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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<title>mfrac linethickness</title>
<script type="text/javascript">
function doTest() {
document.getElementById("testMfrac").setAttribute("linethickness","thick");
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate",doTest);
</script>
</head>
<body>
<math>
<mfrac id="testMfrac" style="font-size: 300%">
<mi> a </mi>
<mi> b </mi>
</mfrac>
</math>
</body>
</html>