third_party/web_platform_tests/html/browsers/browsing-the-web/unloading-documents/unload/009-1.html - cobalt - Git at Google

 <!doctype html>
 <script>
 onunload = parent.t.step_func(function() {parent.t.done()});
 </script>
	<!doctype html>
	<script>
	onunload = parent.t.step_func(function() {parent.t.done()});
	</script>