Both columns should be 200px
<table bgcolor=orange border>
 <colgroup span=2 width=200></colgroup>
 <tr>
  <td>c11</td><td>c12</td>
 </tr>
</table>
<BR>
Both columns should be 200px
<table bgcolor=orange border>
 <colgroup width=200>
   <col span=2>
 </colgroup>
 <tr>
  <td>c11</td><td>c12</td>
 </tr>
</table>
<BR>
Both columns should be 200px
<table bgcolor=orange border>
 <col width=200 span=2>
 <tr>
  <td>c11</td><td>c12</td>
 </tr>
</table>
<BR>