description

# dragStartEvent constant Null safety

EventStreamProvider<MouseEvent> const dragStartEvent

A stream of `dragstart` events for a dragged element whose drag has begun.

## Other resources

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

## Implementation

    static const EventStreamProvider dragStartEvent =
        const EventStreamProvider('dragstart')