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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function boom()
{
document.setUserData('key', {}, null);
// Depending on the pref bidi.direction, one of these will hit the page scrollbar.
window.cpRight = document.caretPositionFromPoint(window.innerWidth - 1, 0);
window.cpLeft = document.caretPositionFromPoint(0, 0);
}
</script>
</head>
<body onload="boom();">
<div style="height: 50000px;"></div>
</body>
</html>