I'm writing a book on web browser internals with Chris Harrelson, who heads the Chrome rendering team: https://browser.engineering/ https://browser.engineering

I'm writing a book on web browser internals with Chris Harrelson, who heads the Chrome rendering team: https://browser.engineering/ https://browser.engineering/ It's in progress but we cover the core architecture of a modern browser in some depth. It's funny you mention CSS recomputation... I have a student working on CSS and layout recomputations (with the Google Chrome team, who are fantastic) right now. It's a challenging and exciting area.