If I may. I see the point in creating an ePub3 over an app if one is interested in having some kind of "archival" quality. Even if no reader is capable of showing all the features as intended today, at least the specs are there and the code and markup will be available to be displayed in a future reader or converted (even if manually) to a future format. An app is disposable. Even if you keep/publish the source code, it will need a programmer to understand/convert it, an ePub3 can be more portable, but less usable in practice.
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