diff --git a/source b/source
index e770453bb40..b1d522b120a 100644
--- a/source
+++ b/source
@@ -4341,6 +4341,23 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
     </ul>
    </dd>
 
+
+   <dt>WebDriver</dt>
+
+   <dd>
+    <p>The following terms are defined in <cite>WebDriver</cite>: <ref spec=WEBDRIVER></p>
+
+    <ul class="brief">
+     <li><dfn data-x-href="https://w3c.github.io/webdriver/#dfn-error" data-x="wd-error">Error</dfn></li>
+     <li><dfn data-x-href="https://w3c.github.io/webdriver/#dfn-error-code" data-x="wd-error-code">Error code</dfn></li>
+     <li><dfn data-x-href="https://w3c.github.io/webdriver/#dfn-extension-commands" data-x="wd-extension-command">Extension commands</dfn></li>
+     <li><dfn data-x-href="https://w3c.github.io/webdriver/#dfn-extension-command-uri-template" data-x="wd-uri-template">Extension command URI Template</dfn></li>
+     <li><dfn data-x-href="https://w3c.github.io/webdriver/#dfn-handle-any-user-prompts">Handle any user prompts</dfn></li>
+     <li><dfn data-x-href="https://w3c.github.io/webdriver/#dfn-no-such-window">No such window</dfn></li>
+     <li><dfn data-x-href="https://w3c.github.io/webdriver/#dfn-remote-end-steps">Remote end steps</dfn></li>
+    </ul>
+   </dd>
+
    <dt>WebDriver BiDi</dt>
 
    <dd>
@@ -76022,6 +76039,50 @@ partial interface <span id="NavigatorUserActivation-partial">Navigator</span> {
 
   </div>
 
+  <h4>Automated Testing</h4>
+
+  <p>
+   For the purposes of user-agent automation and application testing, this document defines the
+   following <span data-x="wd-extension-command">extension commands</span> for the <cite>Web
+   Driver</cite> specification. <ref spec=WEBDRIVERBIDI> It is optional for a user agent to support
+   the following <span data-x="wd-extension-command">extension commands</span>.
+  </p>
+
+  <h5><dfn>Consume user activation of Window</dfn></h5>
+
+  <table>
+   <thead>
+    <tr>
+     <th>HTTP Method
+     <th><span data-x="wd-uri-template">URI Template</span>
+     <th><span data-x="wd-extension-command">Command</span>
+   <tbody>
+    <tr>
+     <td>POST
+     <td>/session/{<var>session id</var>}/window/consume-user-activation
+     <td><span>Consume user activation of Window</span>
+  </table>
+
+  <p>The <span>remote end steps</span> are:
+
+  <ol>
+   <li><p>If the <span>top-level browsing context</span> has been <span data-x="bcg
+   remove">removed</span>, return <span data-x="wd-error">error</span> with <span
+   data-x="wd-error-code">error code</span> <span>no such window</span>.
+
+   <li><p><span>Handle any user prompts</span> and return its value if it is an <span
+   data-x="wd-error">error</span>.
+
+   <li><p>Let <var>window</var> be <span>top-level browsing context</span>'s <span>active
+   window</span>.
+
+   <li><p>Let <var>consume</var> be true if <var>window</var> has <span>transient activation</span>
+   or false otherwise.
+
+   <li><p>If <var>consume</var> is true, <span>consume user activation</span> of <var>window</var>.
+
+   <li><p>Return <var>success</var> with data <var>consume</var>.
+  </ol>
 
   <h3 id="activation">Activation behavior of elements</h3>
 
@@ -131604,6 +131665,9 @@ INSERT INTERFACES HERE
    <dt id="refsWEBCRYPTO">[WEBCRYPTO]</dt>
    <dd><cite><a href="https://w3c.github.io/webcrypto/Overview.html">Web Cryptography API</a></cite>, D. Huigens. W3C.</dd>
 
+   <dt id="refsWEBDRIVER">[WEBDRIVER]</dt>
+   <dd><cite><a href="https://w3c.github.io/webdriver/">WebDriver</a></cite>, S. Stewart, D. Burns. W3C</dd>
+
    <dt id="refsWEBDRIVERBIDI">[WEBDRIVERBIDI]</dt>
    <dd><cite><a href="https://w3c.github.io/webdriver-bidi/">WebDriver BiDi</a></cite>. W3C</dd>