Let's assume I have a table like this:

aaa bbb ccc ddd
---------------
123 ... ... ...
456 ... ... ...
789 ... ... ... 

but due to formatting constraints I want to print it like this:

aaa | 123 456 789
bbb | ... ... ...
ccc | ... ... ...
ddd | ... ... ...

Is there a way to do this in CSS?

No, tables in CSS and HTML have a fixed orientation, and would need a script or XSLT to transpose them.

Pity. Thanks.