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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var frame = document.createElementNS("http://www.w3.org/1999/xhtml", "iframe");
document.body.appendChild(frame);
var frameScreen = frame.contentWindow.screen;
document.body.removeChild(frame);
frameScreen.top;
}
</script>
</head>
<body onload="boom();"></body>
</html>