<html xmlns="http://www.w3.org/1999/xhtml" xmlns:math="http://www.w3.org/1998/Math/MathML">
<head>
<style>
/*
This testcase uses [class~="foo"] instead of .foo to work around bug 276267
(see bug 379178 comment 78)
*/
[class~="abs"] { position: absolute; }
[class~="marg"] { margin: 1em; }
[class="noheight"] { height: 0; }
</style>
</head>
<body>
<math:mrow class="noheight">
<span class="abs">
<math:mroot class="abs marg" />
<span class="abs" />
</span>
</math:mrow>
</body>
</html>