pub trait IDBOpenDBRequestMethods<D>where
    D: DomTypes,{
    // Required methods
    fn GetOnblocked(&self) -> Option<Rc<EventHandlerNonNull<D>>>;
    fn SetOnblocked(&self, value: Option<Rc<EventHandlerNonNull<D>>>);
    fn GetOnupgradeneeded(&self) -> Option<Rc<EventHandlerNonNull<D>>>;
    fn SetOnupgradeneeded(&self, value: Option<Rc<EventHandlerNonNull<D>>>);
}