DataTransferItem object represents 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
Documentation DataTransferItem by Mozilla Contributors, licensed under CC-BY-SA 2.5.
The kind of drag data item,
The drag data item's type, typically a MIME type.
File object associated with the drag data item (or null if the drag item is not a file).
Invokes the specified callback with the drag data item string as its argument.