<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>postMessage closed page</title> <script type="application/javascript"> function receiveMessage(evt) { evt.source.postMessage("FAIL", "*"); } window.addEventListener("message", receiveMessage, false); function setup() { var query = location.search.substring(1); if (query == "opener") window.opener.postMessage("message", "http://mochi.test:8888"); } window.addEventListener("load", setup, false); </script> </head> <body> </body> </html>