gtk:text-tag-background (object)

object -- a gtk:text-tag object
background -- a string for the background color

The accessor for the background slot of the gtk:text-tag class sets the background color as a string. The background property is not readable, but writable.

(defvar tag (gtk:text-tag-new nil)) => TAG
(setf (gtk:text-tag-background tag) "red") => "red"
(gtk:text-tag-background-rgba tag)
=> #S(GDK:RGBA :RED 1.0 :GREEN 0.0 :BLUE 0.0 :ALPHA 1.0)