I would like to know if it's possible, in a table where width=100%, and where each column width are % value, to get for the last column a fixed width?
If yes how?
The short answer would be no, not with CSS in a simple way. It is quite troublesome to mix fixed and relative width for obvious reasons.
There is however a new CSS3 feature calc()
that can be used to let the browser calculate the proper width.
Notice Unfortunately it is still just experimental, and has limited browser support.