[source](https://www.w3.org/WAI/tutorials/tables/irregular/) <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>
source