Cloning elements and duplicating containers are what DFlex tries to avoid. Because the usual implementation is to clone the element (ghost it) and then append a

Cloning elements and duplicating containers are what DFlex tries to avoid. Because the usual implementation is to clone the element (ghost it) and then append a new one with a fixed position. The result is to reconstruct the DOM tree directly with every user interaction which leads to poor user experience and not a very practical transformation. That's why the default thing to do with DFlex is not to clone or change the element position unless there's a need to do so, for example: transforming from a container with a scroll.