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How to set a green background for even-numbered rows only? <table>     <tr>          <td>name</td>          <td>one</td>     </tr>      <tr>          <td>name</td>          <td>two</td>     </tr>      <tr>          <td>name</td>          <td>three</td>     </tr>      <tr>          <td>name</td>          <td>four</td>     </tr> </table>