<table>
  <colgroup>
    <col span="2">
    <col class="selected">
  </colgroup>
  <tr>
    <th>ID</th>
    <th>Description</th>
    <th>Price</th>
  </tr>
  <tr>
    <td>1</td>
    <td>Computer</td>
    <td>$999</td>
  </tr>
  <tr>
    <td>2</td>
    <td>Tablet</td>
    <td>$499</td>
  </tr>
</table>

col.selected || td {
  background-color: lightyellow;
}