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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>Stretchy mover</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
</head>
<body>
<!-- See bug 687807 -->
<math display=block>
<mrow>
<mspace width="10em"/>
<mrow>
<mover>
<mo stretchy="true">&#x2191;</mo>
<mn>B</mn>
</mover>
</mrow>
<mspace width="10em"/>
</mrow>
</math>
</body>
</html>