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A person on another web forum posted their question (about code) multiple times at several different forums hoping to get a response to his question. That would be a wise way to start your JS/Epub questions quest, then watch and see which of several chat forum users offer the best answers, and focus your subsequent questions on that forum user group.
Read more about Web App (API server) vs Native App vs Hybrid apps (run in webview) vs (your goal) Epub/JS.
Native Apps (i.e. HTML-CSS-JS in a native application Java container wrapper distributed to App stores) can offer a 'better' place for JS code interactivity when compared against the challenges a coder may incur when JS is placed into an Epub3.
A builder tool example is Android SDK software, but the months long learning curve of SDK software would notably delay your goal.
Whereas pushing some minor JS into an Epub would likely be quicker (minus any coding bumps along the way which are inevitable), while still being market dependent (iOS/Kobo/etc).
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