css 合並行 和並列 colspan , rowspan

<table border="1" width="100" height="100">
<tr>
<td colspan="2">sv</td>
<td>ddddd</td>
</tr>
<tr>
<td rowspan ="2" colspan="2">ssss</td>




<td rowspan ="2">ggg</td>




</tr>
</table>