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Test Info:

<head>
<title>Check width of stretchy OverBar</title>
<style type="text/css">
html { background-color: grey; }
div { display: inline-block;
font-size: 30px;
line-height: 60px; /* Ensure space for underbar */
border: 1px solid white;
padding: 2px; /* 10% error allowed in char selection */
background-color: black;
color: black; }
</style>
</head>
<body>
<div>
<munder>
<mn>1</mn>
<mo>&#x332;</mo>
</munder>
</math>
</div>
</body>
</html>