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script: Remove `reflect_dom_object_with_proto_and_cx` (#47092)
script: Remove note about resolved web-animations issue (#46831)
script: Implement `AnimationTimeline` and `DocumentTimeline` from Web Animations (#43711)
script: Mechanically migrate to `reflect_dom_object_with_proto` (#46529)
script: Implement `Animation.effect`, `AnimationEffect.getTiming()`, `AnimationEffect.getComputedTiming()` and `AnimationEffect.updateTiming()` (#46677)
script: Stub out core interfaces of the Web Animation API (#45522)