gtk:menu-item, gtk:bin, gtk:container, gtk:widget, gtk:buildable, gtk:activatable, gobject:object, common-lisp:standard-object, common-lisp:t

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The gtk:separator-menu-item widget is a separator used to group items within a menu. It displays a horizontal line with a shadow to make it appear sunken into the interface. The gtk:separator-menu-item implementation has a single CSS node with name separator.