<table style="height:200px" border=1>
 <tr>
  <td>
   <table height=100% class="sized" border=1>
    <tr>
         <td height=30%>
      <table height=100% class="sized" border=1>
       <tr>
            <td height=30%>30%</td>
           </tr>
       <tr>
            <td height=70%>70%</td>
           </tr>
      </table>
         </td>
        </tr>
    <tr>
         <td height=70%>70%</td>
        </tr>
   </table>
  </td>
 </tr>
</table>