third_party/blink/web_tests/fast/parser/frameset-in-fragment.html - chromium/src - Git at Google

 <!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>
	<!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>