Revert determining the source changes

source

@@ -94115,7 +94115,7 @@ interface <dfn interface>BeforeUnloadEvent</dfn> : <span>Event</span> {
 
    <li id="about-blank-origin"><p>Let <var>origin</var> be the result of <span>determining the
    origin</span> given <code>about:blank</code>, <var>sandboxFlags</var>, and
-   <var>creatorOrigin</var>.</p></li>
+   <var>creatorOrigin</var>, and null.</p></li>
 
    <li>
     <p>Let <var>permissionsPolicy</var> be the result of <span>creating a permissions policy</span>
@@ -94282,8 +94282,9 @@ interface <dfn interface>BeforeUnloadEvent</dfn> : <span>Event</span> {
   </ol>
 
   <p>To <dfn data-x="determining the origin">determine the origin</dfn>, given a <span>URL</span>
-  <var>url</var>, a <span>sandboxing flag set</span> <var>sandboxFlags</var>, and an
-  <span>origin</span>-or-null <var>initiatorOrigin</var>:</p>
+  <var>url</var>, a <span>sandboxing flag set</span> <var>sandboxFlags</var>, an
+  <span>origin</span>-or-null <var>sourceOrigin</var>, and an <span>origin</span>-or-null
+  <var>containerOrigin</var>:</p>
 
   <ol>
    <li id="sandboxOrigin"><p>If <var>sandboxFlags</var> has its <span>sandboxed origin browsing
@@ -94297,14 +94298,14 @@ interface <dfn interface>BeforeUnloadEvent</dfn> : <span>Event</span> {
     <p>If <var>url</var> is <code>about:srcdoc</code>, then:</p>
 
     <ol>
-     <li><p><span>Assert</span>: <var>initiatorOrigin</var> is non-null.</p></li>
+     <li><p><span>Assert</span>: <var>containerOrigin</var> is non-null.</p></li>
 
-     <li><p>Return <var>initiatorOrigin</var>.</p></li>
+     <li><p>Return <var>containerOrigin</var>.</p></li>
     </ol>
    </li>
 
    <li><p>If <var>url</var> <span>matches <code>about:blank</code></span> and
-   <var>initiatorOrigin</var> is non-null, then return <var>initiatorOrigin</var>.</p></li>
+   <var>sourceOrigin</var> is non-null, then return <var>sourceOrigin</var>.</p></li>
 
    <li><p>Return <var>url</var>'s <span data-x="concept-url-origin">origin</span>.</p></li>
   </ol>
@@ -96066,8 +96067,8 @@ location.href = '#foo';</code></pre>
 
        <li><p>Let <var>responseOrigin</var> be the result of <span>determining the origin</span>
        given <var>response</var>'s <span data-x="concept-response-url">URL</span>,
-       <var>finalSandboxFlags</var>, and <var>documentState</var>'s <span
-       data-x="document-state-initiator-origin">initiator origin</span>.</p></li>
+       <var>finalSandboxFlags</var>, <var>documentState</var>'s <span
+       data-x="document-state-initiator-origin">initiator origin</span>, and null.</p></li>
 
        <li><p>Let <var>coop</var> be a new <span>cross-origin opener policy</span>.</p></li>
 
@@ -97746,8 +97747,8 @@ location.href = '#foo';</code></pre>
    <li><p>Let <var>responseOrigin</var> be the result of <span>determining the origin</span> given
    <var>response</var>'s <span data-x="concept-response-url">URL</span>,
    <var>targetSnapshotParams</var>'s <span data-x="target-snapshot-params-sandbox">sandboxing
-   flags</span>, and <var>entry</var>'s <span data-x="she-document-state">document state</span>'s
-   <span data-x="document-state-origin">origin</span>.</p></li>
+   flags</span>, null, and <var>entry</var>'s <span data-x="she-document-state">document
+   state</span>'s <span data-x="document-state-origin">origin</span>.</p></li>
 
    <li><p>Let <var>coop</var> be a new <span>cross-origin opener policy</span>.</p></li>
 
@@ -98136,8 +98137,9 @@ location.href = '#foo';</code></pre>
 
      <li><p>Set <var>responseOrigin</var> to the result of <span>determining the origin</span> given
      <var>response</var>'s <span data-x="concept-response-url">URL</span>,
-     <var>finalSandboxFlags</var>, <var>entry</var>'s and <span data-x="she-document-state">document
-     state</span>'s <span data-x="document-state-initiator-origin">initiator origin</span>.</p></li>
+     <var>finalSandboxFlags</var>, <var>entry</var>'s <span data-x="she-document-state">document
+     state</span>'s <span data-x="document-state-initiator-origin">initiator origin</span>, and
+     null.</p></li>
 
      <li>
       <p>If <var>navigable</var> is a <span>top-level traversable</span>, then:</p>