added release notes for tree counting css functions

[dletorey]

Description

• Added release for CSS tree counting functions, sibling-count() & sibling-index(), to:
  • Experimental features
  • Firefox 153 (experimental section)

Motivation

• Working on MDN issue #44465
• Working on MDN issue #44469

Related pull requests

• BCD PR

[github-actions]

Preview URLs (2 pages)

• /en-US/docs/Mozilla/Firefox/Experimental_features
• /en-US/docs/Mozilla/Firefox/Releases/153

Flaws (1)

Note! 1 document with no flaws that don't need to be listed. 🎉

Found an unexpected or unresolvable flaw? Please report it here.

URL: /en-US/docs/Mozilla/Firefox/Releases/153
Title: Firefox 153 release notes for developers (Beta)
Flaw count: 1

• macros:
  • Macro domxref produces link /en-US/docs/Web/API/RTCDtlsTransport/getRemoteCertificates which doesn't resolve

External URLs (2)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox

• https://bugzil.la/2042063 (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Mozilla/Firefox/Releases/153
Title: Firefox 153 release notes for developers (Beta)

• https://bugzil.la/2042063 (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2026-06-30 16:30:35)