Is Default face a per frame attribute or a global one?

[Alexandros Prekates]

Continuing little experiments to better undestand the relation among 
fonts, faces, frames etc, i noticed
that  if i have 2 frames (A and B) and  i evaluate from ielm in frame A 
(set-frame-font "liberation serif" nil nil) . when i check the default 
face's font i see different values in frame A from frame B.

So it seems that default face is a frame's variable.

i mean every frame has its own default face? Is that right?

Alexandros