Activates the #WebKitOptionMenuItem at @index in @menu. Activating an item changes the value
of the element making the item the active one. You are expected to close the menu with
webkit_option_menu_close() after activating an item, calling this function again will have no
effect.
Activates the #WebKitOptionMenuItem at @index in @menu. Activating an item changes the value of the element making the item the active one. You are expected to close the menu with webkit_option_menu_close() after activating an item, calling this function again will have no effect.