1<html xmlns="http://www.w3.org/1999/xhtml"> 2<head> 3<style> 4.pad { padding: 100%; } 5</style> 6</head> 7 8<body> 9 10 <table> 11 <div class="pad">x</div> 12 <tr> 13 <td>a</td> 14 <td>b</td> 15 <div class="pad">c</div> 16 </tr> 17 </table> 18 19</body> 20 21</html> 22