Do not establish close watchers in non-fully active documents

Closes #10634. See #10659 for a better followup.

Author: domenic

source

@@ -61649,8 +61649,9 @@ interface <dfn interface>HTMLDialogElement</dfn> : <span>HTMLElement</span> {
    to the top layer</span> given <span>this</span>.</p></li>
 
    <li id="canceling-dialogs">
-    <p>Set <span>this</span>'s <span data-x="dialog-close-watcher">close watcher</span> to the
-    result of <span data-x="establish a close watcher">establishing a close watcher</span> given
+    <p>If <span>this</span>'s <span>node document</span> is <span>fully active</span>, then set
+    <span>this</span>'s <span data-x="dialog-close-watcher">close watcher</span> to the result of
+    <span data-x="establish a close watcher">establishing a close watcher</span> given
     <span>this</span>'s <span>relevant global object</span>, with:</p>
 
     <ul>
@@ -61664,6 +61665,10 @@ interface <dfn interface>HTMLDialogElement</dfn> : <span>HTMLElement</span> {
      <li><p><i data-x="create-close-watcher-closeAction">closeAction</i> being to <span>close the
      dialog</span> given <span>this</span> and null.</p></li>
     </ul>
+
+    <p class="XXX">It would be better if this method failed early for the non-<span>fully
+    active</span> case. That is being tracked in <a
+    href="https://github.com/whatwg/html/issues/10659">issue #10659</a>.</p>
    </li>
 
    <li><p>Set <span>this</span>'s <span>previously focused element</span> to the
@@ -85392,9 +85397,10 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
      </li>
 
      <li id="canceling-popovers">
-      <p>Set <var>element</var>'s <span>popover close watcher</span> to the result of <span
-      data-x="establish a close watcher">establishing a close watcher</span> given
-      <var>element</var>'s <span>relevant global object</span>, with:</p>
+      <p>If <var>document</var> is <span>fully active</span>, then set <var>element</var>'s
+      <span>popover close watcher</span> to the result of <span data-x="establish a close
+      watcher">establishing a close watcher</span> given <var>element</var>'s <span>relevant global
+      object</span>, with:</p>
 
       <ul>
        <li><p><i data-x="create-close-watcher-cancelAction">cancelAction</i> being to return
@@ -85404,6 +85410,10 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
        data-x="hide popover algorithm">hide a popover</span> given <var>element</var>, true, true,
        and false.</p></li>
       </ul>
+
+      <p class="XXX">It would be better if this algorithm failed early for the non-<span>fully
+      active</span> case. That is being tracked in <a
+      href="https://github.com/whatwg/html/issues/10659">issue #10659</a>.</p>
      </li>
     </ol>
    </li>