<!DOCTYPE html>

<html>
<head>
    <style>
        .box {
          width: 100px;
          height: 100px;
          background-color: silver;
          border: 2px solid black;
          -webkit-box-reflect: below 5px;
        }
        
        .box.changed {
            background-color: orange;
        }
        
        .composited {
          -webkit-transform: translateZ(0);
        }
        
    </style>
    <script>
        if (window.testRunner)
            testRunner.waitUntilDone();

        function doTest()
        {
            window.setTimeout(function() {
                document.getElementById('box').classList.add('changed');
                if (window.testRunner)
                    testRunner.notifyDone();
            }, 0);
        }
        
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>

    <div id="box" class="composited box">
    </div>
</body>
</html>