custom-set-faces is a compiled Lisp function in `cus-face.el'.

(custom-set-faces &rest ARGS)

Apply a list of face specs for user customizations.
This works by calling `custom-theme-set-faces' for the `user'
theme, a special theme referring to settings made via Customize.
The arguments should be a list where each entry has the form:


See the documentation of `custom-theme-set-faces' for details.