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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<title>mfrac childnode update</title>
<script type="text/javascript">
function doTest() {
var x = document.getElementById("innerMfrac");
var y = document.createElementNS("http://www.w3.org/1998/Math/MathML","mi");
var z = document.createElementNS("http://www.w3.org/1998/Math/MathML","mi");
y.innerHTML = "c";
z.innerHTML = "d";
x.appendChild(y);
x.appendChild(z);
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate",doTest);
</script>
</head>
<body>
<math>
<mfrac style="font-size: 300%">
<mfrac>
<mi> a </mi>
<mi> b </mi>
</mfrac>
<mfrac id="innerMfrac">
</mfrac>
</mfrac>
</math>
</body>
</html>