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style: Migrate <th> text-align behaviour from presentation hint to UA CSS

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Differential Revision: https://phabricator.services.mozilla.com/D142494
This commit is contained in:
David Shin 2023-06-18 14:06:52 +02:00 • committed by Martin Robinson
parent 0cf72d5e70
commit 739d6d14ab
2 changed files with 14 additions and 21 deletions
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18
components/style/gecko/wrapper.rs
View file

@ -1588,23 +1588,9 @@ impl<'le> TElement for GeckoElement<'le> {
use crate::properties::longhands::_x_lang::SpecifiedValue as SpecifiedLang;
use crate::properties::longhands::_x_text_zoom::SpecifiedValue as SpecifiedZoom;
use crate::properties::longhands::color::SpecifiedValue as SpecifiedColor;
use crate::properties::longhands::text_align::SpecifiedValue as SpecifiedTextAlign;
use crate::stylesheets::layer_rule::LayerOrder;
use crate::values::specified::color::Color;
lazy_static! {
static ref TH_RULE: ApplicableDeclarationBlock = {
let global_style_data = &*GLOBAL_STYLE_DATA;
let pdb = PropertyDeclarationBlock::with_one(
PropertyDeclaration::TextAlign(SpecifiedTextAlign::MozCenterOrInherit),
Importance::Normal,
);
let arc = Arc::new_leaked(global_style_data.shared_lock.wrap(pdb));
ApplicableDeclarationBlock::from_declarations(
arc,
ServoCascadeLevel::PresHints,
LayerOrder::root(),
)
};
static ref TABLE_COLOR_RULE: ApplicableDeclarationBlock = {
let global_style_data = &*GLOBAL_STYLE_DATA;
let pdb = PropertyDeclarationBlock::with_one(
@ -1649,9 +1635,7 @@ impl<'le> TElement for GeckoElement<'le> {
let ns = self.namespace_id();
// <th> elements get a default MozCenterOrInherit which may get overridden
if ns == structs::kNameSpaceID_XHTML as i32 {
if self.local_name().as_ptr() == atom!("th").as_ptr() {
hints.push(TH_RULE.clone());
} else if self.local_name().as_ptr() == atom!("table").as_ptr() &&
if self.local_name().as_ptr() == atom!("table").as_ptr() &&
self.as_node().owner_doc().quirks_mode() == QuirksMode::Quirks
{
hints.push(TABLE_COLOR_RULE.clone());

17
components/style/values/specified/text.rs
View file

@ -528,11 +528,20 @@ pub enum TextAlign {
/// unlike other keywords.
#[cfg(feature = "gecko")]
MatchParent,
/// `MozCenterOrInherit` value of text-align property. It cannot be parsed,
/// only set directly on the elements and it has a different handling
/// unlike other values.
/// This is how we implement the following HTML behavior from
/// https://html.spec.whatwg.org/#tables-2:
///
/// User agents are expected to have a rule in their user agent style sheet
/// that matches th elements that have a parent node whose computed value
/// for the 'text-align' property is its initial value, whose declaration
/// block consists of just a single declaration that sets the 'text-align'
/// property to the value 'center'.
///
/// Since selectors can't depend on the ancestor styles, we implement it with a
/// magic value that computes to the right thing. Since this is an
/// implementation detail, it shouldn't be exposed to web content.
#[cfg(feature = "gecko")]
#[css(skip)]
#[parse(condition = "ParserContext::in_ua_or_chrome_sheet")]
MozCenterOrInherit,
}