Hi everyone. Sorry I've not been contributing, despite being named in the title.
I've been asked about what to do with blockquotes and Kindlegen, as sometimes they don't seem to work.
The answer is that Kindlegen (& Mobipocket Creator) don't handle blockquotes well. They will only apply to the first paragraph immediately following the blockquote open tag. Ughh...
If you're aiming at generating ePub and Kindle/Mobipocket from the same source, I've found it's necessary to limit the formatting choices in the ePub — keeping the CSS very simple. But even then there are lots of pitfalls. See the thread here:
https://www.mobileread.com/forums/showthread.php?t=96061