Ev.Data_transferSourceDataTransfer objects.
The type for DataTransfer objects.
drop_effect d is the dropEffect property.
set_drop_effect d e sets the drop_effect property to e. Note. Only a subset of Effect.t can be used.
effect_allowed d is the effectAllowed property.
set_effect_allowed d e sets the effect_allowed property to e.
items d is the items property.