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diff --git a/testing/web-platform/tests/interfaces/css-animation-worklet.idl b/testing/web-platform/tests/interfaces/css-animation-worklet.idl
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+++ b/testing/web-platform/tests/interfaces/css-animation-worklet.idl
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+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Animation Worklet API (https://drafts.css-houdini.org/css-animationworklet-1/)
+
+[Exposed=Window]
+partial namespace CSS {
+    [SameObject] readonly attribute Worklet animationWorklet;
+};
+
+[ Global=(Worklet,AnimationWorklet), Exposed=AnimationWorklet ]
+interface AnimationWorkletGlobalScope : WorkletGlobalScope {
+    undefined registerAnimator(DOMString name, AnimatorInstanceConstructor animatorCtor);
+};
+
+callback AnimatorInstanceConstructor = any (any options, optional any state);
+
+[ Exposed=AnimationWorklet ]
+interface WorkletAnimationEffect {
+    EffectTiming         getTiming();
+    ComputedEffectTiming getComputedTiming();
+    attribute double? localTime;
+};
+
+[Exposed=Window]
+interface WorkletAnimation : Animation {
+        constructor(DOMString animatorName,
+              optional (AnimationEffect or sequence<AnimationEffect>)? effects = null,
+              optional AnimationTimeline? timeline,
+              optional any options);
+        readonly attribute DOMString animatorName;
+};
+
+[Exposed=AnimationWorklet]
+interface WorkletGroupEffect {
+  sequence<WorkletAnimationEffect> getChildren();
+};