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diff --git a/servo/components/style/values/generics/box.rs b/servo/components/style/values/generics/box.rs
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+++ b/servo/components/style/values/generics/box.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 box properties.
+
+use crate::values::animated::ToAnimatedZero;
+use std::fmt::{self, Write};
+use style_traits::{CssWriter, ToCss};
+
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    FromPrimitive,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(u8)]
+#[allow(missing_docs)]
+pub enum VerticalAlignKeyword {
+    Baseline,
+    Sub,
+    Super,
+    Top,
+    TextTop,
+    Middle,
+    Bottom,
+    TextBottom,
+    #[cfg(feature = "gecko")]
+    MozMiddleWithBaseline,
+}
+
+/// A generic value for the `vertical-align` property.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C, u8)]
+pub enum GenericVerticalAlign<LengthPercentage> {
+    /// One of the vertical-align keywords.
+    Keyword(VerticalAlignKeyword),
+    /// `<length-percentage>`
+    Length(LengthPercentage),
+}
+
+pub use self::GenericVerticalAlign as VerticalAlign;
+
+impl<L> VerticalAlign<L> {
+    /// Returns `baseline`.
+    #[inline]
+    pub fn baseline() -> Self {
+        VerticalAlign::Keyword(VerticalAlignKeyword::Baseline)
+    }
+}
+
+impl<L> ToAnimatedZero for VerticalAlign<L> {
+    fn to_animated_zero(&self) -> Result<Self, ()> {
+        Err(())
+    }
+}
+
+/// https://drafts.csswg.org/css-sizing-4/#intrinsic-size-override
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToAnimatedValue,
+    ToAnimatedZero,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[value_info(other_values = "auto")]
+#[repr(C, u8)]
+pub enum GenericContainIntrinsicSize<L> {
+    /// The keyword `none`.
+    None,
+    /// A non-negative length.
+    Length(L),
+    /// "auto <Length>"
+    AutoLength(L),
+}
+
+pub use self::GenericContainIntrinsicSize as ContainIntrinsicSize;
+
+impl<L: ToCss> ToCss for ContainIntrinsicSize<L> {
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        match *self {
+            Self::None => dest.write_str("none"),
+            Self::Length(ref l) => l.to_css(dest),
+            Self::AutoLength(ref l) => {
+                dest.write_str("auto ")?;
+                l.to_css(dest)
+            },
+        }
+    }
+}
+
+/// Note that we only implement -webkit-line-clamp as a single, longhand
+/// property for now, but the spec defines line-clamp as a shorthand for
+/// separate max-lines, block-ellipsis, and continue properties.
+///
+/// https://drafts.csswg.org/css-overflow-3/#line-clamp
+#[derive(
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToAnimatedValue,
+    ToAnimatedZero,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(transparent)]
+#[value_info(other_values = "none")]
+pub struct GenericLineClamp<I>(pub I);
+
+pub use self::GenericLineClamp as LineClamp;
+
+impl<I: crate::Zero> LineClamp<I> {
+    /// Returns the `none` value.
+    pub fn none() -> Self {
+        Self(crate::Zero::zero())
+    }
+
+    /// Returns whether we're the `none` value.
+    pub fn is_none(&self) -> bool {
+        self.0.is_zero()
+    }
+}
+
+impl<I: crate::Zero + ToCss> ToCss for LineClamp<I> {
+    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+    where
+        W: Write,
+    {
+        if self.is_none() {
+            return dest.write_str("none");
+        }
+        self.0.to_css(dest)
+    }
+}
+
+/// https://drafts.csswg.org/css-animations/#animation-iteration-count
+#[derive(
+    Clone,
+    Debug,
+    MallocSizeOf,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+pub enum GenericAnimationIterationCount<Number> {
+    /// A `<number>` value.
+    Number(Number),
+    /// The `infinite` keyword.
+    Infinite,
+}
+
+pub use self::GenericAnimationIterationCount as AnimationIterationCount;
+
+/// A generic value for the `perspective` property.
+#[derive(
+    Animate,
+    Clone,
+    ComputeSquaredDistance,
+    Copy,
+    Debug,
+    MallocSizeOf,
+    Parse,
+    PartialEq,
+    SpecifiedValueInfo,
+    ToAnimatedValue,
+    ToAnimatedZero,
+    ToComputedValue,
+    ToCss,
+    ToResolvedValue,
+    ToShmem,
+)]
+#[repr(C, u8)]
+pub enum GenericPerspective<NonNegativeLength> {
+    /// A non-negative length.
+    Length(NonNegativeLength),
+    /// The keyword `none`.
+    None,
+}
+
+pub use self::GenericPerspective as Perspective;
+
+impl<L> Perspective<L> {
+    /// Returns `none`.
+    #[inline]
+    pub fn none() -> Self {
+        Perspective::None
+    }
+}