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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-removal.html 

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Popover document removal behavior</title>
<link rel="author" href="mailto:[email protected]">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div popover id=popover>Popover</div>

<script>
promise_test(async t => {
  function loadCompleted() {
    return new Promise(resolve => {
      window.addEventListener('load', resolve);
    });
  }
  const popover = document.querySelector('[popover]');
  assert_false(popover.matches(':popover-open'));
  popover.showPopover();
  assert_true(popover.matches(':popover-open'));
  popover.remove(); // Shouldn't cause any issues
  document.body.click(); // Shouldn't cause light dismiss problems
  await loadCompleted(); // The document should finish loading
}, 'Removal from the document shouldn\'t cause issues');

</script>