added firefox release note for field-sizing

[dletorey]

Description

• Added experimental feature for field-sizing property
• Added field-sizing property to Firefox 151 release note experimental section

Motivation

• Working on MDN issue #43869

Related issues and pull requests

• Content PR
• BCD PR

[github-actions]

Preview URLs (2 pages)

• /en-US/docs/Mozilla/Firefox/Experimental_features
• /en-US/docs/Mozilla/Firefox/Releases/151

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/151
Title: Firefox 151 release notes for developers (Beta)
Flaw count: 1

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

External URLs (2)

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

• https://bugzil.la/1977176 (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Mozilla/Firefox/Releases/151
Title: Firefox 151 release notes for developers (Beta)

• https://bugzil.la/1977176 (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2026-05-15 09:11:28)

[dipikabh]

Thanks, Dave. I've added a rephrasing suggestion.