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diff --git a/servo/components/style/values/generics/effects.rs b/servo/components/style/values/generics/effects.rs
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+++ b/servo/components/style/values/generics/effects.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 values related to effects.
+
+/// A generic value for a single `box-shadow`.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToAnimatedValue,
+    ToAnimatedZero,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C)]
+pub struct GenericBoxShadow<Color, SizeLength, BlurShapeLength, ShapeLength> {
+    /// The base shadow.
+    pub base: GenericSimpleShadow<Color, SizeLength, BlurShapeLength>,
+    /// The spread radius.
+    pub spread: ShapeLength,
+    /// Whether this is an inset box shadow.
+    #[animation(constant)]
+    #[css(represents_keyword)]
+    pub inset: bool,
+}
+
+pub use self::GenericBoxShadow as BoxShadow;
+
+/// A generic value for a single `filter`.
+#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
+#[derive(
+    Clone,
+    ComputeSquaredDistance,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToAnimatedValue,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[animation(no_bound(U))]
+#[repr(C, u8)]
+pub enum GenericFilter<Angle, NonNegativeFactor, ZeroToOneFactor, Length, Shadow, U> {
+    /// `blur(<length>)`
+    #[css(function)]
+    Blur(Length),
+    /// `brightness(<factor>)`
+    #[css(function)]
+    Brightness(NonNegativeFactor),
+    /// `contrast(<factor>)`
+    #[css(function)]
+    Contrast(NonNegativeFactor),
+    /// `grayscale(<factor>)`
+    #[css(function)]
+    Grayscale(ZeroToOneFactor),
+    /// `hue-rotate(<angle>)`
+    #[css(function)]
+    HueRotate(Angle),
+    /// `invert(<factor>)`
+    #[css(function)]
+    Invert(ZeroToOneFactor),
+    /// `opacity(<factor>)`
+    #[css(function)]
+    Opacity(ZeroToOneFactor),
+    /// `saturate(<factor>)`
+    #[css(function)]
+    Saturate(NonNegativeFactor),
+    /// `sepia(<factor>)`
+    #[css(function)]
+    Sepia(ZeroToOneFactor),
+    /// `drop-shadow(...)`
+    #[css(function)]
+    DropShadow(Shadow),
+    /// `<url>`
+    #[animation(error)]
+    Url(U),
+}
+
+pub use self::GenericFilter as Filter;
+
+/// A generic value for the `drop-shadow()` filter and the `text-shadow` property.
+///
+/// Contrary to the canonical order from the spec, the color is serialised
+/// first, like in Gecko and Webkit.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToAnimatedValue,
+    ToAnimatedZero,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C)]
+pub struct GenericSimpleShadow<Color, SizeLength, ShapeLength> {
+    /// Color.
+    pub color: Color,
+    /// Horizontal radius.
+    pub horizontal: SizeLength,
+    /// Vertical radius.
+    pub vertical: SizeLength,
+    /// Blur radius.
+    pub blur: ShapeLength,
+}
+
+pub use self::GenericSimpleShadow as SimpleShadow;