pub trait DataTransferItemMethods<D>where
    D: DomTypes,{
    // Required methods
    fn Kind(&self) -> DOMString;
    fn Type(&self) -> DOMString;
    fn GetAsString(&self, callback: Option<Rc<FunctionStringCallback<D>>>);
    fn GetAsFile(
        &self,
        _can_gc: CanGc,
    ) -> Option<Root<Dom<<D as DomTypes>::File>>>;
}