This continues #236 Changelog: - Upstream: https://github.com/servo/stylo/compare/fd700321ccc0434b09bc641099e8761d67733913...b98470a5cbd3792db79366ec1559d72231ef2c1f - Servo fixups: https://github.com/servo/stylo/compare/1040a20611a125ef120082158340bbafa2e2ff66...4ba7bdb4040a909bf3d6e326b229602c93014618 Servo PR: https://github.com/servo/servo/pull/39612
