Others have created CSS test ePub books posted here in MobileRead forums. I use them to evaluate readers and the results are pretty poor. Some apps just don't bother about CSS at all (AlReader), some overrule them heavily (Moon+), some omit text (PageTurner). ADE based reader apps render the books best (Aldiko), if you find the correct configuration options (Aldiko omits CSS by default). CoolReader is crashy, Pocketbook andriod app just choked on the first test ebook. I still stick to FBReader, but I check/modify the CSS in EVERY book I upload to my reader.
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