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Test Info:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<head>
<title>Testcase for bug 414123</title>
<script>
function boom() {
var t = document.createTextNode('M')
document.getElementById('mi1').appendChild(t);
var mi = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mi");
var mn = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mn");
var msup = document.createElementNS("http://www.w3.org/1998/Math/MathML", "msup");
mi.appendChild(document.createTextNode('M'));
mn.appendChild(document.createTextNode('2'));
msup.appendChild(mi);
msup.appendChild(mn);
document.getElementById('m').appendChild(msup);
}
</script>
</head>
<body onload="boom()">
<msup>
<mi id="mi1"></mi>
<mn>2</mn>
</msup>
</math>
<msup>
<mi>M</mi>
<mn>2</mn>
</msup>
</math>
<math id="m" xmlns="http://www.w3.org/1998/Math/MathML"></math>
</body>
</html>