Most german ereaders are Adobe Digital Edition-based. Since ADE still doesn't support media queries and other epub3 functions, they won't work on the readers aswell. Which makes the production of an epub a pain. Will the program ever be developed further or is Adobe simply not interested in that market?
Are there any specs of the program itself to find, what is supported and what not? Working with trial and error takes a lot of time which I'd rather spent elsewhere.