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.OptionMenu.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.OptionMenu.close after activating an item, calling this function again will have no effect.