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<head>
    <script type="text/javascript">

        function test()
        {
            if (window.testRunner && window.internals) {
                testRunner.dumpAsText();
                internals.settings.setFrameFlattening("FullyEnabled")
            }
        }
    </script>
</head>
<body onload="test()">
    <div>
        <p>This test verifies that nested iframes do not cause assertion failure, when javascript is forcing layout. PASS if no assert in debug.</p>
    </div>
    <iframe src="data:text/html,
            <style>body { background-color: green; }</style>
            <body>
            <iframe src='data:text/html,
                <style>body { background-color: yellow; }</style>
                <body></body>' scrolling='no' height='50px' width='50px'></iframe>
            <script>document.body.offsetHeight</script>
            </body>" scrolling="no" height="100px" width="100px"></iframe>
     <script>document.body.offsetHeight</script>
</body>
</html>