dom/tests/mochitest/whatwg/postMessage_chrome_helper.html


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<!DOCTYPE html>
<html>
<head>
  <title>postMessage chrome message receiver</title>
  <script type="application/javascript">
    var gPrePath = "";

    function receiveMessage(evt)
    {
      if (evt.data.substring(0,9) == "chrome://") {
        gPrePath = evt.data;
        respond("path-is-set");
      } else {
        // Content cannot post to chrome without privileges
        try {
          window.parent.postMessage("SHOULD NOT GET THIS!", "*");
        }
        catch (ex) {
        }

        var msg = "post-to-content-response";

        if (evt.source !== null)
          msg += " wrong-source(" + evt.source + ")";
        if (!evt.isTrusted)
          msg += " unexpected-untrusted-event";
        if (evt.type !== "message")
          msg += " wrong-type(" + evt.type + ")";
        if (evt.origin !== gPrePath)
          msg += " wrong-origin(" + evt.origin + ")";
        if (evt.data !== "post-to-content")
          msg += " wrong-message(" + evt.data + ")";

        respond(msg);
      }
    }
    
    function respond(msg)
    {
      SpecialPowers.wrap(window).parent.postMessage(msg, "*");
    }
    
    window.addEventListener("message", receiveMessage, false);
  </script>
</head>
<body>
<h1 id="domain">example.org</h1>
</body>
</html>