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@@ -3009,6 +3009,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li><dfn data-x-href="https://tc39.es/ecma262/#sec-agents">agent</dfn> and
          <dfn data-x-href="https://tc39.es/ecma262/#sec-agent-clusters">agent cluster</dfn></li>
      <li><dfn data-x-href="https://tc39.es/ecma262/#sec-automatic-semicolon-insertion">automatic semicolon insertion</dfn></li>
+     <li><dfn data-x-href="https://tc39.es/ecma262/#sec-candidate-executions">candidate execution</dfn></li>
      <li>The <dfn data-x-href="https://tc39.es/ecma262/#current-realm">current Realm Record</dfn></li>
      <li><dfn data-x-href="https://tc39.es/ecma262/#early-error-rule">early error</dfn></li>
      <li><dfn data-x-href="https://tc39.es/ecma262/#sec-invariants-of-the-essential-internal-methods">invariants of the essential internal methods</dfn></li>
@@ -78624,8 +78625,8 @@ console.assert(iframeWindow.frameElement === null);
   <p>A <dfn>browsing context group</dfn> holds a <dfn>browsing context set</dfn> (a <span>set</span>
   of <span data-x="top-level browsing context">top-level browsing contexts</span>).</p>
 
-  <p>A <span>browsing context group</span> has associated <dfn>agent cluster map</dfn> (a weak <span
-  data-x="ordered map">map</span> of <span>agent cluster key</span> to <span>agent
+  <p>A <span>browsing context group</span> has an associated <dfn>agent cluster map</dfn> (a weak
+  <span data-x="ordered map">map</span> of <span>agent cluster key</span> to <span>agent
   cluster</span>). User agents are responsible for collecting agent clusters when it is deemed that
   nothing can access them anymore.</p>
 
@@ -90413,11 +90414,11 @@ import "https://example.com/foo/../module2.mjs";</code></pre>
   of <span data-x="similar-origin window agent">similar-origin window agents</span>.</p>
 
 
-  <p>A <dfn data-export="">scheme-and-site</dfn> is a <span>tuple</span> of a <span
+  <p>A <dfn data-export="">scheme-and-registrable-domain</dfn> is a <span>tuple</span> of a <span
   data-x="concept-url-scheme">scheme</span> and a <span data-x="concept-domain">domain</span>.</p>
 
   <p>An <dfn data-export="">agent cluster key</dfn> is an <span>origin</span> or a
-  <span>scheme-and-site</span>.</p>
+  <span>scheme-and-registrable-domain</span>.</p>
 
   <p>To <dfn data-x="obtain-agent-cluster-key">obtain an agent cluster key</dfn>, given an origin
   <var>origin</var>, run these steps:</p>
@@ -90426,11 +90427,11 @@ import "https://example.com/foo/../module2.mjs";</code></pre>
    <li><p>If <var>origin</var> is an <span data-x="concept-origin-opaque">opaque origin</span>, then
    return <var>origin</var>.</p></li>
 
-   <li><p>If <var>origin</var>'s <span data-x="concept-host">host</span>'s <span>registrable
+   <li><p>If <var>origin</var>'s <span data-x="concept-origin-host">host</span>'s <span>registrable
    domain</span> is null, then return <var>origin</var>.</p></li>
 
-   <li><p>Return (<var>origin</var>'s <span data-x="concept-url-scheme">scheme</span>,
-   <var>origin</var>'s <span data-x="concept-host">host</span>'s <span>registrable
+   <li><p>Return (<var>origin</var>'s <span data-x="concept-origin-scheme">scheme</span>,
+   <var>origin</var>'s <span data-x="concept-origin-host">host</span>'s <span>registrable
    domain</span>).</p></li>
   </ol>
 
@@ -90450,8 +90451,17 @@ import "https://example.com/foo/../module2.mjs";</code></pre>
    <li><p>Return <var>agentCluster</var>'s <span>similar-origin window agent</span>.</p></li>
   </ol>
 
-  <p>A <dfn data-export="">similar-origin window agent</dfn> is an <span>agent</span> whose
-  [[CanBlock]] is false. </p>
+  <p>A <dfn data-export="">similar-origin window agent</dfn> is an <span>agent</span> created
+  during the course of the following algorithm:</p>
+
+  <ol>
+   <li><p>Let <var>signifier</var> be a new unique internal value.</p></li>
+
+   <li><p>Let <var>candidateExecution</var> be a new <span>candidate execution</span>.</p></li>
+
+   <li><p>Return a new <span>agent</span> whose [[CanBlock]] is true, [[Signifier]] is
+   <var>signifier</var> and [[CandidateExecution]] is <var>candidateExecution</var>.</p></li>
+  </ol>
 
   <p class="note">All global objects that use this agent all have a similar <span>origin</span> and
   are allocated via the <span data-x="obtain-similar-origin-window-agent">obtain similar-origin
@@ -90467,8 +90477,7 @@ import "https://example.com/foo/../module2.mjs";</code></pre>
     exists">does not exist:</span></p>
     <ol>
      <li><p>Let <var>agentCluster</var> be a new <span>agent cluster</span>.</p></li>
-     <li><p>Set <var>agentCluster</var>'s <span>similar-origin window agent</span> be a new
-     <span>similar-origin window agent</span>.</p></li>
+     <li><p>Add a new <span>similar-origin window agent</span> to <var>agentCluster</var>.</p></li>
      <li><p>Set <var>group</var>'s <span>agent cluster map</span>[<var>key</var>] to
      <var>agentCluster</var>.</p></li>
     </ol>