On second thought, the spec says items.length "Returns the number of items in the drag data store.": https://html.spec.whatwg.org/multipage/dnd.html#the-datatransferitemlist-interface The MDN page for items says: "The read-only DataTransfer property items property is a list of the data transfer items in a drag operation. The list includes one item for each item in the operation and if the operation had no items, the list is empty." https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer/items This api seems rather ambiguous about this.
Bug 1683460 Comment 7 Edit History
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On second thought, the spec says items.length "Returns the number of items in the drag data store.": https://html.spec.whatwg.org/multipage/dnd.html#the-datatransferitemlist-interface The MDN page for items says: "The read-only DataTransfer property items property is a list of the data transfer items in a drag operation. The list includes one item for each item in the operation and if the operation had no items, the list is empty." https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer/items This api seems rather ambiguous, the naming does not help either.