diff --git a/source b/source
index e8aed324d00..8c49418adf4 100644
--- a/source
+++ b/source
@@ -3009,7 +3009,6 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li>The <dfn data-x="js-HostEnqueuePromiseJob" data-x-href="https://tc39.es/ecma262/#sec-hostenqueuepromisejob">HostEnqueuePromiseJob</dfn> abstract operation</li>
      <li>The <dfn data-x="js-HostEnqueueTimeoutJob" data-x-href="https://tc39.es/ecma262/#sec-hostenqueuetimeoutjob">HostEnqueueTimeoutJob</dfn> abstract operation</li>
      <li>The <dfn data-x="js-HostEnsureCanAddPrivateElement" data-x-href="https://tc39.es/ecma262/#sec-hostensurecanaddprivateelement">HostEnsureCanAddPrivateElement</dfn> abstract operation</li>
-     <li>The <dfn data-x="js-HostEnsureCanCompileStrings" data-x-href="https://tc39.es/ecma262/#sec-hostensurecancompilestrings">HostEnsureCanCompileStrings</dfn> abstract operation</li>
      <li>The <dfn data-x="js-HostLoadImportedModule" data-x-href="https://tc39.es/proposal-import-attributes/#sec-HostLoadImportedModule">HostLoadImportedModule</dfn> abstract operation</li>
      <li>The <dfn data-x="js-HostMakeJobCallback" data-x-href="https://tc39.es/ecma262/#sec-hostmakejobcallback">HostMakeJobCallback</dfn> abstract operation</li>
      <li>The <dfn data-x="js-HostPromiseRejectionTracker" data-x-href="https://tc39.es/ecma262/#sec-host-promise-rejection-tracker">HostPromiseRejectionTracker</dfn> abstract operation</li>
@@ -3072,6 +3071,15 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li><dfn data-x-href="https://tc39.es/ecma262/#table-49">The <var>TypedArray</var> Constructors</dfn> table</li>
     </ul>
 
+    <p>Users agents that support JavaScript must also implement the <cite>Dynamic Code Brand
+    Checks</cite> proposal. The following terms are defined there, and used in this specification:
+    <ref>JSDYNAMICCODEBRANDCHECKS</ref></p>
+
+    <ul class="brief">
+     <li>The <dfn data-x="js-HostEnsureCanCompileStrings" data-x-href="https://tc39.es/proposal-dynamic-code-brand-checks/#sec-hostensurecancompilestrings">HostEnsureCanCompileStrings</dfn> abstract operation</li>
+     <li>The <dfn data-x="js-HostGetCodeForEval" data-x-href="https://tc39.es/proposal-dynamic-code-brand-checks/#sec-hostgetcodeforeval">HostGetCodeForEval</dfn> abstract operation</li>
+    </ul>
+
     <p>Users agents that support JavaScript must also implement <cite>ECMAScript
     Internationalization API</cite>. <ref>JSINTL</ref></p>
 
@@ -4613,6 +4621,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li><dfn data-x="tt-trustedhtml" data-x-href="https://w3c.github.io/trusted-types/dist/spec/#trustedhtml"><code>TrustedHTML</code></dfn></li>
      <li><dfn data-x="tt-trustedhtml-data" data-x-href="https://w3c.github.io/trusted-types/dist/spec/#trustedhtml-data">data</dfn></li>
      <li><dfn data-x="tt-trustedscript" data-x-href="https://w3c.github.io/trusted-types/dist/spec/#trusted-script"><code>TrustedScript</code></dfn></li>
+     <li><dfn data-x="tt-trustedscript-data" data-x-href="https://w3c.github.io/trusted-types/dist/spec/#trustedscript-data"><code>data</code></dfn></li>
      <li><dfn data-x="tt-trustedscripturl" data-x-href="https://w3c.github.io/trusted-types/dist/spec/#trustedscripturl"><code>TrustedScriptURL</code></dfn></li>
      <li><dfn data-x="tt-getcompliantstring" data-x-href="https://w3c.github.io/trusted-types/dist/spec/#get-trusted-type-compliant-string-algorithm">Get Trusted Type compliant string</dfn></li>
     </ul>
@@ -108912,18 +108921,39 @@ dictionary <dfn dictionary>PromiseRejectionEventInit</dfn> : <span>EventInit</sp
   security &mdash; that make implementation of private field semantics challenging, so our
   implementation simply rejects those objects.</p>
 
-  <h5><dfn data-x="the-hostensurecancompilestrings-implementation">HostEnsureCanCompileStrings</dfn>(<var>realm</var>)</h5>
+  <h5><dfn
+  data-x="the-hostensurecancompilestrings-implementation">HostEnsureCanCompileStrings</dfn>(<var>realm</var>,
+  <var>parameterStrings</var>, <var>bodyString</var>, <var>codeString</var>, <var>compilationType</var>,
+  <var>parameterArgs</var>, <var>bodyArg</var>)</h5>
 
   <p>JavaScript contains an <span>implementation-defined</span> <span
-  data-x="js-HostEnsureCanCompileStrings">HostEnsureCanCompileStrings</span>(<var>realm</var>)
-  abstract operation. User agents must use the following implementation: <ref>JAVASCRIPT</ref>
+  data-x="js-HostEnsureCanCompileStrings">HostEnsureCanCompileStrings</span> abstract operation,
+  redefined by the <cite>Dynamic Code Brand Checks</cite> proposal. User agents must use
+  the following implementation: <ref>JAVASCRIPT</ref> <ref>JSDYNAMICCODEBRANDCHECKS</ref>
 
   <ol>
    <li><p>Perform ? <span
-   data-x="csp-EnsureCSPDoesNotBlockStringCompilation">EnsureCSPDoesNotBlockStringCompilation</span>(<var>realm</var>).
+   data-x="csp-EnsureCSPDoesNotBlockStringCompilation">EnsureCSPDoesNotBlockStringCompilation</span>(<var>realm</var>,
+   <var>parameterStrings</var>, <var>bodyString</var>, <var>codeString</var>,
+   <var>compilationType</var>, <var>parameterArgs</var>, <var>bodyArg</var>).
    <ref>CSP</ref></p></li>
   </ol>
 
+  <h5><dfn
+  data-x="the-hostgetcodeforeval-implementation">HostGetCodeForEval</dfn>(<var>argument</var>)</h5>
+
+  <p>The <cite>Dynamic Code Brand Checks</cite> proposal contains an
+  <span>implementation-defined</span> <span
+  data-x="js-HostGetCodeForEval">HostGetCodeForEval</span>(<var>argument</var>) abstract operation.
+  User agents must use the following implementation: <ref>JSDYNAMICCODEBRANDCHECKS</ref>
+
+  <ol>
+   <li><p>If <var>argument</var> is a <code data-x="tt-trustedscript">TrustedScript</code> object,
+   then return <var>argument</var>'s <span data-x="tt-trustedscript-data">data</span>.</p></li>
+
+   <li><p>Otherwise, return no-code.</p></li>
+  </ol>
+
   <h5 id="the-hostpromiserejectiontracker-implementation"><dfn>HostPromiseRejectionTracker</dfn>(<var>promise</var>, <var>operation</var>)</h5>
 
   <p>JavaScript contains an <span>implementation-defined</span> <span
@@ -113588,9 +113618,10 @@ enum <dfn enum>DOMParserSupportedType</dfn> {
        <li><p><span>Assert</span>: <var>handler</var> is a string.</p></li>
 
        <li><p>Perform <span
-       data-x="the-hostensurecancompilestrings-implementation">HostEnsureCanCompileStrings</span>(<var>realm</var>).
-       If this throws an exception, catch it, <span>report the exception</span>, and abort these
-       steps.</p></li>
+       data-x="csp-EnsureCSPDoesNotBlockStringCompilation">EnsureCSPDoesNotBlockStringCompilation</span>(<var>realm</var>,
+       « », <var>handler</var>, <var>handler</var>, timer, « », <var>handler</var>). If this throws
+       an exception, catch it, <span>report the exception</span>, and abort these steps.</p></li>
+       <!-- timer is an enum value. -->
 
        <li><p>Let <var>settings object</var> be <var>global</var>'s <span>relevant settings
        object</span>.</p></li>
@@ -143177,6 +143208,9 @@ INSERT INTERFACES HERE
    <dt id="refsJSERRORSTACKS">[JSERRORSTACKS]</dt>
    <dd>(Non-normative) <cite><a href="https://tc39.es/proposal-error-stacks/">Error Stacks</a></cite>. Ecma International.</dd>
 
+   <dt id="refsJSDYNAMICCODEBRANDCHECKS">[JSDYNAMICCODEBRANDCHECKS]</dt>
+   <dd><cite><a href="https://tc39.es/proposal-dynamic-code-brand-checks/">Dynamic code brand checks</a></cite>. Ecma International.</dd>
+
    <dt id="refsJSIMPORTATTRIBUTES">[JSIMPORTATTRIBUTES]</dt>
    <dd><cite><a href="https://tc39.es/proposal-import-attributes/">Import attributes</a></cite>. Ecma International.</dd>