<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>rowspan transition</title>
</head>
<body>
<table><thead ><tr><td>td</td><td id="target" rowspan="2">x</td></tr><tr ><td rowspan="2">x</td></tr></thead></table>
</body>
</html>