But your suggestion still won't guarantee the inverted colors will be visible. That's what I keep trying to say. You're focused on dark = black. And that's just because you're using the dark mode that ships with Sigil that uses black. Not everyone (and frankly not that many at all) does on Linux. They use a system supplied Qt theme for Sigil. And the background of another dark theme on linux could just as well be maroon, or dark gray.
There will never be a good (let alone failsafe) way to override an ebook's css colors. For darkmode or any other other reason. And much work to attempt to do so (for an editor no less--not even a reader) doesn't make a lot of sense to me.
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