modify-face
modify-face is an interactive compiled Lisp function in `faces.el
'.
(modify-face &optional FACE FOREGROUND BACKGROUND STIPPLE BOLD-P ITALIC-P UNDERLINE INVERSE-P FRAME)
Modify attributes of faces interactively.
If optional argument FRAME is nil or omitted, modify the face used
for newly created frame, i.e. the global face.
For non-interactive use, `set-face-attribute' is preferred.
When called from Lisp, if FACE is nil, all arguments but FRAME are ignored
and the face and its settings are obtained by querying the user.