This continues #220 Changelog: - Upstream: https://github.com/servo/stylo/compare/ec21cec41ca58bd8c994a18d53d88bab78229b0c...fd700321ccc0434b09bc641099e8761d67733913 - Servo fixups: https://github.com/servo/stylo/compare/30f8960428ee7bfc4d1443e136f77f79371ee500...64d8521f1b8509a0160a89e24d0ace2883fa3269 Servo PR: https://github.com/servo/servo/pull/39150
