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style: Add some style quirks for legacy ::markers created from list-style-type/list-style-image

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Specifically:
For "bullets", i.e. 'list-style-type:disc|circle|square|
disclosure-closed|disclosure-open', we use a built-in font
(-moz-bullet-font, which has glyphs for those symbols + space) to
retain mostly backwards compatible rendering for those.  Authors may
override that with an explicit 'font-family' ::marker style though.
We also use this font for 'list-style-image' in case it would
fallback to one of the above when the image fails to load (so that
we get the same width space).

When the -moz-bullet-font is used we also set 'font-synthesis' to
avoid synthesizing italic/bold for this font. Authors may override
this with an explicit ::marker declaration.

We also set 'letter-spacing' and 'word-spacing' to the initial value
for bullets for web-compat reasons.  Again, authors may override
this with an explicit ::marker declaration. (This breaks backwards-
compat slightly but makes us compatible with Chrome.  We used to
ignore these for list-style-type:<string> too.)

Differential Revision: https://phabricator.services.mozilla.com/D111693
This commit is contained in:
Mats Palmgren 2023-05-21 23:39:34 +02:00 • committed by Oriol Brufau
parent d2a7ebf789
commit d7e00ba03d
7 changed files with 128 additions and 1 deletions
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15
components/style/values/generics/mod.rs
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@ -95,6 +95,21 @@ impl CounterStyle {
pub fn decimal() -> Self {
CounterStyle::Name(CustomIdent(atom!("decimal")))
}
/// Is this a bullet? (i.e. `list-style-type: disc|circle|square|disclosure-closed|disclosure-open`)
#[inline]
pub fn is_bullet(&self) -> bool {
match self {
CounterStyle::Name(CustomIdent(ref name)) => {
name == &atom!("disc") ||
name == &atom!("circle") ||
name == &atom!("square") ||
name == &atom!("disclosure-closed") ||
name == &atom!("disclosure-open")
}
_ => false,
}
}
}
impl Parse for CounterStyle {