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Test Info:

<!DOCTYPE html>
<link rel=author href="mailto:luke@warlow.dev">
<link rel=author href="mailto:masonf@chromium.org">
<!-- This test passes if it does not crash. -->
<dialog id="dialog" open>Dialog</dialog>
<script>
window.onload = () => dialog.setAttribute('closedby', 'closerequest');
</script>