Fix focus navigation scope owner for popovers

The focus navigation scope owner was erroneously set to the popover itself for popovers, when it should be the popover's invoker element.

Fixes #11159.

Author: josepharhar

source

@@ -80950,9 +80950,9 @@ dictionary <dfn dictionary>CommandEventInit</dfn> : <span>EventInit</span> {
   <hr>
 
   <p>A node is a <dfn>focus navigation scope owner</dfn> if it is a <code>Document</code>, a
-  <span>shadow host</span>, a <span>slot</span>, or an element in the <span
-  data-x="popover-showing-state">popover showing state</span> which also has a <span>popover
-  invoker</span> set.</p>
+  <span>shadow host</span>, a <span>slot</span>, or an element which is the <span>popover
+  invoker</span> of an element in the <span data-x="popover-showing-state">popover showing
+  state</span>.</p>
 
   <p>Each <span>focus navigation scope owner</span> has a <dfn>focus navigation scope</dfn>, which
   is a list of elements. Its contents are determined as follows:</p>
@@ -80974,7 +80974,8 @@ dictionary <dfn dictionary>CommandEventInit</dfn> : <span>EventInit</span> {
    parent's <span>node document</span>.</p></li>
 
    <li><p>If <var>element</var> is in the <span data-x="popover-showing-state">popover showing
-   state</span> and has a <span>popover invoker</span> set, then return <var>element</var>.</p></li>
+   state</span> and has a <span>popover invoker</span> set, then return <var>element</var>'s
+   <span>popover invoker</span>.</p></li>
 
    <li><p>Return <var>element</var>'s parent's <span>associated focus navigation owner</span>.</p></li>
   </ol>