For those not already know,
Standard Ebooks is a site that takes public domain works from sources like Project Gutenburg and makes them nicely formatted. Check them out if you're into that kind of thing.
With that out of the way:
All their books have these options (and their descriptions):
Quote:
Compatible epub - All devices and apps except Kindles and Kobos.
azw3 - Kindle devices and apps. Also download the Kindle cover thumbnail to see the cover in your Kindle’s library.
kepub - Kobo devices and apps.
Advanced epub - An advanced format not yet fully compatible with most ereaders.
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Does anybody know exactly what the "advanced epub" is?
this page mentions that a Chrome extension called Readium uses them, but the Readium page doesn't really give any indication of what it offers other than viewing ePubs in Chrome.