This article on their CSS engine was a great read. It's done by Lin Clark as a series of graphics, making it easy to follow. https://hacks.mozilla.org/2017/08/

This article on their CSS engine was a great read. It's done by Lin Clark as a series of graphics, making it easy to follow. https://hacks.mozilla.org/2017/08/inside-a-super-fast-css-engine-quantum-css-aka-stylo/ https://hacks.mozilla.org/2017/08/inside-a-super-fast-css-en...