<!DOCTYPE html>

<html>
<head>
    <style>
        .box {
          width: 100px;
          height: 100px;
          background-color: silver;
        }
        
        .container {
            -webkit-perspective: 500px;
            width: 300px;
            padding: 10px;
        }
        
        #flipper {
            width: 300px;
            height: 300px;
            -webkit-transform-style: preserve-3d;
        }
        
        #flipper > div {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }
        .flipping {
            -webkit-animation: flip 2s forwards;
        }
        
        .front, .back {
            -webkit-backface-visibility: hidden;
        }
        
        .back {
            -webkit-transform: rotateY(180deg);
        }
        
        @-webkit-keyframes flip {
            to { -webkit-transform: rotateY(0); }
            to { -webkit-transform: rotateY(180deg); }
        }
    </style>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }

        function doTest()
        {
            window.setTimeout(function() {
                var flipper = document.getElementById('flipper');
                flipper.addEventListener('webkitAnimationStart', testDone, false);
                flipper.classList.add('flipping');
            }, 250);
        }
        
        function testDone()
        {
            var layersResult = document.getElementById('layers');
            if (window.testRunner) {
                layersResult.innerText = window.internals.layerTreeAsText(document);
                testRunner.notifyDone();
            }
        }
        window.addEventListener('load', doTest, false)
    </script>
</head>
<body>
    <div class="container">
        <div id="flipper">
            <div class="front box">
                Front
            </div>
            <div class="back box">
                Back
            </div>
        </div>
    </div>
<pre id="layers"></pre>
</body>
</html>