postMessage_throw_helper.html

Enable keyboard shortcuts

<!DOCTYPE html>

<html>

<head>

  <title>postMessage throwing page</title>

  <script type="application/javascript">

    function receiveMessage(evt)

      throw 17;

    window.addEventListener("message", receiveMessage);

    function setup()

      var target = document.getElementById("location");

      target.textContent = location.hostname + ":" + (location.port || 80);

    window.addEventListener("load", setup);

  </script>

</head>

<body>

<h1 id="location">No location!</h1>

</body>

</html>