description

# onDragEnter property Null safety

ElementStream<MouseEvent> onDragEnter
override

A stream of `dragenter` events fired when a dragged object is first dragged over this element.

## Other resources

- Drag and drop sample based on the tutorial from HTML5Rocks.
- Drag and drop specification from WHATWG.

## Implementation

    ElementStream<MouseEvent> get onDragEnter => dragEnterEvent.forElement(this);