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style: Implement the math-style property.

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This patch renames the internal -moz-math-display to math-style and
exposes it under the layout.css.math-style.enabled preference. The
initial value becomes "normal" but that does not affect the default
MathML behavior since the UA style sheet sets the math-style property
explicitly on <math> tags. WPT tests are updated to use the syntax
approved by the CSSWG.

Intent to prototype: https://groups.google.com/forum/#!msg/mozilla.dev.platform/1hQQ7ISudGo/_yLEckEeBQAJ

Differential Revision: https://phabricator.services.mozilla.com/D90731
This commit is contained in:
Frederic Wang 2020-09-23 13:04:48 +00:00 • committed by Emilio Cobos Álvarez
parent 74a46d96eb
commit ca03f4df6d
2 changed files with 9 additions and 9 deletions
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12
components/style/properties/longhands/font.mako.rs
View file

@ -239,14 +239,14 @@ ${helpers.predefined_type(
)}
${helpers.single_keyword(
"-moz-math-display",
"inline block",
"math-style",
"normal compact",
engines="gecko",
gecko_constant_prefix="NS_MATHML_DISPLAYSTYLE",
gecko_ffi_name="mMathDisplay",
enabled_in="ua",
spec="Internal (not web-exposed)",
gecko_pref="layout.css.math-style.enabled",
spec="https://mathml-refresh.github.io/mathml-core/#the-math-style-property",
has_effect_on_gecko_scrollbars=False,
animation_value_type="none",
enabled_in="ua",
)}
${helpers.single_keyword(

6
components/style/values/computed/font.rs
View file

@ -819,14 +819,14 @@ impl ToComputedValue for specified::MozScriptLevel {
type ComputedValue = MozScriptLevel;
fn to_computed_value(&self, cx: &Context) -> i8 {
use crate::properties::longhands::_moz_math_display::SpecifiedValue as DisplayValue;
use crate::properties::longhands::math_style::SpecifiedValue as MathStyleValue;
use std::{cmp, i8};
let int = match *self {
specified::MozScriptLevel::Auto => {
let parent = cx.builder.get_parent_font().clone__moz_script_level() as i32;
let display = cx.builder.get_parent_font().clone__moz_math_display();
if display == DisplayValue::Inline {
let style = cx.builder.get_parent_font().clone_math_style();
if style == MathStyleValue::Compact {
parent + 1
} else {
parent