<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <head><title>border collapse dynamic change to table border width</title> <style> td { border: 10px green solid;} table {margin: 30px} </style> </head> <body> <table style="border-collapse:collapse; border:solid green 20px"> <colgroup><col></colgroup> <colgroup><col></colgroup> <colgroup><col></colgroup> <tbody></tbody><tr><td>c11</td><td>c12</td><td>c13</td></tr></tbody> <tbody> <tr><td>c21</td><td>c22</td><td>c23</td></tr> </tbody> <tbody> <tr><td>c31</td><td>c32</td><td>c33</td></tr> </tbody> </table>