In the following example, the outer FRAMESET divides the available space into two equal columns.
The inner FRAMESET then divides the second area into two rows of unequal height.
<.. FRAMESET cols="33%, 33%>
...contents of first frame...
<.. FRAMESET rows="40%, 50%">
...contents of second frame, first row...
...contents of second frame, second row...
...contents of third frame...
/FRAMESET
entire html source