deletefromdocument-shadow-leak.html

<!DOCTYPE html>
<body>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(() => {
  let textarea = document.createElement('textarea');
  document.body.appendChild(textarea);
  textarea.select();
  getSelection().deleteFromDocument();
  let anchor = getSelection().anchorNode;
  assert_equals(anchor.getRootNode(), document);
}, 'deleteFromDocument should not leak a UA shadow element in TEXTAREA.');
</script>
</body>

chromium/third_party/blink/web_tests/editing/selection/deletefromdocument-shadow-leak.html