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Test Info:

<head>
<script>
function foo()
{
document.getElementById("mtr").appendChild(document.createTextNode("a"));
}
</script>
</head>
<body onload="foo()">
<div><math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mrow>↩ <mfenced open="[" close="]">↩ <mtable>↩ <mtr id="mtr">↩ <mtd><mi>x</mi></mtd>↩ <mtd><mi>y</mi></mtd>↩ </mtr>↩ </mtable>↩ </mfenced>↩</mrow>
</math></div>
</body>
</html>