Merged cells in table

<table border="1">
  <thead>
    <tr>
      <th>category</th>
      <th>quantity</th>
      <th>spaces</th>
      <th>sizes</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td rowspan="3">bedroom</td>
      <td rowspan="3">2</td>
    </tr>
    <tr>
      <td>first</td>
      <td>5 FT</td>
    </tr>
    <tr>
      <td>second</td>
      <td>3 FT</td>
    </tr>
    <tr>
      <td rowspan="4">washroom</td>
      <td rowspan="4">3</td>
    </tr>
    <tr>
      <td>first</td>
      <td>5 FT</td>
    </tr>
    <tr>
      <td>second</td>
      <td>3 FT</td>
    </tr>
    <tr>
      <td>third</td>
      <td>3 FT</td>
    </tr>
    <tr>
      <td rowspan="2">something</td>
      <td rowspan="2">1</td>
    </tr>
    <tr>
      <td>first</td>
      <td>5 FT</td>
    </tr>
  </tbody>
</table>