It is quite difficult to see, what you expect to render from the code.
As there is no any neighbor rows and columns,
colspan="3" is optimized to
colspan="1". In standard scenarios, like below, colspans work correctly.
<table border=1 width=100 height=100>
<tr>
<td class="blank" colspan="3"> </td>
</tr>
<tr>
<td class="blank"> </td>
<td class="blank"> </td>
<td class="blank"> </td>
</tr>
</table>I Try This But This Not Working!