[Quoth]

Oh I have seen commercial ebooks using javascript.

Also stupid fixed layout epub3 that is more awkward than PDF. However that's nothing to do with javascript.


It may make sense to use javascript in epub3, but really creation and maintenance in the long term is no better than an app and app distribution will work to more users.

I'd like to see a reflowable epub version where footnotes don't need clicked, don't popup, and render on the same page as the source, like changing page size on the word processor. Also that no hand-coding is needed. Just a docx import. The epub2 should have had it.

1. Epub was developed for novels.

2. A mistake Web people taking over the spec prior to epub 3 as they were bound to add loads of stuff to try and compete with PDFs and apps, but lose sight of what books need.

I look forward to an epub4 with clear versions/indication of kind of thing the file is.