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style: Partially back out bug 1105364

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Apparently using transparent borders and outlines is a common
accessibility technique to make those visible in HCM.

Bug 1740924 comment 9 seemed to indicate we were the only browser
rendering those browsers, but I just confirmed that Edge at least does
show them.

Keep respecting system colors as that's per spec.

Differential Revision: https://phabricator.services.mozilla.com/D131412
This commit is contained in:
Emilio Cobos Álvarez 2023-06-02 01:45:30 +02:00 • committed by Oriol Brufau
parent 7797a19c70
commit 71ec52f140
1 changed files with 12 additions and 9 deletions
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21
components/style/properties/cascade.rs
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@ -465,17 +465,20 @@ fn tweak_when_ignoring_colors(
} }
}, },
_ => { _ => {
// We honor transparent and system colors more generally for all // We honor system colors more generally for all colors.
// colors.
// //
// NOTE(emilio): This doesn't handle caret-color and // We used to honor transparent but that causes accessibility
// accent-color because those use a slightly different syntax // regressions like bug 1740924.
// (<color> | auto for example). That's probably fine though, as //
// using a system color for caret-color doesn't make sense (using // NOTE(emilio): This doesn't handle caret-color and accent-color
// currentColor is fine), and we ignore accent-color in // because those use a slightly different syntax (<color> | auto for
// high-contrast-mode anyways. // example).
//
// That's probably fine though, as using a system color for
// caret-color doesn't make sense (using currentColor is fine), and
// we ignore accent-color in high-contrast-mode anyways.
if let Some(color) = declaration.color_value() { if let Some(color) = declaration.color_value() {
if color.is_system() || alpha_channel(color, context) == 0 { if color.is_system() {
return; return;
} }
} }