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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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14
components/style/properties/computed_value_flags.rs
View file

@ -12,7 +12,7 @@ bitflags! {
/// If we ever want to add some flags that shouldn't inherit for them,
/// we might want to add a function to handle this.
#[repr(C)]
pub struct ComputedValueFlags: u16 {
pub struct ComputedValueFlags: u32 {
/// Whether the style or any of the ancestors has a text-decoration-line
/// property that should get propagated to descendants.
///
@ -89,6 +89,18 @@ bitflags! {
/// FIXME(emilio): Try to merge this with BORDER_BACKGROUND, see
/// https://github.com/w3c/csswg-drafts/issues/4777
const HAS_AUTHOR_SPECIFIED_PADDING = 1 << 15;
/// Whether there are author-specified rules for `font-family`.
const HAS_AUTHOR_SPECIFIED_FONT_FAMILY = 1 << 16;
/// Whether there are author-specified rules for `font-synthesis`.
const HAS_AUTHOR_SPECIFIED_FONT_SYNTHESIS = 1 << 17;
/// Whether there are author-specified rules for `letter-spacing`.
const HAS_AUTHOR_SPECIFIED_LETTER_SPACING = 1 << 18;
/// Whether there are author-specified rules for `word-spacing`.
const HAS_AUTHOR_SPECIFIED_WORD_SPACING = 1 << 19;
}
}