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Firefox Nightly adds @container style() behind pref#29279

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caugner merged 6 commits intomdn:mainfrom
dletorey:43206-style-queries
Mar 20, 2026
Merged

Firefox Nightly adds @container style() behind pref#29279
caugner merged 6 commits intomdn:mainfrom
dletorey:43206-style-queries

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@dletorey
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@dletorey dletorey commented Mar 17, 2026

Summary

  • added firefox support for @container style() queries

Test results and supporting details

  • Tested with @container style() test in:
    • Firefox nightly 150.0a1 (2026-03-16) (no flag)
    • Firefox Developer Edition 149.0b6 (with layout.css.style-queries.enabled)
      • Firefox Beta 149.0b6 (with layout.css.style-queries.enabled)

Related issues

@github-actions github-actions bot added the data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS label Mar 17, 2026
@github-actions github-actions bot added the size:s [PR only] 7-24 LoC changed label Mar 17, 2026
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github-actions bot commented Mar 17, 2026

Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

@caugner caugner changed the title updated ff support for @container style() Firefox Nightly adds @container style() behind pref Mar 20, 2026
@caugner caugner merged commit 086d0cc into mdn:main Mar 20, 2026
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data:css Compat data for CSS features. https://developer.mozilla.org/docs/Web/CSS size:s [PR only] 7-24 LoC changed

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