content/test/data/accessibility/event/popover-expanded-changed.html

<!--
  @UIA-WIN-DENY:*
  @UIA-WIN-ALLOW:ExpandCollapse*
  @UIA-WIN-ALLOW:AriaProperties*
-->
<!DOCTYPE html>

<button id=toggle popovertarget=p>Toggle button</button>
<button id=show popovertarget=p popovertargetaction=show>Show button</button>
<button id=hide popovertarget=p popovertargetaction=hide>Hide button</button>
<div popover id=p>Popover</div>

<script>
  var go_passes = [
    () => toggle.click(),
    () => toggle.click(),
    () => show.click(),
    () => hide.click(),
    () => show.click(),
    () => hide.click(),
  ];

  let current_pass = 0;
  function go() {
    go_passes[current_pass++].call();
    return current_pass < go_passes.length;
  }
</script>