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style: Serialize background-size: auto auto as "auto".

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With this change, all of Chrome, Edge, Firefox, and Safari serialize
background-size by omitting the second "auto" if the value is "auto
auto".  Other keywords are still repeated.

Differential Revision: https://phabricator.services.mozilla.com/D10446
This commit is contained in:
Cameron McCormack 2018-11-05 02:21:41 +00:00 • committed by Emilio Cobos Álvarez
parent 68f4ad9557
commit 56fd3b786f
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GPG key ID: 056B727BB9C1027C
4 changed files with 53 additions and 3 deletions
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9
components/style/values/specified/length.rs
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@ -20,7 +20,7 @@ use values::computed::{self, CSSPixelLength, Context, ExtremumLength};
use values::generics::length::{MaxLength as GenericMaxLength, MozLength as GenericMozLength};
use values::generics::NonNegative;
use values::specified::calc::CalcNode;
use values::{Auto, CSSFloat, Either, Normal};
use values::{Auto, CSSFloat, Either, Normal, IsAuto};
pub use super::image::{ColorStop, EndingShape as GradientEndingShape, Gradient};
pub use super::image::{GradientKind, Image};
@ -980,6 +980,13 @@ impl Parse for LengthOrPercentageOrAuto {
/// A wrapper of LengthOrPercentageOrAuto, whose value must be >= 0.
pub type NonNegativeLengthOrPercentageOrAuto = NonNegative<LengthOrPercentageOrAuto>;
impl IsAuto for NonNegativeLengthOrPercentageOrAuto {
#[inline]
fn is_auto(&self) -> bool {
*self == Self::auto()
}
}
impl NonNegativeLengthOrPercentageOrAuto {
/// 0
#[inline]