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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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7
components/style/values/mod.rs
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@ -243,6 +243,13 @@ impl KeyframesName {
impl Eq for KeyframesName {}
/// A trait that returns whether a given type is the `auto` value or not. So far
/// only needed for background-size serialization, which special-cases `auto`.
pub trait IsAuto {
/// Returns whether the value is the `auto` value.
fn is_auto(&self) -> bool;
}
impl PartialEq for KeyframesName {
fn eq(&self, other: &Self) -> bool {
self.as_atom() == other.as_atom()