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Comment by topspin

4 days ago

That came to my mind as well. CSS was one of the earliest major applications of Rust in FireFox. I believe that work was when the "Fearless Concurrency" slogan was popularized.

Yup. To this day, Firefox remains the only browser with a *parallel* CSS engine. Chromium and WebKit teams have considered this and decided not to pursue since it's really easy to get concurrency wrong.

If I recall correctly, the CSS engine was originally developed for Servo and later embedded into Firefox.