-SPEC is stored as the saved value for FACE, as well as the value for the
-`user' theme. The `user' theme is one of the default themes known to Emacs.
-See `custom-known-themes' for more information on the known themes.
-See `custom-theme-set-faces' for more information on the interplay
-between themes and faces.
-See `defface' for the format of SPEC.
-
-If NOW is present and non-nil, FACE is created now, according to SPEC.
-COMMENT is a string comment about FACE."