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Test Info:

<head>
<script>
function foo()
{
var mo = document.getElementById("mo");
mo.removeChild(mo.firstChild);
}
</script>
</head>
<body onload="foo();">
<div><math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mrow>
<mi>x</mi>
<mo id="mo">=</mo>
<mi>y</mi>
</mrow>
</math></div>
</body>
</html>