gecko-dev/dom/base/test/test_messageChannel.xul

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<?xml version="1.0"?>
<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
<window title="Test for MessageChannel API"
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
<!-- test results are displayed in the html:body -->
<body xmlns="http://www.w3.org/1999/xhtml" id="body">
</body>
<!-- test code goes here -->
<script type="application/javascript"><![CDATA[
ok("MessageChannel" in window, "Should MessageChannel exist?");
var channel = new MessageChannel();
ok(channel, "MessageChannel is created");
channel.port1.onmessage = function(evt) {
ok(true, "message received!");
SimpleTest.finish();
}
var ifr = document.createElement('browser');
ifr.setAttribute("src", "http://mochi.test:8888/tests/dom/base/test/iframe_messageChannel_chrome.html");
ifr.setAttribute("flex", "1");
ifr.addEventListener('load', function() {
ifr.contentWindow.postMessage(channel.port2, '*', [channel.port2]);
});
var body = document.getElementById("body");
body.appendChild(ifr);
SimpleTest.waitForExplicitFinish();
]]></script>
</window>