1<html xmlns="http://www.w3.org/1999/xhtml">
2<body>
3 <table>
4   <tr>
5      <td>x</td>
6      <td rowspan="4" colspan="4">y</td>
7   </tr>
8   <tr>
9      <td rowspan="0" colspan="0">z</td>
10      <td>w</td>
11   </tr>
12 </table>
13</body>
14</html>