[nsonha]

re-read what being discussed, someone said to display epub you need to able to render HTML, I said "but it does NOT need to RUN js". And then you were the person who brought up implementation language which happens to be js, which is irrelevant to the point everyone was making.

[forgotpwd16]

The OG comment mentions JS codebase being bundled to a browser engine. Then it's mentioned that it makes sense to do that. And then you specifically asked "does it need a js engine though?". For this specific app, the answer is yes. You cannot open an epub directly on browser and you need to parse it to do that. That somehow for this app is JS. If your question was whether epubs may contain JS then it's wrongly posed.

[nsonha]

I replied to this comment

> Ebooks are basically HTML, so this is one case where bundling a browser engine is going to be necessary in any case.

and my point was contesting the statement that a full browser engine is necessary for displaying epub, the implementation language is not the point.