Div na pełnej wysokości TD
<table border="1" style="height:300px; width: 100px;">
<tr><td>cell1</td><td>cell2</td></tr>
<tr>
<td style="height: 1px"> <!-- or 100% -->
<div style="height: 100%; width: 100%; background-color:pink;"></div>
</td>
<td>long text long text long text long text long text long text</td>
</tr>
</table>
It's Draqula