It's a bit sad that at the beginning of mobi and epub that the there was no:
* popup notes. On most eReaders footnotes work badly.
* Rotten support for other than Roman-Latin, though it was solved already on UNIX, VMS, DOS in 1980s, never mind Windows & Linux and Mac in 1990s.
* Client side pure HTML image map (simple HTML, no java).
* Separate zoom on images and text
There is no reason why epub renderers can't do popup notes and zoom images like kepub, except most seem to be using Adobe (ADE?) and it's down the back of sofa income for them.
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