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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
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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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17
components/style/values/specified/text.rs
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@ -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,
}