Ian Hickson wrote:
In general the drag and drop section is intended for dragging and dropping data (as in copy and paste). For dragging of UI elements, I recommend using the mouse events. HTML5, CSSOM, or the DOM Events spec will probably gain a method to allow mouse capturing, so that you can determine whether the element is being dragged out of its container.
So not feasible for the time being, I was right. The mouse capture API is mandatory in my case. Thanks Hixie. </Daniel>