chromium/src/third_party/blink/web_tests/external/wpt/portals/resources/portals-nested-portal.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <body>
   <script>
     var portal = document.createElement("portal");
     portal.src = "simple-portal.html";
     portal.onload = e => window.portalHost.postMessage(e.data);
     document.body.appendChild(portal);
   </script>
 </body>
	<!DOCTYPE html>
	<body>
	<script>
	var portal = document.createElement("portal");
	portal.src = "simple-portal.html";
	portal.onload = e => window.portalHost.postMessage(e.data);
	document.body.appendChild(portal);
	</script>
	</body>