SOLVED!
In my first post, I wrote:
Quote:
Originally Posted by st_albert
I don't think this is a bug, but more likely ignorance on my part.
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After absorbing all the advice presented above, especially Kevin's pointing me to font issues, it turns out my suspicion was correct. It was a PEBKAC problem.
After closely examining the inspector's "computed styles" column, I noticed that the rendered font was "aakar," which I think was a leftover from an over-zealous installation of foreign-language fonts by LibreOffice.
In contrast, on the machine that WAS displaying correctly, the rendered font was Times New Roman.
So on the problem machine, I deleted the "aakar" font. Now the rendered font became "Noto Serif" which behaves as expected with no modifications to the epub's CSS (e.g. changing font-weight: to 900 instead of "bold")
Many thanks to all the commentators for giving me the clues I needed!
Albert