<!DOCTYPE html>

<html>
<head>
    <style>
        body {
            height: 2000px;
            width: 2000px;
            overflow: hidden;
        }
        
        .box {
            height: 300px;
            width: 300px;
            margin: 20px;
            margin-left: 10px;
            background-image: url('../resources/alpha-blocks.png');

            background-size: 500px 300px;
            background-repeat: no-repeat;
            background-attachment: fixed;
            box-shadow: 0 0 10px black; /* inflates composited bounds */
            border: 4px solid gray;
            float: left;
        }
        
        .composited {
            -webkit-transform: translateZ(0);
        }
    </style>
    <script>
        function doTest()
        {
            window.scrollTo(35, 45);
        }
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>

<div class="composited box"></div>
<div class="composited box"></div>

</body>
</html>