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Originally Posted by SigilBear
Thanks, I'll check it out.
Af for Epub2 and Epub3, those are just different versions, right? My understanding is that it all began with Epub2 (or something even more primitive), but people are now creating Epub3 files.
Anyway, I've been saving all my projects as Epub3.
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Version 2 was the version that really gained momentum as e-book format. Version 3 is an evolved version, but it has been received with mixed feelings to say the least. It has some good parts and some bad parts. Especially the whole part with regards to Javascript and for some the audio/video part was unnecessary and will not work anyway on a e-ink reader. Some real gripes with version 2 were not addressed at all and stuff that almost nobody needed (I am looking at Apple here) got in.
All in all, ePUB3 did not take off as planned. Mainly because the support is lacking and it is only backwards compatible to a certain point. The reading application that support ePUB3 can read ePUB2, but not the other way round. So, a kind of mixed form has been created which has parts of 2 and parts of 3 and somewhat works. It is not ideal at all.
The most common approach nowadays is that if you need features in ePUB3, use ePUB3. Otherwise use version 2.
One additional thing, how is version two 'primitive'?