(for more context, Facebook has a very small style recalc time, so we're bottlenecked right now on the time it takes for us to parse CSS, and build the data str

(for more context, Facebook has a very small style recalc time, so we're bottlenecked right now on the time it takes for us to parse CSS, and build the data structures for selector-matching and invalidation, and the patches on the queue are https://github.com/servo/servo/pull/18191 https://github.com/servo/servo/pull/18191)