Expand a div to fill the remaining width

Question

I want a two-column div layout, where each one can have variable width e.g.

Answer 1

This would be a good example of something that's trivial to do with tables and hard (if not impossible, at least in a cross-browser sense) to do with CSS.

If both the columns were fixed width, this would be easy.

If one of the columns was fixed width, this would be slightly harder but entirely doable.

With both columns variable width, IMHO you need to just use a two-column table.