Thanks to you both.
I have checked the Amazon Kindle Publishing Guidelines and I'm pretty sure the relevant HTML/CSS is supported (still working my way through the document as a whole, but there doesn't seem to be any unsupported image-related code).
It's not for my own viewing and it's not for sale on Amazon, but I do need to make sure that people who read e-books on a Kindle can read it easily without going to any extra effort. Since you can't edit a .mobi file directly in Calibre, I've been working on the .azw3 file, which was converted from an .epub. If there's a better way to do it, I'm open! (Apparently my Mac cannot open Kindlegen.)
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