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Test Info:

<head>
<script>
function boom()
{
document.getElementById("mo").appendChild(document.getElementById("mo2"));
document.body.offsetWidth;
document.getElementById("span").appendChild(document.createTextNode("baz"));
}
</script>
</head>
<body onload="boom();">
<p>Foo <math xmlns="http://www.w3.org/1998/Math/MathML"><mo id="mo2">-</mo></math></p>
<p><math xmlns="http://www.w3.org/1998/Math/MathML"><msub id="msub"><mo id="mo">+</mo></msub></math> <span id="span">bar</span></p>
</body>
</html>