Gtk.Widget.prototype.set_style

function set_style(style:Gtk.Style):void {
    // Gjs wrapper for gtk_widget_set_style()
}

Used to set the Gtk.Style for a widget (widget->style). Since GTK 3, this function does nothing, the passed in style is ignored.

style: a Gtk.Style, or null to remove the effect of a previous call to Gtk.Widget.prototype.set_style and go back to the default style