[JSWolf]

Originally Posted by pazos

Yeah, and the plan was merged

So Coolreader now has all improvements poire-z made all these years (except RTL support, IIRC, and maybe other fancy stuff. I dunno)

https://github.com/buggins/coolreader/pull/125
https://github.com/buggins/coolreader/pull/142
https://github.com/buggins/coolreader/pull/156
https://github.com/buggins/coolreader/pull/174
https://github.com/buggins/coolreader/pull/186
https://github.com/buggins/coolreader/pull/203

Keep in mind that CSS is a buzzword in these forums. If you see a difference on behaviour between KOReader and Coolreader, where the former does something "better" than the later, please do check against a 3rd party program, like Sigil, and report upstream: https://github.com/buggins/coolreader/issues

It could be just that you're using a different set of rules on each program.

CSS is not a buzzword. It's the set of instructions that says how to format th eBook. If the program doesn't respect the CSS, then you don't get the formatting you should and that's a bug that should be reported so it can be fixed.