fix null hideUntil

Author: josepharhar

source

@@ -61124,6 +61124,9 @@ interface <dfn interface>HTMLDialogElement</dfn> : <span>HTMLElement</span> {
    <li><p>Let <var>hideUntil</var> be the result of running <span>topmost popover ancestor</span>
    given <span>this</span>, null, and false.</p></li>
 
+   <li><p>If <var>hideUntil</var> is null, then set <var>hideUntil</var> to <span>this</span>'s
+   <span>node document</span>.</p></li>
+
    <li><p>Run <span data-x="hide-all-popovers-until">hide all popovers until</span> given
    <var>hideUntil</var>, false, and true.</p></li>
 
@@ -61190,6 +61193,9 @@ interface <dfn interface>HTMLDialogElement</dfn> : <span>HTMLElement</span> {
    <li><p>Let <var>hideUntil</var> be the result of running <span>topmost popover ancestor</span>
    given <span>this</span>, null, and false.</p></li>
 
+   <li><p>If <var>hideUntil</var> is null, then set <var>hideUntil</var> to <span>this</span>'s
+   <span>node document</span>.</p></li>
+
    <li><p>Run <span data-x="hide-all-popovers-until">hide all popovers until</span> given
    <var>hideUntil</var>, false, and true.</p></li>