Thanks for implementing this, it's awesome I found a couple issues for DevTools: - Bug 2047874 - Wrong color displayed in color swatch for relative color using sibling-index() <https://bugzilla.mozilla.org/show_bug.cgi?id=2047874> - Bug 2047871 - Unable to calculate contrast information for relative color with sibling-index() computation <https://bugzilla.mozilla.org/show_bug.cgi?id=2047871>
On Thursday, June 11, 2026 at 1:48:28 AM UTC+2 [email protected] wrote: > *Summary*: > The sibling-index() > <https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/sibling-index> > > and sibling-count() > <https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/sibling-count> > > CSS functions allow an element to be styled using its index among its > siblings and its total count of siblings (including itself), respectively. > These functions produce integers and can be used with elements anywhere > that an integer is allowed, including in calculations. > > We intend to enable these functions in *Firefox Nightly* builds behind > the *layout.css.tree-counting-functions.enabled* pref. > > *Bug*: > Bug 1953973 - [css-values] Add sibling-count() and sibling-index() > <https://bugzilla.mozilla.org/show_bug.cgi?id=1953973> > > *Specification*: > https://drafts.csswg.org/css-values-5/#tree-counting > > *Standards Body*: > CSSWG / W3C > > *Platform Coverage*: > All > > *Preference*: > *layout.css.tree-counting-functions.enabled* — Bug 2045705 > <https://bugzilla.mozilla.org/show_bug.cgi?id=2045705> to enable in > Nightly > > *DevTools Bug*: > N/A > > *Extensions Bug*: > N/A > > *Use Counter*: > N/A > > *Standards-Positions Discussion*: > https://github.com/mozilla/standards-positions/issues/1194 — Positive > > *Other Browsers*: > - Blink: Shipped since Chrome 138 > - WebKit: Shipped since Safari 26.2 > > *web-platform-tests*: > https://wpt.fyi/results/css/css-values/tree-counting > > -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/mozilla.org/d/msgid/dev-platform/1dabe0d5-6fcf-40d4-adae-1a056e823d36n%40mozilla.org.
