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Zoltan Lederer10,722 Points
I'd like to ask that in what situation is useful to use DOM manipulation? When we add/remove/modify any element (node), these are just temporary. So I don't understand the real purpose of it.
Steven Parker225,713 Points
The value of DOM manipulation is in making your pages interactive.
These techniques facilitate animation and responsive interaction to give your users a better experience. And it doesn't have to be temporary. If the dynamic changes are being made to representations of stored data, the final state can be sent back to the server to update the permanent storage.