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Test Info:

<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<table>foo</table>
<details open=true>
<dialog open=true>
<table>
<tr></tr>
</table>
</dialog>
</details>
<script>
const dialog = document.querySelector('dialog');
dialog.close();
dialog.showModal();
const cell = document.querySelector('tr').insertCell();
document.querySelector('details').appendChild(cell);
document.body.attachShadow({mode: 'closed'});
</script>