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<head>
<title>Check that UnderBar is visible when stretched</title>
<style type="text/css">
html { background-color: white; font-size: 50px }
mi { color: white; }
mo { color: black; }
</style>
</head>
<body>
<munder>
<mi>long</mi>
<mo>&#x332;</mo>
</munder>
</math>
</body>
</html>