<html>
<head>
<style>
body {
height:2000px;
margin:0;
overflow:hidden;
}
#fixed-background-box {
position: absolute;
top: -100px;
width:400px;
height:600px;
background-image: linear-gradient(blue, blue 10px, green 10px, green 490px, black 490px, black);
background-attachment:fixed;
background-repeat:no-repeat;
</style>
<script>
function runTest() {
if (window.internals)
window.internals.setTopContentInset(100);
window.addEventListener('load', runTest, false);
</script>
</head>
<body>
<div id="fixed-background-box"></div>
</body>
</html>
