Interesting.
I know I tested using body {background-color: ...} in a lot of different readers several years ago and they must have mostly worked, otherwise I wouldn't have included that as the way to change background in FFF.
Trying it now a few places, I see that color works in Calibre Edit book preview and Calibre's "Set the cover for the book from the selected format" (AKA from calibre.ebooks.metadata.meta.get_metadata()), plus partially in Apple iPad's Books app, but not any other apps or readers that I tried.
Which I guess is a good thing to know. I'll have to take that make note of that in the default FFF CSS.
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