<html>
<head>
<style>
html, body { 
    background: url() fixed;
}
</style>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

function runTest() {
    var range = document.createRange();
    range.setEnd(span, 1);
    range.extractContents();
    window.scrollBy(0, 100);
    document.body.style.display = "none";
}
</script>
</head>
<body onload=runTest()>
<span id=span>Pass if no crash or assert.</span>
</body>
</html>