Does opacity:0 have exactly the same effect as visibility:hidden

Question

If so, does it effectively deprecate the visibility property?

(I realize that Internet Explorer does not yet support this CSS2 property.)
Comparis

Answer 1

I'm not entirely sure of this, but I think screen readers don't read things that are set to visibility hidden, but they may read things regardless of their opacity.

That's the only difference I can think of.