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style: Cascade pres hints after normal user rules.

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Per https://drafts.csswg.org/css-cascade/#preshint and
https://html.spec.whatwg.org/multipage/#presentational-hints.

This was causing failures in the link color reftests with the preferences sheet
as a User sheet.

Bug: 1436782
Reviewed-by: bholley
MozReview-Commit-ID: 9iwEqPBw4CF
This commit is contained in:
Emilio Cobos Álvarez 2018-02-09 20:18:23 +01:00
parent 1d8e78720b
commit 69c018c70d
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GPG key ID: 056B727BB9C1027C
2 changed files with 49 additions and 39 deletions
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12
components/style/rule_tree/mod.rs
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@ -472,22 +472,28 @@ impl RuleTree {
/// where it likely did not result from a rigorous performance analysis.)
const RULE_TREE_GC_INTERVAL: usize = 300;
/// The cascade level these rules are relevant at, as per[1].
/// The cascade level these rules are relevant at, as per[1][2][3].
///
/// Presentational hints for SVG and HTML are in the "author-level
/// zero-specificity" level, that is, right after user rules, and before author
/// rules.
///
/// The order of variants declared here is significant, and must be in
/// _ascending_ order of precedence.
///
/// [1]: https://drafts.csswg.org/css-cascade/#cascade-origin
/// [2]: https://drafts.csswg.org/css-cascade/#preshint
/// [3]: https://html.spec.whatwg.org/multipage/#presentational-hints
#[repr(u8)]
#[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd)]
#[cfg_attr(feature = "servo", derive(MallocSizeOf))]
pub enum CascadeLevel {
/// Normal User-Agent rules.
UANormal = 0,
/// Presentational hints.
PresHints,
/// User normal rules.
UserNormal,
/// Presentational hints.
PresHints,
/// Author normal rules.
AuthorNormal,
/// Style attribute normal rules.