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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var mo = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mo");
var t1 = document.createTextNode("123456 ");
mo.appendChild(t1);
document.body.appendChild(mo);
var t2 = document.createTextNode("x");
document.body.appendChild(t2);
var r1 = document.createRange();
r1.setEnd(t1, 7);
var r3 = document.createRange();
r3.setStart(t1, 7);
document.documentElement.offsetHeight;
var r2 = document.createRange();
r2.setStart(t1, 0);
r2.setEnd(t2, 0);
r2.deleteContents();
}
</script>
</head>
<body onload="boom();"></body>
</html>