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Test Info:

<!DOCTYPE html>
<link rel="author" href="mailto:caseq@chromium.org">
<link rel="help" href="https://crbug.com/384233287">
<body>
<iframe src="about:blank"></iframe>
<script>
const part_root = frames[0].document.getPartRoot();
document.getElementsByTagName("iframe")[0].remove();
part_root.clone();
</script>
</body>