Binary package “libgtk-3-doc” in ubuntu lunar

documentation for the GTK graphical user interface library

 GTK is a multi-platform toolkit for creating graphical user
 interfaces. Offering a complete set of widgets, GTK is suitable
 for projects ranging from small one-off tools to complete application
 suites.
 .
 This package contains the HTML documentation for the GTK library
 in /usr/share/doc/libgtk-3-doc/ .