As of Firefox 151, I intend to turn CSS Container Style Queries on by default for all platforms.

It has been developed behind the layout.css.style-queries.enabled preference.

Status in other browsers is as shown below.

*Bug to turn on by default*:
https://bugzilla.mozilla.org/show_bug.cgi?id=2030645

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*

*Summary*:
Style queries (a part of CSS Container Queries) provide a way for stylesheets to query the current styling of a container element, and conditionally apply additional CSS to the contents of that container.

*Bug*:
https://bugzilla.mozilla.org/show_bug.cgi?id=1795622

*Specification*:
https://drafts.csswg.org/css-conditional-5/#container-rule

*Standards Body*:
CSSWG

*Platform Coverage*:
All

*Preference*:
layout.css.style-queries.enabled

*DevTools Bug*:
https://bugzilla.mozilla.org/show_bug.cgi?id=2002239

*Extensions Bug*:
n/a

*Use Counter*:
n/a - included in interop-2026 suite so will be widely exposed

*Standards-Positions Discussion*:
https://github.com/mozilla/standards-positions/issues/686 [positive]

*Other Browsers*:
- Blink: shipped since Chrome 111
- WebKit: shipped since Safari 18.0

*web-platform-tests*:
https://wpt.fyi/results/css/css-conditional/container-queries?label=master&label=experimental&aligned&q=style

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