diff --git a/source b/source
index 2590aa57623..50ad60cf84a 100644
--- a/source
+++ b/source
@@ -4615,6 +4615,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li><dfn data-x-href="https://w3c.github.io/webdriver-bidi/#webdriver-bidi-navigable-destroyed">WebDriver BiDi navigable destroyed</dfn></li>
      <li><dfn data-x-href="https://w3c.github.io/webdriver-bidi/#webdriver-bidi-user-prompt-closed">WebDriver BiDi user prompt closed</dfn></li>
      <li><dfn data-x-href="https://w3c.github.io/webdriver-bidi/#webdriver-bidi-user-prompt-opened">WebDriver BiDi user prompt opened</dfn></li>
+     <li><dfn data-x-href="https://w3c.github.io/webdriver-bidi/#webdriver-bidi-file-dialog-opened">WebDriver BiDi file dialog opened</dfn></li>
     </ul>
    </dd>
 
@@ -53263,19 +53264,28 @@ You cannot submit this form when the field is incorrect.</samp></pre>
     <ol>
      <li><p>Optionally, wait until any prior execution of this algorithm has terminated.</p></li>
 
-     <li><p>Display a prompt to the user requesting that the user specify some files. If the <code
-     data-x="attr-input-multiple">multiple</code> attribute is not set on <var>element</var>, there
-     must be no more than one file selected; otherwise, any number may be selected. Files can be
-     from the filesystem or created on the fly, e.g., a picture taken from a camera connected to the
-     user's device.</p></li>
+     <li><p>Let <var>dismissed</var> be the result of <span>WebDriver BiDi file dialog opened</span>
+     with <var>element</var>.</p></li>
 
-     <li><p>Wait for the user to have made their selection.</p></li>
+     <li>
+      <p>If <var>dismissed</var> is false:</p>
 
-     <li><p>If the user dismissed the prompt without changing their selection, then <span>queue an
-     element task</span> on the <span>user interaction task source</span> given <var>element</var>
-     to <span data-x="concept-event-fire">fire an event</span> named <code
-     data-x="event-cancel">cancel</code> at <var>element</var>, with the <code
-     data-x="dom-Event-bubbles">bubbles</code> attribute initialized to true.</p></li>
+      <ol>
+       <li><p>Display a prompt to the user requesting that the user specify some files. If the <code
+       data-x="attr-input-multiple">multiple</code> attribute is not set on <var>element</var>, there
+       must be no more than one file selected; otherwise, any number may be selected. Files can be
+       from the filesystem or created on the fly, e.g., a picture taken from a camera connected to the
+       user's device.</p></li>
+
+       <li><p>Wait for the user to have made their selection.</p></li>
+      </ol>
+     </li>
+
+     <li><p>If <var>dismissed</var> is true or if the user dismissed the prompt without changing
+     their selection, then <span>queue an element task</span> on the <span>user interaction task
+     source</span> given <var>element</var> to <span data-x="concept-event-fire">fire an
+     event</span> named <code data-x="event-cancel">cancel</code> at <var>element</var>, with the
+     <code data-x="dom-Event-bubbles">bubbles</code> attribute initialized to true.</p></li>
 
      <li><p>Otherwise, <span>update the file selection</span> for <var>element</var>.</p></li>
     </ol>
@@ -147558,6 +147568,7 @@ INSERT INTERFACES HERE
   Magnus Kristiansen<!-- Dashiva -->,
   Maik Merten,
   Majid Valipour,
+  Maksim Sadym,
   Malcolm Rowe,
   Manish Goregaokar,
   Manish Tripathi,