How to show row have spacing in html?

Question

My Code is......

<table>
  <tr>
    <td>1</td>
    <td>2</td>
  </tr>
  <tr>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td>3</td>
    <td>4</td>
  </tr>
</table>

Row two doesn't show. How can I do it?

Answer 1

<table border="1">
  <tr>
    <td>1</td>
    <td>2</td>
  </tr>
  <tr>
    <td > &nbsp</td>
    <td >&nbsp</td>
  </tr>
  <tr>
    <td>3</td>
    <td>4</td>
  </tr>
</table>

Answer 2

Have you tried adding <td>&nbsp;</td> ?