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This continues #43045 Changelog: - Upstream:74ddab4091...6de1071549- Servo fixups:9f2f4f3f1b...6cfce6f329Stylo tracking issue: https://github.com/servo/stylo/issues/347 Summary of improvements: - Adding support for the CSS-wide `revert-rule` keyword - `::details-content` becomes element-backed, thus accepting nested pseudo-elements like `::details-content::before`. - Custom properties can now be registered using dashed idents in their syntax - Various `attr()` improvements Testing: Various WPT improvements --------- Signed-off-by: Oriol Brufau <obrufau@igalia.com>