anchor.diff:      Point draggablePosition = pageOffset(draggable);
       
       // Set the initial position of avatar.
  -    setLeftTop(draggablePosition);
  +    setTopLeft(draggablePosition);
       
       // Ensure avatar has an absolute position.
       avatar.style.position = 'absolute';
  
positive.code:     avatar.style.position = 'absolute';
      
      // Set the initial position of the original.
      setLeftTop(startPosition - mouseOffset);
    }
    
    @override
  
negative.code:   void dragEnd(Point startPosition, Point position) {
      // Remove the translate and set the new position as left/top.
      removeTranslate();
      setTopLeft(position - startPosition + _dragStartOffset);
      
      resetPointerEvents();
    }
  