overflow:scroll and tables

Does anybody know any technical or formal reason of why 
following does not work in any (known to me) UA:

<table style="overflow:auto; width:100px; height:100px">
  ....
</table>

I mean no one UA shows scrollbars if table content overflows.

For illustrition of what scrollable table means:
http://www.terrainformatica.com/htmlayout/images/grid1.jpg

Just curious.

Thanks in advance,

Andrew Fedoniouk.
http://terrainformatica.com