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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-undefined-remove-crash.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/whatwg/html/issues/9459#issuecomment-1630466911">

<div id="po" popover>
PO
</div>

<script>
po.popover = undefined;
po.remove();
</script>