Trait DataTransferItemListMethods 
Source pub trait DataTransferItemListMethods<D>{
    // Required methods
    fn Length(&self) -> u32;
    fn Add(
        &self,
        data: DOMString,
        type_: DOMString,
        _can_gc: CanGc,
    ) -> Result<Option<Root<Dom<<D as DomTypes>::DataTransferItem>>>, Error>;
    fn Add_(
        &self,
        data: &<D as DomTypes>::File,
        _can_gc: CanGc,
    ) -> Result<Option<Root<Dom<<D as DomTypes>::DataTransferItem>>>, Error>;
    fn Remove(&self, index: u32) -> Result<(), Error>;
    fn Clear(&self);
    fn IndexedGetter(
        &self,
        index: u32,
        _can_gc: CanGc,
    ) -> Option<Root<Dom<<D as DomTypes>::DataTransferItem>>>;
}