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chromium/third_party/blink/web_tests/shadow-dom/crashes/cyclic-detach-crash.html 

<!DOCTYPE html>
<script src='../../resources/testharness.js'></script>
<script src='../../resources/testharnessreport.js'></script>
<div id="a"><div id="host"><div id="child"></div></div></div>
<script>
test(() => {
  const a = document.querySelector('#a');
  const child = document.querySelector('#child');
  const host = document.querySelector('#host');

  const sr = host.attachShadow({ mode: 'open' });
  sr.appendChild(document.createElement('slot'));
  document.body.offsetLeft;
  child.remove();
  host.remove();
  a.appendChild(child);
  document.body.offsetLeft;
  child.appendChild(host);
  a.remove();
}, "crbug.com/849599. Cyclic detach should not happen.");
</script>