diff --git a/source b/source
index 3a0d3fcc078..974c714947d 100644
--- a/source
+++ b/source
@@ -16162,6 +16162,7 @@ interface <dfn interface>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
   the processing model, and are supported by the user agent. The possible <span
   data-x="concept-supported-tokens">supported tokens</span> are
   <code data-x="rel-alternate">alternate</code>,
+  <code data-x="rel-compression-dictionary">compression-dictionary</code>,
   <code data-x="rel-dns-prefetch">dns-prefetch</code>,
   <code data-x="rel-expect">expect</code>,
   <code data-x="rel-icon">icon</code>,
@@ -27219,6 +27220,7 @@ document.body.appendChild(wbr);</code></pre>
 
   <p>Keywords that are <dfn>body-ok</dfn> affect whether <code>link</code> elements are
   <span>allowed in the body</span>. The <span>body-ok</span> keywords are
+  <code data-x="rel-compression-dictionary">compression-dictionary</code>,
   <code data-x="rel-dns-prefetch">dns-prefetch</code>,
   <code data-x="rel-modulepreload">modulepreload</code>,
   <code data-x="rel-pingback">pingback</code>,
@@ -27284,6 +27286,17 @@ document.body.appendChild(wbr);</code></pre>
      <td>Gives the permalink for the nearest ancestor section.</td>
     </tr>
 
+    <tr>
+     <td><code data-x="rel-compression-dictionary">compression-dictionary</code></td>
+     <td><span data-x="external resource link">External Resource</span></td>
+     <td colspan="2"><em>not allowed</em></td>
+     <td class="yes"> Yes </td>
+     <td class="yes"> Yes </td>
+     <td>Specifies that the user agent should preemptively <span data-x="concept-fetch">fetch</span> and cache the
+     target resource as it is likely to be useful as a compression dictionary for future
+     <span data-x="concept-fetch">fetches</span>. <ref>RFC9842</ref></td>
+    </tr>
+
     <tr>
      <td><code data-x="rel-dns-prefetch">dns-prefetch</code></td>
      <td><span data-x="external resource link">External Resource</span></td>
@@ -27705,6 +27718,94 @@ document.body.appendChild(wbr);</code></pre>
   Link Relation</cite>. <ref>RFC6596</ref></p>
 
 
+  <h5>Link type "<dfn attr-value for="link/rel"><code
+  data-x="rel-compression-dictionary">compression-dictionary</code></dfn>"</h5>
+
+  <p>The <code data-x="rel-compression-dictionary">compression-dictionary</code> keyword may be used
+  with <code>link</code> elements. This keyword creates an <span data-x="external resource link">external
+  resource link</span>. This keyword is <span>body-ok</span>.</p>
+
+  <p>The <code data-x="rel-compression-dictionary">compression-dictionary</code> keyword indicates
+  that preemptively <span data-x="concept-fetch">fetching</span> and caching the specified resource
+  or same-site document is likely to be beneficial, as it is highly likely that the user will
+  be able to this resource as a compression dictionary for future
+  <span data-x="concept-fetch">fetches</span>. <ref>RFC9842</ref></p>
+
+  <p>There is no default type for resources given by the
+  <code data-x="rel-compression-dictionary">compression-dictionary</code> keyword.</p>
+
+  <p>The appropriate times to <span data-x="fetch and process the linked resource">fetch and
+  process</span> this type of link are:</p>
+
+  <ul>
+   <li><p>When the <span>external resource link</span> is created on a <code>link</code> element
+   that is already <span>browsing-context connected</span>.</p></li>
+
+   <li><p>When the <span>external resource link</span>'s <code>link</code> element <span>becomes
+   browsing-context connected</span>.</p></li>
+
+   <li><p>When the <code data-x="attr-link-href">href</code> attribute of the <code>link</code>
+   element of an <span>external resource link</span> that is already <span>browsing-context
+   connected</span> is changed.</p></li>
+
+   <li><p>When the <code data-x="attr-link-crossorigin">crossorigin</code> attribute of the
+   <code>link</code> element of an <span data-x="external resource link">external resource
+   link</span> that is already <span>browsing-context connected</span> is set, changed, or
+   removed.</p></li>
+  </ul>
+
+  <div algorithm>
+  <p>The <span>fetch and process the linked resource</span> steps for this type of linked resource,
+  given a <code>link</code> element <var>el</var>, are to <span
+  data-x="create link options from element">create link options</span> from <var>el</var> and
+  to <span>load a compression dictionary</span> given the result and <var>el</var>.</p>
+
+  <p>The <span>process a link header</span> step for this type of linked resource given a <span
+  data-x="link processing options">link processing options</span> <var>options</var> are to
+  <span>load a compression dictionary</span> given <var>options</var>.</p>
+
+  <p>To <dfn>load a compression dictionary</dfn> given a <span>link processing options</span>
+  <var>options</var> and optional <code>link</code> element <var>el</var>:</p>
+
+  <ol>
+   <li><p>If <var>options</var>'s <span data-x="link options crossorigin">crossorigin</span>
+  is <span data-x="attr-crossorigin-none">No CORS</span>, set <var>options</var>'s
+  <span data-x="link options crossorigin">crossorigin</span> to
+  <span data-x="attr-crossorigin-anonymous">Anonymous</span>.</p></li>
+
+   <li><p>Set <var>options</var>'s <span data-x="link options destination">destination</span> to
+   the empty string.</p></li>
+
+   <li><p>Let <var>request</var> be the result of <span data-x="create a link request">creating a
+   link request</span> given <var>options</var>.</p></li>
+
+   <li><p>If <var>request</var> is null, then return.</p></li>
+
+   <li><p>Set <var>request</var>'s <span data-x="concept-request-initiator">initiator</span> to
+   "<code data-x="">compression-dictionary</code>".</p></li>
+
+   <li>
+    <p>Let <var>processCompressionDictionaryResponse</var> be the following steps given a <span
+    data-x="concept-response">response</span> <var>response</var> and null, failure, or a
+    <span>byte sequence</span> <var>bytesOrNull</var>:</p>
+
+    <ol>
+     <li><p>If <var>response</var> is a <span>network error</span> and <var>el</var> is set, <span
+     data-x="concept-event-fire">fire an event</span> named <code
+     data-x="event-error">error</code> at <var>el</var>.</p></li>
+
+     <li><p>Otherwise, if <var>el</var> is set, <span data-x="concept-event-fire">fire an event</span>
+     named <code data-x="event-load">load</code> at <var>el</var>.</p></li>
+    </ol>
+   </li>
+
+   <li><p>The user agent should <span data-x="concept-fetch">fetch</span> <var>request</var>, with
+   <i data-x="processResponseConsumeBody">processResponseConsumeBody</i> set to
+   <var>processCompressionDictionaryResponse</var>. User agents may delay the fetching of
+   <var>request</var> to prioritize other requests that are necessary for the current document.</p></li>
+  </ol>
+  </div>
+
   <h5>Link type "<dfn attr-value for="link/rel"><code
   data-x="rel-dns-prefetch">dns-prefetch</code></dfn>"</h5>
 
@@ -155627,6 +155728,9 @@ INSERT INTERFACES HERE
    <dt id="refsRFC8297">[RFC8297]</dt>
    <dd><cite><a href="https://httpwg.org/specs/rfc8297.html">An HTTP Status Code for Indicating Hints</a></cite>, K. Oku. IETF.</dd>
 
+   <dt id="refsRFC9842">[RFC9842]</dt>
+   <dd><cite><a href="https://www.rfc-editor.org/rfc/rfc9842">Compression Dictionary Transport</a></cite>, P. Meenan, Y. Weiss. IETF.</dd>
+
    <dt id="refsSCREENORIENTATION">[SCREENORIENTATION]</dt>
    <dd><cite><a href="https://w3c.github.io/screen-orientation/">Screen Orientation</a></cite>, M. Cáceres. W3C.</dd>