internal-set-lisp-face-attribute

internal-set-lisp-face-attribute is a built-in function in `C source code'.

(internal-set-lisp-face-attribute FACE ATTR VALUE &optional FRAME)

Set attribute ATTR of FACE to VALUE.
FRAME being a frame means change the face on that frame.
FRAME nil means change the face of the selected frame.
FRAME t means change the default for new frames.
FRAME 0 means change the face on all frames, and change the default
for new frames.