<!DOCTYPE html>
<html>
<head>
  <style type="text/css" media="screen">
    #box {
        position: absolute;
        left: 0;
        top: 0;
        height: 100px;
        width: 100px;
        background-color: red;
        -webkit-animation-duration: 0.2s;
        -webkit-animation-timing-function: linear;
    }
    
    .move {
        -webkit-animation-name: move;
    }

    @-webkit-keyframes move {
        from { -webkit-transform: translateX(100px) scale(1); }
        to   { -webkit-transform: translateX(400px) scale(1); }
    }
    
    #safezone {
        position: absolute;
        left: 0;
        top: 0;
        height: 100px;
        width: 300px;
        left: 100px;
        background-color: green;
    }
  </style>
  <script type="text/javascript" charset="utf-8">
    if (window.testRunner)
        testRunner.waitUntilDone();
    
    function suspendAndWaitForCompletion()
    {
        if (window.internals)
            internals.suspendAnimations();

        window.setTimeout(function() {
            if (window.testRunner) {
                internals.resumeAnimations();
                testRunner.notifyDone();
            }
        }, 250);
    }
    
    function doTest()
    {
        document.getElementById('box').addEventListener('webkitAnimationStart', function() {
            suspendAndWaitForCompletion();
        }, false)

        document.getElementById('box').className = 'move';
    }

    window.addEventListener('load', doTest, false);
  </script>
</head>
<body>

<!-- When suspended, the red box should be hidden by the green box. You should see no red. -->
<div id="box"></div>
<div id="safezone"></div>

<div id="result"></div>

</body>
</html>