></li>
+   <li><p>Set the <var>document</var>'s <span>parser cannot change the mode flag</span> to true.</p></li>
 
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode-locked">mode locked</span>
-   flag to <code data-x="">true</code>.</p></li>
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span>
+   flag to <code data-x="">no-quirks</code>.</p></li>
 
    <li><p>Create an <span>HTML parser</span> and associate it with the <var>document</var>. Act as
    if the tokenizer had emitted a start tag token with the tag name "pre" followed by a single
@@ -86940,12 +86936,6 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Invoke the <span data-x="concept-document-set-the-mode">set the mode</span> algorithm
-   on <var>document</var>, with <var>new mode</var> set to <code data-x="">no-quirks</code>.</p></li>
-
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode-locked">mode locked</span>
-   flag to <code data-x="">true</code>.</p></li>
-
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
 
    <li><p>Append a <code>head</code> element to the <code>html</code> element.</p></li>
@@ -87007,12 +86997,6 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParmas</var>.</p></li>
 
-   <li><p>Invoke the <span data-x="concept-document-set-the-mode">set the mode</span> algorithm
-   on <var>document</var>, with <var>new mode</var> set to <code data-x="">no-quirks</code>.</p></li>
-
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode-locked">mode locked</span>
-   flag to <code data-x="">true</code>.</p></li>
-
    <li><p>Mark <var>document</var> as being a <dfn>plugin document</dfn></p></li>
 
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
@@ -87082,12 +87066,6 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", "<code data-x="">text/html</code>", and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Invoke the <span data-x="concept-document-set-the-mode">set the mode</span> algorithm
-   on <var>document</var>, with <var>new mode</var> set to <code data-x="">no-quirks</code>.</p></li>
-
-   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode-locked">mode locked</span>
-   flag to <code data-x="">true</code>.</p></li>
-
    <li><p>Either associate <var>document</var> with a custom rendering that is not rendered using
    the normal <code>Document</code> rendering rules, or mutate <var>document</var> until it
    represents the content the user agent wants to render.</p>
@@ -94146,8 +94124,7 @@ document.body.appendChild(frame)</code></pre>
    <li><p>If <var>document</var>'s <span>iframe load in progress</span> flag is set, then set
    <var>document</var>'s <span>mute iframe load</span> flag.</p></li>
 
-   <li><p>Set <var>document</var> to <span>no-quirks mode</span>, and set <var>document</var>'s
-   <span data-x="concept-document-mode-locked">mode locked</span> flag to false.</p></li>
+   <li><p>Set <var>document</var> to <span>no-quirks mode</span>.</p></li>
 
    <li><p>Create a new <span>HTML parser</span> and associate it with <var>document</var>. This is a
    <dfn>script-created parser</dfn> (meaning that it can be closed by the <code
@@ -104104,17 +104081,16 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> in the
      <span data-x="syntax-doctype">DOCTYPE</span> public identifier (e.g., <code
      data-x="">&lt;!DOCTYPE html PUBLIC "foo></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+     placed as a document preamble, and if the <span>parser cannot change the mode flag</span> is false,
+     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-abrupt-doctype-system-identifier">abrupt-doctype-system-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> in the
      <span data-x="syntax-doctype">DOCTYPE</span> system identifier (e.g., <code
      data-x="">&lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "foo></code>). In such a case,
-     if the DOCTYPE is correctly placed as a document preamble, the parser invokes the
-     <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+     if the DOCTYPE is correctly placed as a document preamble, and if the <span>parser cannot change
+     the mode flag</span> is false, the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-absence-of-digits-in-numeric-character-reference">absence-of-digits-in-numeric-character-reference</dfn>
@@ -104196,8 +104172,8 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><dfn data-x="parse-error-eof-in-doctype">eof-in-doctype</dfn>
      <td><p>This error occurs if the parser encounters the end of the input stream in a <span
      data-x="syntax-doctype">DOCTYPE</span>. In such a case, if the DOCTYPE is correctly placed as a
-     document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+     document preamble, and if the <span>parser cannot change the mode flag</span> is false,
+     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-eof-in-script-html-comment-like-text">eof-in-script-html-comment-like-text</dfn>
@@ -104246,8 +104222,8 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      than "<code data-x="">PUBLIC</code>" and "<code data-x="">SYSTEM</code>" keywords after a <span
      data-x="syntax-doctype">DOCTYPE</span> name. In such a case, the parser ignores any following
      public or system identifiers, and if the DOCTYPE is correctly placed as a document preamble,
-     invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+     and if the <span>parser cannot change the mode flag</span> is false, sets the <code>Document</code>
+     to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-invalid-first-character-of-tag-name">invalid-first-character-of-tag-name</dfn>
@@ -104285,24 +104261,23 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><p>This error occurs if the parser encounters a <span
      data-x="syntax-doctype">DOCTYPE</span> that is missing a name (e.g., <code
      data-x="">&lt;!DOCTYPE></code>). In such a case, if the DOCTYPE is correctly placed as a
-     document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+     document preamble, and if the <span>parser cannot change the mode flag</span> is false, the parser
+     sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-doctype-public-identifier">missing-doctype-public-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> where
      start of the <span data-x="syntax-doctype">DOCTYPE</span> public identifier is expected (e.g.,
      <code data-x="">&lt;!DOCTYPE html PUBLIC ></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
-
+     placed as a document preamble, and if the <span>parser cannot change the mode flag</span> is false,
+     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
     <tr>
      <td><dfn data-x="parse-error-missing-doctype-system-identifier">missing-doctype-system-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> where
      start of the <span data-x="syntax-doctype">DOCTYPE</span> system identifier is expected (e.g.,
      <code data-x="">&lt;!DOCTYPE html SYSTEM ></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, the parser invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+     placed as a document preamble, and if the <span>parser cannot change the mode flag</span> is false,
+     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-end-tag-name">missing-end-tag-name</dfn>
@@ -104317,8 +104292,8 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      data-x="syntax-doctype">DOCTYPE</span> public identifier that is not preceded by a quote (e.g.,
      <code data-x="">&lt;!DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01//EN"></code>). In such a case,
      the parser ignores the public identifier, and if the DOCTYPE is correctly placed as a document
-     preamble, invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+     preamble, and if the <span>parser cannot change the mode flag</span> is false,
+     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-quote-before-doctype-system-identifier">missing-quote-before-doctype-system-identifier</dfn>
@@ -104327,8 +104302,8 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <code data-x="">&lt;!DOCTYPE html SYSTEM
      http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"></code>). In such a case, the parser
      ignores the system identifier, and if the DOCTYPE is correctly placed as a document preamble,
-     invokes the <span data-x="concept-document-set-the-mode">set the mode</span>
-     algorithm on <code>Document</code> with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+     and if the <span>parser cannot change the mode flag</span> is false,
+     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-semicolon-after-character-reference">missing-semicolon-after-character-reference</dfn>
@@ -109137,10 +109112,13 @@ document.body.appendChild(text);
   <span>stack of open elements</span>.</p>
 
 
+  <h6>The <span>parser cannot change the mode flag</span></h6>
 
-  <h5 id="parsing-main-inhtml">The rules for parsing tokens in HTML content</h5>
+  <p>A <code>Document</code> object has an associated <dfn for="Document">parser cannot change the mode flag</dfn> (a boolean). It is initially false.</p>
 
 
+  <h5 id="parsing-main-inhtml">The rules for parsing tokens in HTML content</h5>
+
   <h6>The "<dfn data-x="insertion mode: initial">initial</dfn>" insertion mode</h6>
 
   <p>When the user agent is to apply the rules for the "<span data-x="insertion mode:
@@ -109179,10 +109157,10 @@ document.body.appendChild(text);
     <code>Document</code> object.</p>
 
     <p id="quirks-mode-doctypes">Then, if the document is <em>not</em> <span>an <code>iframe</code>
-    <code data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the DOCTYPE token matches
-    one of the conditions in the following list, then invoke the
-    <span data-x="concept-document-set-the-mode">set the mode</span> algorithm on the document
-    with <var>new mode</var> set to <code data-x="">quirks</code>:</p>
+    <code data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the <span>parser cannot change
+    the mode flag</span> is false, and the DOCTYPE token matches
+    one of the conditions in the following list, then set the <code>Document</code> to <span>quirks
+    mode</span>:</p>
 
     <ul class="brief">
      <li> The <i data-x="force-quirks flag">force-quirks flag</i> is set to <i>on</i>. </li>
@@ -109251,10 +109229,10 @@ document.body.appendChild(text);
     </ul>
 
     <p>Otherwise, if the document is <em>not</em> <span>an <code>iframe</code> <code
-    data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the DOCTYPE token matches one of
-    the conditions in the following list, then invoke the
-    <span data-x="concept-document-set-the-mode">set the mode</span> algorithm on the document
-    with <var>new mode</var> set to <code data-x="">limited-quirks</code>:</p>
+    data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the <span>parser cannot change
+    the mode flag</span> is false, and the DOCTYPE token matches one of
+    the conditions in the following list, then then set the <code>Document</code> to
+    <span>limited-quirks mode</span>:</p>
 
     <ul class="brief">
      <li> The public identifier starts with: "<code data-x="">-//W3C//DTD XHTML 1.0 Frameset//</code>" </li>
@@ -109276,8 +109254,8 @@ document.body.appendChild(text);
    <dd>
     <p>If the document is <em>not</em> <span>an <code>iframe</code> <code
     data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, then this is a <span>parse
-    error</span>; invoke the <span data-x="concept-document-set-the-mode">set the mode</span>
-    algorithm on the document with <var>new mode</var> set to <code data-x="">quirks</code>.</p>
+    error</span>; if the <span>parser cannot change the mode flag</span> is false,
+    set the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <p>In any case, switch the <span>insertion mode</span> to "<span data-x="insertion mode: before
     html">before html</span>", then reprocess the token.</p>

From 925569bb324f092f0020cb2dab6c63de445d1aeb Mon Sep 17 00:00:00 2001
From: Mason Freed <masonf@chromium.org>
Date: Tue, 22 Jun 2021 15:54:13 -0700
Subject: [PATCH 7/8] Address all @domenic comments

---
 source | 47 ++++++++++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/source b/source
index 7b088d46606..0aabb97693f 100644
--- a/source
+++ b/source
@@ -86858,7 +86858,7 @@ new PaymentRequest(&hellip;); // Allowed to use
    <li><p>Set the <var>document</var>'s <span>parser cannot change the mode flag</span> to true.</p></li>
 
    <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span>
-   flag to <code data-x="">no-quirks</code>.</p></li>
+   to "<code data-x="">no-quirks</code>".</p></li>
 
    <li><p>Create an <span>HTML parser</span> and associate it with the <var>document</var>. Act as
    if the tokenizer had emitted a start tag token with the tag name "pre" followed by a single
@@ -86936,6 +86936,9 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span>
+   to "<code data-x="">no-quirks</code>".</p></li>
+
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
 
    <li><p>Append a <code>head</code> element to the <code>html</code> element.</p></li>
@@ -86997,6 +87000,9 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParmas</var>.</p></li>
 
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span>
+   to "<code data-x="">no-quirks</code>".</p></li>
+
    <li><p>Mark <var>document</var> as being a <dfn>plugin document</dfn></p></li>
 
    <li><p>Append an <code>html</code> element to <var>document</var>.</p></li>
@@ -87066,6 +87072,9 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", "<code data-x="">text/html</code>", and
    <var>navigationParams</var>.</p></li>
 
+   <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span>
+   to "<code data-x="">no-quirks</code>".</p></li>
+
    <li><p>Either associate <var>document</var> with a custom rendering that is not rendered using
    the normal <code>Document</code> rendering rules, or mutate <var>document</var> until it
    represents the content the user agent wants to render.</p>
@@ -104081,16 +104090,16 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> in the
      <span data-x="syntax-doctype">DOCTYPE</span> public identifier (e.g., <code
      data-x="">&lt;!DOCTYPE html PUBLIC "foo></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, and if the <span>parser cannot change the mode flag</span> is false,
-     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     placed as a document preamble, the parser sets the <code>Document</code> to <span>quirks
+     mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-abrupt-doctype-system-identifier">abrupt-doctype-system-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> in the
      <span data-x="syntax-doctype">DOCTYPE</span> system identifier (e.g., <code
      data-x="">&lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "foo></code>). In such a case,
-     if the DOCTYPE is correctly placed as a document preamble, and if the <span>parser cannot change
-     the mode flag</span> is false, the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     if the DOCTYPE is correctly placed as a document preamble, the parser sets the
+     <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-absence-of-digits-in-numeric-character-reference">absence-of-digits-in-numeric-character-reference</dfn>
@@ -104172,8 +104181,7 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><dfn data-x="parse-error-eof-in-doctype">eof-in-doctype</dfn>
      <td><p>This error occurs if the parser encounters the end of the input stream in a <span
      data-x="syntax-doctype">DOCTYPE</span>. In such a case, if the DOCTYPE is correctly placed as a
-     document preamble, and if the <span>parser cannot change the mode flag</span> is false,
-     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     document preamble, the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-eof-in-script-html-comment-like-text">eof-in-script-html-comment-like-text</dfn>
@@ -104261,23 +104269,23 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <td><p>This error occurs if the parser encounters a <span
      data-x="syntax-doctype">DOCTYPE</span> that is missing a name (e.g., <code
      data-x="">&lt;!DOCTYPE></code>). In such a case, if the DOCTYPE is correctly placed as a
-     document preamble, and if the <span>parser cannot change the mode flag</span> is false, the parser
-     sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     document preamble, the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-doctype-public-identifier">missing-doctype-public-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> where
      start of the <span data-x="syntax-doctype">DOCTYPE</span> public identifier is expected (e.g.,
      <code data-x="">&lt;!DOCTYPE html PUBLIC ></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, and if the <span>parser cannot change the mode flag</span> is false,
-     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     placed as a document preamble, the parser sets the <code>Document</code> to <span>quirks
+     mode</span>.</p>
+
     <tr>
      <td><dfn data-x="parse-error-missing-doctype-system-identifier">missing-doctype-system-identifier</dfn>
      <td><p>This error occurs if the parser encounters a U+003E (>) <span>code point</span> where
      start of the <span data-x="syntax-doctype">DOCTYPE</span> system identifier is expected (e.g.,
      <code data-x="">&lt;!DOCTYPE html SYSTEM ></code>). In such a case, if the DOCTYPE is correctly
-     placed as a document preamble, and if the <span>parser cannot change the mode flag</span> is false,
-     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     placed as a document preamble, the parser sets the <code>Document</code> to <span>quirks
+     mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-end-tag-name">missing-end-tag-name</dfn>
@@ -104292,8 +104300,7 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      data-x="syntax-doctype">DOCTYPE</span> public identifier that is not preceded by a quote (e.g.,
      <code data-x="">&lt;!DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01//EN"></code>). In such a case,
      the parser ignores the public identifier, and if the DOCTYPE is correctly placed as a document
-     preamble, and if the <span>parser cannot change the mode flag</span> is false,
-     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     preamble, sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-quote-before-doctype-system-identifier">missing-quote-before-doctype-system-identifier</dfn>
@@ -104302,8 +104309,7 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
      <code data-x="">&lt;!DOCTYPE html SYSTEM
      http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"></code>). In such a case, the parser
      ignores the system identifier, and if the DOCTYPE is correctly placed as a document preamble,
-     and if the <span>parser cannot change the mode flag</span> is false,
-     the parser sets the <code>Document</code> to <span>quirks mode</span>.</p>
+     sets the <code>Document</code> to <span>quirks mode</span>.</p>
 
     <tr>
      <td><dfn data-x="parse-error-missing-semicolon-after-character-reference">missing-semicolon-after-character-reference</dfn>
@@ -109112,15 +109118,14 @@ document.body.appendChild(text);
   <span>stack of open elements</span>.</p>
 
 
-  <h6>The <span>parser cannot change the mode flag</span></h6>
-
-  <p>A <code>Document</code> object has an associated <dfn for="Document">parser cannot change the mode flag</dfn> (a boolean). It is initially false.</p>
-
 
   <h5 id="parsing-main-inhtml">The rules for parsing tokens in HTML content</h5>
 
+
   <h6>The "<dfn data-x="insertion mode: initial">initial</dfn>" insertion mode</h6>
 
+  <p>A <code>Document</code> object has an associated <dfn for="Document">parser cannot change the mode flag</dfn> (a boolean). It is initially false.</p>
+
   <p>When the user agent is to apply the rules for the "<span data-x="insertion mode:
   initial">initial</span>" <span>insertion mode</span>, the user agent must handle the token as
   follows:</p>

From 186b1950a67b01e21abaed081c870b9580635de0 Mon Sep 17 00:00:00 2001
From: Domenic Denicola <d@domenic.me>
Date: Wed, 23 Jun 2021 13:23:41 -0400
Subject: [PATCH 8/8] Minor tweaks

---
 source | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/source b/source
index 0aabb97693f..8ab48035a46 100644
--- a/source
+++ b/source
@@ -86855,7 +86855,8 @@ new PaymentRequest(&hellip;); // Allowed to use
    object</span> given "<code data-x="">html</code>", <var>type</var>, and
    <var>navigationParams</var>.</p></li>
 
-   <li><p>Set the <var>document</var>'s <span>parser cannot change the mode flag</span> to true.</p></li>
+   <li><p>Set <var>document</var>'s <span>parser cannot change the mode flag</span> to
+   true.</p></li>
 
    <li><p>Set <var>document</var>'s <span data-x="concept-document-mode">mode</span>
    to "<code data-x="">no-quirks</code>".</p></li>
@@ -109124,7 +109125,8 @@ document.body.appendChild(text);
 
   <h6>The "<dfn data-x="insertion mode: initial">initial</dfn>" insertion mode</h6>
 
-  <p>A <code>Document</code> object has an associated <dfn for="Document">parser cannot change the mode flag</dfn> (a boolean). It is initially false.</p>
+  <p>A <code>Document</code> object has an associated <dfn>parser cannot change the mode flag</dfn>
+  (a boolean). It is initially false.</p>
 
   <p>When the user agent is to apply the rules for the "<span data-x="insertion mode:
   initial">initial</span>" <span>insertion mode</span>, the user agent must handle the token as
@@ -109162,10 +109164,9 @@ document.body.appendChild(text);
     <code>Document</code> object.</p>
 
     <p id="quirks-mode-doctypes">Then, if the document is <em>not</em> <span>an <code>iframe</code>
-    <code data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the <span>parser cannot change
-    the mode flag</span> is false, and the DOCTYPE token matches
-    one of the conditions in the following list, then set the <code>Document</code> to <span>quirks
-    mode</span>:</p>
+    <code data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the <span>parser cannot
+    change the mode flag</span> is false, and the DOCTYPE token matches one of the conditions in the
+    following list, then set the <code>Document</code> to <span>quirks mode</span>:</p>
 
     <ul class="brief">
      <li> The <i data-x="force-quirks flag">force-quirks flag</i> is set to <i>on</i>. </li>
@@ -109235,9 +109236,8 @@ document.body.appendChild(text);
 
     <p>Otherwise, if the document is <em>not</em> <span>an <code>iframe</code> <code
     data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, and the <span>parser cannot change
-    the mode flag</span> is false, and the DOCTYPE token matches one of
-    the conditions in the following list, then then set the <code>Document</code> to
-    <span>limited-quirks mode</span>:</p>
+    the mode flag</span> is false, and the DOCTYPE token matches one of the conditions in the
+    following list, then then set the <code>Document</code> to <span>limited-quirks mode</span>:</p>
 
     <ul class="brief">
      <li> The public identifier starts with: "<code data-x="">-//W3C//DTD XHTML 1.0 Frameset//</code>" </li>
@@ -109259,8 +109259,8 @@ document.body.appendChild(text);
    <dd>
     <p>If the document is <em>not</em> <span>an <code>iframe</code> <code
     data-x="attr-iframe-srcdoc">srcdoc</code> document</span>, then this is a <span>parse
-    error</span>; if the <span>parser cannot change the mode flag</span> is false,
-    set the <code>Document</code> to <span>quirks mode</span>.</p>
+    error</span>; if the <span>parser cannot change the mode flag</span> is false, set the
+    <code>Document</code> to <span>quirks mode</span>.</p>
 
     <p>In any case, switch the <span>insertion mode</span> to "<span data-x="insertion mode: before
     html">before html</span>", then reprocess the token.</p>