Besides, the topic is future proofing your books - ie making sure they can be read on future devices that use ePub3. We should never disregard innovation just because there are some people living in the past- can you imagine a world with no cars because the gas hose wouldn't fill up the horse?!?
The goal is to allow the use of new technology/techniques - while still letting the older devices function... even if that functionality is extremely limited when compared to the newer model!
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