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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>negative mspace</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
</head>
<body>
<p>
<math>
<mrow>
<mspace width="2em" height="1em" mathbackground="red"></mspace>
<mspace width="-1em"/>
<mspace width="1em" height="1em" mathbackground="blue"></mspace>
</mrow>
</math>
</p>
<p>
<math dir="rtl">
<mrow>
<mspace width="2em" height="1em" mathbackground="red"></mspace>
<mspace width="-1em"/>
<mspace width="1em" height="1em" mathbackground="blue"></mspace>
</mrow>
</math>
</p>
</body>
</html>