<!DOCTYPE HTML>
<html>
<body>
<table>
  <col style="background: lime"></col>
  <tr><td style="width:100px; height:100px;"></td></tr>
</table>
<table>
  <colgroup style="background: lime"></colgroup>
  <tr><td style="width:100px; height:100px;"></td></tr>
</table>
</body>
</html>