<table>
  <caption>
    Poster availability
  </caption>
  <col>
  <col>
  <colgroup span="3"></colgroup>
  <thead>
    <tr>
      <th scope="col">Poster name</th>
      <th scope="col">Color</th>
      <th colspan="3" scope="colgroup">Sizes available</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th rowspan="3" scope="rowgroup">Zodiac</th>
      <th scope="row">Full color</th>
      <td>A2</td>
      <td>A3</td>
      <td>A4</td>
    </tr>
    <tr>
      <th scope="row">Black and white</th>
      <td>A1</td>
      <td>A2</td>
      <td>A3</td>
    </tr>
    <tr>
      <th scope="row">Sepia</th>
      <td>A3</td>
      <td>A4</td>
      <td>A5</td>
    </tr>
  </tbody>
  <tbody>
    <tr>
      <th rowspan="2" scope="rowgroup">Angels</th>
      <th scope="row">Black and white</th>
      <td>A1</td>
      <td>A3</td>
      <td>A4</td>
    </tr>
    <tr>
      <th scope="row">Sepia</th>
      <td>A2</td>
      <td>A3</td>
      <td>A5</td>
    </tr>
  </tbody>
</table>