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Test Info:

<head>
<script>
<![CDATA[
function boom()
{
document.getElementById("i").selectionEnd;
document.getElementById("a").appendChild(document.getElementById("b"));
}
]]>
</script>
</head>
<body onload="boom();">
<mrow xmlns="http://www.w3.org/1998/Math/MathML" id="a"><mrow id="b"/><input xmlns="http://www.w3.org/1999/xhtml" id="i" /></mrow>
</body>
</html>