chromium/src/third_party/blink/web_tests/external/wpt/portals/resources/portal-host-hidden-after-activation-portal.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <script>
   window.addEventListener("portalactivate", function(e) {
     var bc = new BroadcastChannel("portals-host-hidden-after-activation");
     bc.postMessage({ hasHost: !!window.portalHost });
     bc.close();
   });

   var bc = new BroadcastChannel("portals-host-hidden-after-activation");
   bc.postMessage({hasHost: !!window.portalHost });
   bc.close();

   window.portalHost.postMessage("loaded");
 </script>
	<!DOCTYPE html>
	<script>
	window.addEventListener("portalactivate", function(e) {
	var bc = new BroadcastChannel("portals-host-hidden-after-activation");
	bc.postMessage({ hasHost: !!window.portalHost });
	bc.close();
	});

	var bc = new BroadcastChannel("portals-host-hidden-after-activation");
	bc.postMessage({hasHost: !!window.portalHost });
	bc.close();

	window.portalHost.postMessage("loaded");
	</script>