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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 <ratio>.
+//! https://drafts.csswg.org/css-values/#ratios
+
+use std::fmt::{self, Write};
+use style_traits::{CssWriter, ToCss};
+
+/// A generic value for the `<ratio>` value.
+#[derive(
+ Clone,
+ Copy,
+ Debug,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToResolvedValue,
+ ToShmem,
+)]
+#[repr(C)]
+pub struct Ratio<N>(pub N, pub N);
+
+impl<N> ToCss for Ratio<N>
+where
+ N: ToCss,
+{
+ fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+ where
+ W: Write,
+ {
+ self.0.to_css(dest)?;
+ // Even though 1 could be omitted, we don't per
+ // https://drafts.csswg.org/css-values-4/#ratio-value:
+ //
+ // The second <number> is optional, defaulting to 1. However,
+ // <ratio> is always serialized with both components.
+ //
+ // And for compat reasons, see bug 1669742.
+ //
+ // We serialize with spaces for consistency with all other
+ // slash-delimited things, see
+ // https://github.com/w3c/csswg-drafts/issues/4282
+ dest.write_str(" / ")?;
+ self.1.to_css(dest)?;
+ Ok(())
+ }
+}