As you noted with Moon+, quite a few Android renderers go their own way and do their own thing. Basically for ePubs that I create, I test on several programs (ADE in several versions and Thorium are the main ones under Windows, Kobo and Pocketbook on mobile devices) and on a couple of hardware eInk ePub ereaders. I also convert to Amazon's AZW3 format and check how that works on Kindles apps and a Kindle eInk device.
I've tested on several Android ePub renderers set to use publisher CSS and the results have been non-optimal (looks like crap might be a better way to phrase it).
Please note that if you use ePub 3, there are quite a few renderers and devices that still do not handle enough of the ePub 3 spec to look good. For the most part, I just try to keep the CSS as simple as possible.
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