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diff --git a/servo/components/style/values/generics/column.rs b/servo/components/style/values/generics/column.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 the column properties.
+
+/// A generic type for `column-count` values.
+#[derive(
+ Animate,
+ Clone,
+ ComputeSquaredDistance,
+ Copy,
+ Debug,
+ MallocSizeOf,
+ Parse,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToAnimatedValue,
+ ToAnimatedZero,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+pub enum ColumnCount<PositiveInteger> {
+ /// A positive integer.
+ Integer(PositiveInteger),
+ /// The keyword `auto`.
+ #[animation(error)]
+ Auto,
+}
+
+impl<I> ColumnCount<I> {
+ /// Returns `auto`.
+ #[inline]
+ pub fn auto() -> Self {
+ ColumnCount::Auto
+ }
+
+ /// Returns whether this value is `auto`.
+ #[inline]
+ pub fn is_auto(self) -> bool {
+ matches!(self, ColumnCount::Auto)
+ }
+}