File: hide-other-popover-side-effects.html

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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://chromium-review.googlesource.com/c/chromium/src/+/4094463/8/third_party/blink/renderer/core/html/html_element.cc#1404">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id=popover1 popover=auto>popover1</div>
<div id=popover2 popover=auto>popover2</div>

<script>
test(() => {
  const popover2 = document.getElementById('popover2');
  popover1.showPopover();
  popover1.addEventListener('beforetoggle', () => {
    popover2.remove();
  });
  assert_throws_dom('InvalidStateError', () => popover2.showPopover(),
    "popover1's beforetoggle event handler removes popover2 so showPopover should throw.");
  assert_false(popover2.matches(':popover-open'), 'popover2 should not match :popover-open once it is closed.');
}, 'Removing a popover while it is opening and force closing another popover should throw an exception.');
</script>