<head>
<style>
    #div {
        width: 200px;
        height: 200px;
        background-image:url(resources/bikes.bmp); 
        -webkit-background-size: 50% 100%;
    }
</style>
</head>

<body>

<div id='pass'>Failed! This test should not crash, and this text should be changed to a passing message.</div>
<div id='div'></div>

<script>
    var div = document.getElementById('div');
    var style = document.defaultView.getComputedStyle(div);
    var valueList = style.getPropertyCSSValue('-webkit-background-size');
    var one = valueList.item(100);

    var pass = document.getElementById('pass');
    pass.innerHTML = 'PASS! This test passes if it does not crash.';
</script>
</body>