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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">↩
<head>↩
<title>munderover@accentunder</title>↩
<meta charset="utf-8"/>↩
<script type="text/javascript">↩
function doTest() {↩
document.getElementById('mathOperator').setAttribute('accentunder', 'true');↩
document.documentElement.removeAttribute("class");↩
}↩
window.addEventListener("MozReftestInvalidate",doTest);↩
</script>↩
</head>↩
<body>↩
<math>↩
<munderover id="mathOperator"><mtext>X</mtext><mo>O</mo><mo>O</mo></munderover>↩
</math>↩
</body>↩
</html>