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style: Prototype :focus-visible behind a flag.

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The heuristic is that we show focus outlines for unknown or key focus, and not
for mouse / touch.

This is probably not the final heuristic we take, but this allows people to play
with it and file bugs.

Once this is mature enough we should remove :-moz-focusring in favor of
:focus-visible.

Differential Revision: https://phabricator.services.mozilla.com/D63861
This commit is contained in:
Emilio Cobos Álvarez 2020-02-26 14:16:20 +00:00
parent 7af9a087aa
commit d8cb4c4647
4 changed files with 9 additions and 0 deletions
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3
components/style/gecko/selector_parser.rs
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@ -172,6 +172,9 @@ impl NonTSPseudoClass {
/// Returns whether the pseudo-class is enabled in content sheets.
#[inline]
fn is_enabled_in_content(&self) -> bool {
if matches!(*self, NonTSPseudoClass::FocusVisible) {
return static_prefs::pref!("layout.css.focus-visible.enabled")
}
!self.has_any_flag(NonTSPseudoClassFlag::PSEUDO_CLASS_ENABLED_IN_UA_SHEETS_AND_CHROME)
}