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chromium/third_party/blink/web_tests/fast/parser/frameset-in-fragment.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
document.getElementsByTagName('html')[0].insertAdjacentHTML('afterbegin', '<p><frameset></frameset></p>');
test(() => {}, "Forced body tag insertion in a fragment shouldn't crash on frameset");
</script>