if you can guarantee that layouts don't change during interactions, i guess it _might_ save some time for the browser (and thus battery, for low power devices).
If layouts change during interaction (e.g., orientation swap), then you will have a roundtrip to the server to recalculate. I assume this would cost more time than letting the browser css engine do their thing.
If layouts change during interaction (e.g., orientation swap), then you will have a roundtrip to the server to recalculate. I assume this would cost more time than letting the browser css engine do their thing.