third_party/web_platform_tests/html/browsers/browsing-the-web/navigating-across-documents/child_navigates_parent_submit-2.html - cobalt - Git at Google

 <!doctype html>
 <form action="child_navigates_parent_submit-3.html" target="_parent"></form>
 <script>
 parent.parent.postMessage("inner", "*");
 document.forms[0].submit()
 </script>
	<!doctype html>
	<form action="child_navigates_parent_submit-3.html" target="_parent"></form>
	<script>
	parent.parent.postMessage("inner", "*");
	document.forms[0].submit()
	</script>