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I'd regard any App that < item below> as bad:
1) can't do embedded fonts
2) ignores the justification settings in CSS
3) ignores Page Break before
4) Has no NCX
5) Links not supported
6) Ignores left, right, top or bottom paragraph css margins
7) Ignores first line indent.
Virtually every ereader ever, does all of those except embedded fonts. Only prehistoric Kindles (Before KK3 and the DXG and earlier except KK3) don't do the fonts.
Lithium and Aldiko Classic seem to work similarly to epub2 on any Kobo or Nook since at least the Touch and Simple Touch.
Some of the Binatone LCD ereaders and the iRiver Cover Story need the ebook (or Calibre created sub-directories in a specific directory, usually Digital Editions or related for fonts and CSS to work. The Boyue Likebook Mars stock reader is OK for PDFs, but KOReader is needed for decent epub support.
I think I've tested about 15 different models of dedicated ereaders and many apps on Android (4.3" to 10" screens, Android 4.x to 8.x) and two apps on the Palm PDA (which is as abysmal as you'd imagine with 160x160 pixels and older than mobi ebook formats).
Two Sony (I have 5" PRS350, tested a T1)
Three Kobo (I own two kinds now)
Maybe seven different Kindles (I own three different kinds) inc PW4 and ancient ones with KF7-mobi only.
Maybe three different LCD based Binatone eReaders, one was Android 2.x! I've only kept one as a curio.
The Kindle, Kobo and Google Books Playstore Apps for Android seem OK on Android 8.x. Our books look about the same as on a Kobo eInk or even the PW3 in Publisher mode* The Belinda Borrowbox App for our local Libraries is terrible. But the alternative is a PC download and Adobe DRM and I've not got the Adobe program on Linux, only on an ancient XP gaming machine not used on the Internet.
iRiver Cover Story (Screen cracked at rear due to battery swelling).
* Curiously the KK3 (only 167 dpi) in KF8-Publisher mode seems to render a bit more accurately like a 300 dpi Kobo than the PW3, especially with images. Oddly the PW3 makes some of them bigger rather than the same relative screen width or smaller. The KK3 even in KF7-mobi mode is better than the DXG because the KK3 has more built in fonts in FW and the stock DXG serif font is not very pretty IMO.
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