description

# onDragStart property Null safety

ElementStream<MouseEvent> onDragStart
override

A stream of `dragstart` events fired when this element starts being dragged.

## Other resources

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

## Implementation

    ElementStream<MouseEvent> get onDragStart => dragStartEvent.forElement(this);