<!doctype html>
<html>
  <head>
    <meta charset="utf8">
  </head>
  <body>
    <table cellspacing="0" cellpadding="0" border="1">
      <colgroup><col span="2"></colgroup>
      <tbody>
        <tr>
          <td>a</td>
          <td>b</td>
        </tr>
        <tr>
          <td colspan="2">c</td>
        </tr>
        <tr>
          <td>d</td>
          <td rowspan="2">e</td>
        </tr>
        <tr>
          <td>f</td>
        </tr>
      </tbody>
    </table>
  </body>
</html>