called when the mouse pointer has been moved out of the drop area
| source | HTMLElement | a source HTML object |
| target | HTMLElement | a target HTML object |
| drop | HTMLElement | a new DOM element which will be used as a drop target (can be null) |
| event | Event | a native HTML object |
Also defines the marker behavior out of the drop area.
The drop element can be different from the target one.
Back to top