*** Custom support
The variables font-lock-face-attributes, font-lock-display-type and font-lock-background-mode are now obsolete; the recommended way to specify the faces to use for Font Lock mode is with M-x customize-group on the new custom group font-lock-highlighting-faces. If you set font-lock-face-attributes in your ~/.emacs file, Font Lock mode will respect its value. However, you should consider converting from setting that variable to using M-x customize.

You can still use X resources to specify Font Lock face appearances.