yes they do:
""" Deprecated: 3.16: This function is not useful in the context of CSS-based rendering. If you wish to change the way a widget renders its background you should use a custom CSS style, through an application-specific Gtk::StyleProvider <https://developer.gnome.org/gtkmm/stable/classGtk_1_1StyleProvider.html> and a CSS style class. You can also override the default drawing of a widget through the Gtk::Widget::signal_draw() <https://developer.gnome.org/gtkmm/stable/classGtk_1_1Widget.html#ab0a7d34fe7ae7a83fdb1e1ddd223e8f4>signal, and use Cairo <http://www.cairographics.org/documentation/cairomm/reference/namespaceCairo.html> to draw a specific color, regardless of the CSS style. """
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