diff --git a/source b/source
index ecce5858cd9..711e1a3ea51 100644
--- a/source
+++ b/source
@@ -4576,6 +4576,18 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li><dfn data-x-href="https://w3c.github.io/web-locks/#lock-request">lock requests</dfn></li>
     </ul>
    </dd>
+
+   <dt>Trusted Types</dt>
+
+   <dd>
+    <p>This specification uses the following features defined in <cite>Trusted Types</cite>:
+    <ref>TRUSTED-TYPES</ref></p>
+
+    <ul class="brief">
+     <li><dfn data-x="tt-htmlstring" data-x-href="https://w3c.github.io/trusted-types/dist/spec/#typedefdef-htmlstring"><code>HTMLString</code></dfn></li>
+     <li><dfn data-x="tt-scripturlstring" data-x-href="https://w3c.github.io/trusted-types/dist/spec/#typedefdef-scripturlstring"><code>ScriptURLString</code></dfn></li>
+     </ul>
+   </dd>
   </dl>
 
   <hr>
@@ -10626,7 +10638,7 @@ typedef (<span>HTMLScriptElement</span> or <span>SVGScriptElement</span>) <dfn t
 
 [<span>LegacyOverrideBuiltIns</span>]
 partial interface <dfn id="document" data-lt="">Document</dfn> {
-  static <code>Document</code> <span data-x="dom-parseHTMLUnsafe">parseHTMLUnsafe</span>(DOMString html);
+  static <code>Document</code> <span data-x="dom-parseHTMLUnsafe">parseHTMLUnsafe</span>(<span data-x="tt-htmlstring">HTMLString</span> html);
 
   // <span>resource metadata management</span>
   [PutForwards=<span data-x="dom-location-href">href</span>, <span>LegacyUnforgeable</span>] readonly attribute <span>Location</span>? <span data-x="dom-document-location">location</span>;
@@ -10655,8 +10667,8 @@ partial interface <dfn id="document" data-lt="">Document</dfn> {
   [<span>CEReactions</span>] <span>Document</span> <span data-x="dom-document-open">open</span>(optional DOMString unused1, optional DOMString unused2); // both arguments are <a href="#dom-document-open-unused-arguments">ignored</a>
   <span>WindowProxy</span>? <span data-x="dom-document-open-window">open</span>(USVString url, DOMString name, DOMString features);
   [<span>CEReactions</span>] undefined <span data-x="dom-document-close">close</span>();
-  [<span>CEReactions</span>] undefined <span data-x="dom-document-write">write</span>(DOMString... text);
-  [<span>CEReactions</span>] undefined <span data-x="dom-document-writeln">writeln</span>(DOMString... text);
+  [<span>CEReactions</span>] undefined <span data-x="dom-document-write">write</span>(<span data-x="tt-htmlstring">HTMLString</span>... text);
+  [<span>CEReactions</span>] undefined <span data-x="dom-document-writeln">writeln</span>(<span data-x="tt-htmlstring">HTMLString</span>... text);
 
   // <span>user interaction</span>
   readonly attribute <span>WindowProxy</span>? <span data-x="dom-document-defaultView">defaultView</span>;
@@ -33014,7 +33026,7 @@ interface <dfn interface>HTMLIFrameElement</dfn> : <span>HTMLElement</span> {
   [<span>HTMLConstructor</span>] constructor();
 
   [<span>CEReactions</span>] attribute USVString <span data-x="dom-iframe-src">src</span>;
-  [<span>CEReactions</span>] attribute DOMString <span data-x="dom-iframe-srcdoc">srcdoc</span>;
+  [<span>CEReactions</span>] attribute <span data-x="tt-htmlstring">HTMLString</span> <span data-x="dom-iframe-srcdoc">srcdoc</span>;
   [<span>CEReactions</span>] attribute DOMString <span data-x="dom-iframe-name">name</span>;
   [SameObject, PutForwards=<span data-x="dom-DOMTokenList-value">value</span>] readonly attribute <span>DOMTokenList</span> <span data-x="dom-iframe-sandbox">sandbox</span>;
   [<span>CEReactions</span>] attribute DOMString <span data-x="dom-iframe-allow">allow</span>;
@@ -112268,7 +112280,7 @@ document.body.appendChild(frame)</code></pre>
 interface <dfn interface>DOMParser</dfn> {
   <span data-x="dom-DOMParser-constructor">constructor</span>();
 
-  [NewObject] <code>Document</code> <span data-x="dom-DOMParser-parseFromString">parseFromString</span>(DOMString <var>string</var>, <span>DOMParserSupportedType</span> <var>type</var>);
+  [NewObject] <code>Document</code> <span data-x="dom-DOMParser-parseFromString">parseFromString</span>(<span data-x="tt-htmlstring">HTMLString</span> <var>string</var>, <span>DOMParserSupportedType</span> <var>type</var>);
 };
 
 enum <dfn enum>DOMParserSupportedType</dfn> {
@@ -112419,11 +112431,11 @@ enum <dfn enum>DOMParserSupportedType</dfn> {
   and attributes like <code>script</code> or <span>event handler content attributes</span>.</p>
 
   <pre><code class="idl">partial interface <span id="Element-partial">Element</span> {
-  [<span>CEReactions</span>] undefined <span data-x="dom-Element-setHTMLUnsafe">setHTMLUnsafe</span>(DOMString html);
+  [<span>CEReactions</span>] undefined <span data-x="dom-Element-setHTMLUnsafe">setHTMLUnsafe</span>(<span data-x="tt-htmlstring">HTMLString</span> html);
 };
 
 partial interface <span id="ShadowRoot-partial">ShadowRoot</span> {
-  [<span>CEReactions</span>] undefined <span data-x="dom-ShadowRoot-setHTMLUnsafe">setHTMLUnsafe</span>(DOMString html);
+  [<span>CEReactions</span>] undefined <span data-x="dom-ShadowRoot-setHTMLUnsafe">setHTMLUnsafe</span>(<span data-x="tt-htmlstring">HTMLString</span> html);
 };</code></pre>
 
   <div w-nodev>
@@ -117547,7 +117559,7 @@ interface <dfn interface>WorkerGlobalScope</dfn> : <span>EventTarget</span> {
   readonly attribute <span>WorkerGlobalScope</span> <span data-x="dom-WorkerGlobalScope-self">self</span>;
   readonly attribute <span>WorkerLocation</span> <span data-x="dom-WorkerGlobalScope-location">location</span>;
   readonly attribute <span>WorkerNavigator</span> <span data-x="dom-worker-navigator">navigator</span>;
-  undefined <span data-x="dom-WorkerGlobalScope-importScripts">importScripts</span>(USVString... urls);
+  undefined <span data-x="dom-WorkerGlobalScope-importScripts">importScripts</span>(<span data-x="tt-scripturlstring">ScriptURLString</span>... urls);
 
   attribute <span>OnErrorEventHandler</span> <span data-x="handler-WorkerGlobalScope-onerror">onerror</span>;
   attribute <span>EventHandler</span> <span data-x="handler-WorkerGlobalScope-onlanguagechange">onlanguagechange</span>;
@@ -118402,7 +118414,7 @@ interface <dfn interface>SharedWorkerGlobalScope</dfn> : <span>WorkerGlobalScope
 
   <pre><code class="idl">[Exposed=(Window,DedicatedWorker,SharedWorker)]
 interface <dfn interface>Worker</dfn> : <span>EventTarget</span> {
-  <span data-x="dom-Worker">constructor</span>(USVString scriptURL, optional <span>WorkerOptions</span> options = {});
+  <span data-x="dom-Worker">constructor</span>(<span data-x="tt-scripturlstring">ScriptURLString</span> scriptURL, optional <span>WorkerOptions</span> options = {});
 
   undefined <span data-x="dom-Worker-terminate">terminate</span>();
 
@@ -118541,7 +118553,7 @@ enum <dfn enum>WorkerType</dfn> { "classic", "module" };
 
   <pre><code class="idl">[Exposed=Window]
 interface <dfn interface>SharedWorker</dfn> : <span>EventTarget</span> {
-  <span data-x="dom-SharedWorker">constructor</span>(USVString scriptURL, optional (DOMString or <span>WorkerOptions</span>) options = {});
+  <span data-x="dom-SharedWorker">constructor</span>(<span data-x="tt-scripturlstring">ScriptURLString</span> scriptURL, optional (DOMString or <span>WorkerOptions</span>) options = {});
 
   readonly attribute <span>MessagePort</span> <span data-x="dom-SharedWorker-port">port</span>;
 };
@@ -142366,6 +142378,9 @@ INSERT INTERFACES HERE
    <dt id="refsTOUCH">[TOUCH]</dt>
    <dd><cite><a href="https://w3c.github.io/touch-events/">Touch Events</a></cite>, D. Schepers, S. Moon, M. Brubeck, A. Barstow, R. Byers. W3C.</dd>
 
+   <dt id="refsTRUSTED-TYPES">[TRUSTED-TYPES]</dt>
+   <dd><cite><a href="https://w3c.github.io/trusted-types/dist/spec/">Trusted Types</a></cite>, K. Kotowicz, M. West. W3C.</dd>
+
    <dt id="refsTZDATABASE">[TZDATABASE]</dt>
    <dd>(Non-normative) <cite><a href="https://www.iana.org/time-zones">Time Zone Database</a></cite>. IANA.</dd>