elementFromPoint method returns the DOM node located at the coordinates x,y. This method is truly helpful when it comes to detecting a drop target. You simply get the node at the mouse position with
elementFromPoint at the coordinates the drop occured and walk up through the DOM tree untill you find a valid drop target. From a jQuery point of view, this means only using
$(nodeUnderPointXY).closest('myDropTargetSelector') on the node.