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style: Always serialize ratio with both components.

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Differential Revision: https://phabricator.services.mozilla.com/D93639
This commit is contained in:
Emilio Cobos Álvarez 2020-10-15 16:12:16 +00:00
parent a1fa0c610f
commit a4f82712ae
1 changed files with 14 additions and 7 deletions
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21
components/style/values/generics/position.rs
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@ -5,7 +5,6 @@
//! Generic types for CSS handling of specified and computed values of
//! [`position`](https://drafts.csswg.org/css-backgrounds-3/#position)
use crate::One;
use std::fmt::{self, Write};
use style_traits::{CssWriter, ToCss};
@ -175,18 +174,26 @@ pub struct Ratio<N>(pub N, pub N);
impl<N> ToCss for Ratio<N>
where
N: ToCss + One + std::cmp::PartialEq,
N: ToCss
{
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
self.0.to_css(dest)?;
// The second defaults to 1. So if it is one, we omit it in serialization.
if !self.1.is_one() {
dest.write_str(" / ")?;
self.1.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(())
}
}