Example: colgroup element with span attribute

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<!DOCTYPE html><html>  <body>    <h1>colgroup element with span attribute example</h1>​    <table>      <colgroup span="2" style="background: red"></colgroup>      <tr>        <th>Heading 1</th>        <th>Heading 2</th>        <th>Heading 3</th>      </tr>      <tr>        <td>CELL</td>        <td>CELL</td>        <td>CELL</td>      </tr>    </table>  </body></html>​

Further information:

HTML <colgroup> Tag