"2">1</td>
          <td>3</td>
        </tr>
        <tr>
          <td colspan="2">2 and 3</td>
        </tr>
      </tbody>
    </table>
  </div><!--/span-->
</div><!--/row-->


<h4>Grid sizing</h4>
<div class="row">
  <div class="span12">
    <table class="table table-bordered">
      <thead>
        <tr>
          <th class="span3">1</th>
          <th class="span4">2</th>
          <th>3</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td colspan="2">1 and 2</td>
          <td>3