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They could use the CPAL and COLR tables to turn each glyph / frame of the game into multiple RGBA layers.

Are CPAL and COLOR supported by chrome?

Chrome definitely supports them on Windows at least, I don't know if it supports them on other operating systems. Here's a test page for the various kinds of color font tables: https://yoksel.github.io/color-fonts-demo/

Sweet! I might make a FontKid Color!

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