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Test Info:

<!DOCTYPE html>
<!-- Test for crash when inert br gains illegal child -->
<html>
<dialog></dialog>
<br>
<script>
requestAnimationFrame(() => {
requestAnimationFrame(() => {
document.querySelector('dialog').showModal();
const br = document.querySelector('br');
br.appendChild(document.createElement('fieldset'));
});
});
</script>
</html>