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Add Firefox experimental features entry for @supports at-rule() function - #45555

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Add Firefox experimental features entry for @supports at-rule() function#45555
chrisdavidmills wants to merge 1 commit into
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chrisdavidmills:fx-preview-supports-at-rule

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Description

Firefox 155 adds support for the @supports at-rule() function, currently only enabled by default in Nightly. In other versions, it is behind the layout.css.supports.at-rule.enabled pref. See https://bugzilla.mozilla.org/show_bug.cgi?id=2060754.

This PR adds an Experimental features entry for at-rule(). It already has an entry in the Firefox 155 rel notes, and the feature is already documented sufficiently.

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@chrisdavidmills
chrisdavidmills requested a review from a team as a code owner September 7, 2026 17:58
@chrisdavidmills
chrisdavidmills requested review from dipikabh and removed request for a team September 7, 2026 17:58
@github-actions github-actions Bot added Content:Firefox Content in the Mozilla/Firefox subtree size/s [PR only] 6-50 LoC changed labels Sep 7, 2026
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github-actions Bot commented Sep 7, 2026

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External URLs (1)

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

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