Why the break tag<br/> Is used here in table data or table column?

Question

<table border="2">
<tr>
<td>Red</td>
<td>Blue</td>
<td>Green</td>
</tr>
<tr>
<td><br /></td>
<td colspan="2"><br /></td>
</tr>
</table>

Answer 1

To give an explicit empty content to the cell: you can replace it with the non breakable space '&nbsp;' which product quite same...

It's because default behaviour of empty <td>s elements is to not be displayed if empty content (meaning including normal spaces and normal line breaks in html context).