<!DOCTYPE html>
<html>
<head>
<style type="text/css">
body { margin: 0px; }
#content {
width: 200px;
height: 1000px;
}
</style>
</head>
<body>
<div id="content"></div>
</body>
<script>
document.scrollingElement.scrollTop = "400";
top.debug("iframe's scroll top is " + document.scrollingElement.scrollTop);
top.postMessage("subframe-loaded", "*");
</script>
</html>