<html>
<head>
    <script>
        function fireSentinel()
        {
            parent.postMessage("LOADED", "*");
            if (window.testRunner)
                testRunner.globalFlag = true;
        }
    </script>
</head>
<body onload="fireSentinel();">
    <p id='accessMe'></p>
    <p>Inner iframe.</p>
</body>
</html>