Assertions:
It is easy to abuse any of the methods of specifying frame sizes
to allow dimensions that are not equal to the parent frame size (while this can be
harmless, it could cause display problems.)
Frameset definition: rows="150,100"
Frameset definition: rows="800,1200"
Frameset definition: rows="150,*,100"
Frameset definition: rows="800,*,1200"