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chromium/third_party/blink/web_tests/paint/invalidation/line-flow-with-floats-3.html 

<body style="margin: 0;" onload="loaded()">
    <script src="resources/text-based-repaint.js"></script>
    <script src="resources/line-flow-with-floats.js"></script>
    <script>
        function test(doc)
        {
            doc.getElementById("greenFloat").style.width = "4em";
        }
    </script>
    <iframe onload="loaded()" id="iframe" src="resources/line-flow-with-floats.html" style="border: none; width: 500px; height: 600px;"></iframe>
</body>