postMessage_closed_helper.html

Enable keyboard shortcuts

<!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);

function setup()

  var query = location.search.substring(1);

  if (query == "opener")

    window.opener.postMessage("message", "http://mochi.test:8888");

window.addEventListener("load", setup);

  </script>

</head>

<body>

</body>

</html>