diff --git a/source b/source
index 9f6f2489f80..d373caac6c9 100644
--- a/source
+++ b/source
@@ -84611,6 +84611,10 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
     </ol>
    </li>
 
+   <li><p>Let <var>autoPopoverListContainsElement</var> be true if <var>document</var>'s
+   <span>showing auto popover list</span>'s last item is <var>element</var>, otherwise
+   false.</p></li>
+
    <li><p>Set <var>element</var>'s <span>popover invoker</span> to null.</p></li>
 
    <li>
@@ -84623,6 +84627,11 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
      data-x="">open</code>" and the <code data-x="dom-ToggleEvent-newState">newState</code>
      attribute initialized to "<code data-x="">closed</code>" at <var>element</var>.</p></li>
 
+     <li><p>If <var>autoPopoverListContainsElement</var> is true and <var>document</var>'s
+     <span>showing auto popover list</span>'s last item is not <var>element</var>, then run <span
+     data-x="hide-all-popovers-until">hide all popovers until</span> given <var>element</var>,
+     <var>focusPreviousElement</var>, and false.</p></li>
+
      <li>
       <p>If the result of running <span>check popover validity</span> given <var>element</var>,
       true, <var>throwExceptions</var>, and null is false, then run <var>cleanupSteps</var> and
@@ -84702,6 +84711,10 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
   <var>focusPreviousElement</var>, and a boolean <var>fireEvents</var>:</p>
 
   <ol>
+   <li><p>If <var>endpoint</var> is an <span data-x="HTML elements">HTML element</span> and
+   <var>endpoint</var> is not in the <span data-x="popover-showing-state">popover showing
+   state</span>, then return.</p></li>
+
    <li><p>Let <var>document</var> be <var>endpoint</var>'s <span>node document</span>.</p></li>
 
    <li>