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diff --git a/servo/components/style/values/generics/motion.rs b/servo/components/style/values/generics/motion.rs
new file mode 100644
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+++ b/servo/components/style/values/generics/motion.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! Generic types for CSS Motion Path.
+
+use crate::values::specified::SVGPathData;
+
+/// The <size> in ray() function.
+///
+/// https://drafts.fxtf.org/motion-1/#valdef-offsetpath-size
+#[allow(missing_docs)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    Deserialize,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    Serialize,
+    SpecifiedValueInfo,
+    ToAnimatedZero,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(u8)]
+pub enum RaySize {
+    ClosestSide,
+    ClosestCorner,
+    FarthestSide,
+    FarthestCorner,
+    Sides,
+}
+
+/// The `ray()` function, `ray( [ <angle> && <size> && contain? ] )`
+///
+/// https://drafts.fxtf.org/motion-1/#valdef-offsetpath-ray
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Debug,
+    Deserialize,
+    MallocSizeOf,
+    PartialEq,
+    Serialize,
+    SpecifiedValueInfo,
+    ToAnimatedZero,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C)]
+pub struct RayFunction<Angle> {
+    /// The bearing angle with `0deg` pointing up and positive angles
+    /// representing clockwise rotation.
+    pub angle: Angle,
+    /// Decide the path length used when `offset-distance` is expressed
+    /// as a percentage.
+    #[animation(constant)]
+    pub size: RaySize,
+    /// Clamp `offset-distance` so that the box is entirely contained
+    /// within the path.
+    #[animation(constant)]
+    #[css(represents_keyword)]
+    pub contain: bool,
+}
+
+/// The offset-path value.
+///
+/// https://drafts.fxtf.org/motion-1/#offset-path-property
+/// cbindgen:private-default-tagged-enum-constructor=false
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Debug,
+    Deserialize,
+    MallocSizeOf,
+    PartialEq,
+    Serialize,
+    SpecifiedValueInfo,
+    ToAnimatedZero,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C, u8)]
+pub enum GenericOffsetPath<Angle> {
+    // We could merge SVGPathData into ShapeSource, so we could reuse them. However,
+    // we don't want to support other value for offset-path, so use SVGPathData only for now.
+    /// Path value for path(<string>).
+    #[css(function)]
+    Path(SVGPathData),
+    /// ray() function, which defines a path in the polar coordinate system.
+    #[css(function)]
+    Ray(RayFunction<Angle>),
+    /// None value.
+    #[animation(error)]
+    None,
+    // Bug 1186329: Implement <basic-shape>, <geometry-box>, and <url>.
+}
+
+pub use self::GenericOffsetPath as OffsetPath;
+
+impl<Angle> OffsetPath<Angle> {
+    /// Return None.
+    #[inline]
+    pub fn none() -> Self {
+        OffsetPath::None
+    }
+}