"Themes that have been defined with `deftheme'.
The default value is the list (user standard). The theme `standard'
contains the Emacs standard settings from the original Lisp files. The
-theme `user' contains all the the settings the user customized and saved.
+theme `user' contains all the settings the user customized and saved.
Additional themes declared with the `deftheme' macro will be added to
the front of this list.")