<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
#q:after {
content: 'A';
}
</style>
</head>
<body>
<mrow xmlns="http://www.w3.org/1998/Math/MathML"></mrow>
<span id="q"><span><div></div></span></span>
</body>
</html>