// https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist
[Exposed=Window]
interface DataTransferItemList {
    readonly attribute unsigned long length;
    getter DataTransferItem (unsigned long index);
    DataTransferItem? add(DOMString data, DOMString type);
    DataTransferItem? add(File data);
    undefined remove(unsigned long index);
    undefined clear();
};
