<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>rowspan transition</title> </head> <body onload="document.getElementById('target').setAttribute('rowspan',2);"> <table><thead ><tr><td>td</td><td id="target" rowspan="0">x</td></tr><tr ><td rowspan="2">x</td></tr></thead></table> </body> </html>