example-input-tables-colspan.html

<table>
  <thead>
    <tr>
      <th>Name</th>
      <th>Age</th>
      <th>Gender</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Person 1</td>
      <td>30</td>
      <td rowspan="2">M</td>
    </tr>
    <tr>
      <td>Person 2</td>
      <td>30</td>
    </tr>
    <tr>
      <td>Person 3</td>
      <td colspan="2">F</td>
    </tr>
  </tbody>
</table>