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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
document.documentElement.scrollTop = "500";
o1 = document.createRange();
o2 = document.createElement('input');
o1.selectNode(document.documentElement);
o1.surroundContents(o2);
o2.selectionStart;
</script>
</head>
<body></body>
</html>