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chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/the-dialog-element/showmodal-in-shadow-crash.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=850664">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=851384">

<div id="dialog">
  <div id="item"></div>
</div>
<script>
const itemRoot = item.attachShadow({mode: 'open'});
const dialogRoot = dialog.attachShadow({mode: 'open'});
dialogRoot.innerHTML = '<dialog><slot></slot></dialog>';
dialog.offsetTop;
dialogRoot.firstChild.showModal();
</script>