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Found some discussion about it: https://typo.social/@gdc/112959308500800771 .

And.. Introduction to OpenType Programming https://simoncozens.github.io/fonts-and-layout/features.html - about lookups.

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Fascinating. TIL about `override-colors` in CSS. Now if we can automate the generation of color alternates and run it through a bunch of TextMate grammars to generate a font, this could be even more awesome.

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