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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
window.onload = function() {
document.removeChild(document.documentElement);
var oFrameset1 = document.createElement('frameset'),
oFrameset2 = document.createElement('frameset');
document.appendChild(oFrameset1);
oFrameset1.appendChild(oFrameset2);
oFrameset2.offsetWidth;
};
</script>
</head>
</html>