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diff --git a/testing/web-platform/tests/interfaces/webxr-hand-input.idl b/testing/web-platform/tests/interfaces/webxr-hand-input.idl
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+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Hand Input Module - Level 1 (https://immersive-web.github.io/webxr-hand-input/)
+
+partial interface XRInputSource {
+   [SameObject] readonly attribute XRHand? hand;
+};
+
+enum XRHandJoint {
+  "wrist",
+
+  "thumb-metacarpal",
+  "thumb-phalanx-proximal",
+  "thumb-phalanx-distal",
+  "thumb-tip",
+
+  "index-finger-metacarpal",
+  "index-finger-phalanx-proximal",
+  "index-finger-phalanx-intermediate",
+  "index-finger-phalanx-distal",
+  "index-finger-tip",
+
+  "middle-finger-metacarpal",
+  "middle-finger-phalanx-proximal",
+  "middle-finger-phalanx-intermediate",
+  "middle-finger-phalanx-distal",
+  "middle-finger-tip",
+
+  "ring-finger-metacarpal",
+  "ring-finger-phalanx-proximal",
+  "ring-finger-phalanx-intermediate",
+  "ring-finger-phalanx-distal",
+  "ring-finger-tip",
+
+  "pinky-finger-metacarpal",
+  "pinky-finger-phalanx-proximal",
+  "pinky-finger-phalanx-intermediate",
+  "pinky-finger-phalanx-distal",
+  "pinky-finger-tip"
+};
+
+[Exposed=Window]
+interface XRHand {
+    iterable<XRHandJoint, XRJointSpace>;
+
+    readonly attribute unsigned long size;
+    XRJointSpace get(XRHandJoint key);
+};
+
+[Exposed=Window]
+interface XRJointSpace: XRSpace {
+  readonly attribute XRHandJoint jointName;
+};
+
+partial interface XRFrame {
+    XRJointPose? getJointPose(XRJointSpace joint, XRSpace baseSpace);
+    boolean fillJointRadii(sequence<XRJointSpace> jointSpaces, Float32Array radii);
+
+    boolean fillPoses(sequence<XRSpace> spaces, XRSpace baseSpace, Float32Array transforms);
+};
+
+[Exposed=Window]
+interface XRJointPose: XRPose {
+    readonly attribute float radius;
+};