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HTML5 + CSS5 + SVG (and maybe even MathML, I don't remember)
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For many books with simple markup going to html5 should not make a big difference, of course once additional formerly unsupported html5-possibilities are applied, the problems start. a lot of that relates to multimedia and video an audio-features would not work on the KT anyway. CSS in epub3 supports CSS 3 (probably just a typo) and MathML-support is also included...
I definitely agree, that this should be a one-step-upgrade, probably it would even be best to detect the epub-version and use seperate interpreters for each version...
What I meant with the fallback is that it was probably attempted to design epub3 in a way so that epub2-interpreters would allow me to use them at least on a basiv level. But then I tried opening an epub3 in Sigil and it doesnt open it at all. Calibre opens it just fine and will probably do a good job in converting 3 to 2 for incompatible devices...