Using itextsharp xmlworker to convert html to pdf and write text vertically

Is there possible to achieve writing text direction bottom-up in xmlworker? I would like to use it in table. My code is

     <table border=1>
     <tr>
     <td style="padding-right:18px">
          <p style="writing-mode:sideways-lr;text-align:center">First</p</td>
     <td style="padding-right:18px">
          <p style="writing-mode:sideways-lr;text-align:center">Second</p></td></tr>
     <tr><td><p style="text-align:center">1</p>  </td>
         <td><p style="text-align:center">2</p></td> 
     </tr>
        </table>

But it it doesn't work after conversion from html to pdf. Text FIRST and SECOND are not in direction bottom-to-up.