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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml"
class="reftest-wait">
<head>
<script>
function boom()
{
z = document.getElementById("z");
p = z.parentNode;
p.appendChild(z);
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="setTimeout(boom, 10)">
<p>
<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline">
<mi>x
<xul:scrollbar>
<xul:hbox>
<xul:hbox id="z">
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</xul:hbox>
</xul:hbox>
</xul:scrollbar>
</mi>
</math>
</p>
</body>
</html>