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@@ -110688,6 +110688,9 @@ partial interface <span id="ShadowRoot-partial">ShadowRoot</span> {
    object; otherwise let <var>thisArg</var> be the <code>WindowProxy</code> that corresponds to
    <var>global</var>.</p></li>
 
+   <li><p>Let <var>snapshot</var> be <span
+   data-x="js-AsyncContextSnapshot">AsyncContextSnapshot</span>().</p></li>
+
    <li><p>If <var>previousId</var> was given, let <var>id</var> be <var>previousId</var>;
    otherwise, let <var>id</var> be an <span>implementation-defined</span> integer that is greater
    than zero and does not already <span data-x="map exists">exist</span> in <var>global</var>'s
@@ -110721,6 +110724,10 @@ partial interface <span id="ShadowRoot-partial">ShadowRoot</span> {
     substeps:</p>
 
     <ol>
+     <li><p>Let <var>previousContextMapping</var> be <span
+     data-x="js-AsyncContextSwap">AsyncContextSwap</span>(<var
+     >callback</var>.[[AsyncContextSnapshot]]).</p></li>
+
      <li><p>If <var>id</var> does not <span data-x="map exists">exist</span> in <var>global</var>'s
      <span>map of active timers</span>, then abort these steps.</p></li>
 
@@ -110806,6 +110813,10 @@ partial interface <span id="ShadowRoot-partial">ShadowRoot</span> {
 
      <li><p>Otherwise, <span data-x="map remove">remove</span> <var>global</var>'s <span>map of
      active timers</span>[<var>id</var>].</p></li>
+
+      <!-- XXX early returns -->
+     <li><p>Perform <span
+     data-x="js-AsyncContextSwap">AsyncContextSwap</span>(<var>previousContextMapping</var>).</p></li>
     </ol>
    </li>