One drag data item. During a drag operation, each drag event has a dataTransfer property which contains a list of drag data items. Each item in the list is a DataTransferItem object.
Returns the drag data item kind, one of: "string", "file".
Returns the drag data item type string.
Returns a File object, if the drag data item kind is File.
Invokes the callback with the string data as the argument, if the drag data item kind is Plain Unicode string.
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