third_party/blink/web_tests/editing/execCommand/format-block-with-braces.html - chromium/src - Git at Google

 <!doctype html>
 <script src="../../resources/testharness.js"></script>
 <script src="../../resources/testharnessreport.js"></script>
 <script src="../assert_selection.js"></script>
 <script>
     test(() => assert_selection(
         '<div contenteditable>|Format Me</div>',
         'formatBlock <h1>',
         '<div contenteditable><h1>|Format Me</h1></div>'),
         'foramtBlcok accept tag name with html brackets');
 </script>
	<!doctype html>
	<script src="../../resources/testharness.js"></script>
	<script src="../../resources/testharnessreport.js"></script>
	<script src="../assert_selection.js"></script>
	<script>
	test(() => assert_selection(
	'<div contenteditable>\|Format Me</div>',
	'formatBlock <h1>',
	'<div contenteditable><h1>\|Format Me</h1></div>'),
	'foramtBlcok accept tag name with html brackets');
	</script>