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dletorey merged 8 commits into from
Mar 18, 2026
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added release notes for @container style() queries #43473

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f7020ae
added release notes for @container style() queries
dletorey Mar 17, 2026
ed6eee5
Merge branch 'main' of github.com:dletorey/content
dletorey Mar 17, 2026
91867d9
Merge branch 'main' into 43206-style-queries
dletorey Mar 17, 2026
13a7dab
Merge branch 'main' into 43206-style-queries
dletorey Mar 18, 2026
2f29a7d
Update files/en-us/mozilla/firefox/experimental_features/index.md
dletorey Mar 18, 2026
7b024b4
Update files/en-us/mozilla/firefox/releases/149/index.md
dletorey Mar 18, 2026
d933c65
maded changes to reflect experimental page
dletorey Mar 18, 2026
3927e41
Merge branch 'main' into 43206-style-queries
dletorey Mar 18, 2026
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14 changes: 14 additions & 0 deletions files/en-us/mozilla/firefox/experimental_features/index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -375,6 +375,20 @@ The media-based pseudo-classes {{cssxref(":buffering")}}, {{cssxref(":muted")}},
- `dom.media.pseudo-classes.enabled`
- : Set to `true` to enable.

### `@container style()` queries

The [`@container`](/en-US/docs/Web/CSS/Reference/At-rules/@container) CSS at-rule supports [`style()`](/en-US/docs/Web/CSS/Guides/Containment/Container_size_and_style_queries#container_style_queries) queries. This allows you to check if a container has a valid CSS declaration, a CSS property, or a custom property, and apply styles to its children accordingly. ([Firefox bug 2014404](https://bugzil.la/2014404)).

| Release channel | Version added | Enabled by default? |
| ----------------- | ------------- | ------------------- |
| Nightly | 149 | Yes |
| Developer Edition | 149 | No |
| Beta | 149 | No |
| Release | 149 | No |

- `layout.css.style-queries.enabled`
- : Set to `true` to enable.

## SVG

**No experimental features in this release cycle.**
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4 changes: 4 additions & 0 deletions files/en-us/mozilla/firefox/releases/149/index.md
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Expand Up @@ -143,3 +143,7 @@ You can find more such features on the [Experimental features](/en-US/docs/Mozil
- **`alpha` & `colorspace` attributes in `color` input elements** (Nightly only): `dom.forms.html_color_picker.enabled`

The HTML [`<input type="color">`](/en-US/docs/Web/HTML/Reference/Elements/input/color) element supports [`alpha`](/en-US/docs/Web/HTML/Reference/Elements/input/color#alpha) & [`colorspace`](/en-US/docs/Web/HTML/Reference/Elements/input/color#colorspace) attributes. ([Firefox bug 1919718](https://bugzil.la/1919718)).

- **`@container style()` queries** (Nightly): `layout.css.style-queries.enabled`

The [`@container`](/en-US/docs/Web/CSS/Reference/At-rules/@container) CSS at-rule supports [`style()`](/en-US/docs/Web/CSS/Guides/Containment/Container_size_and_style_queries#container_style_queries) queries. This allows you to check if a container has a valid CSS declaration, a CSS property, or a custom property, and apply styles to its children accordingly. ([Firefox bug 2014404](https://bugzil.la/2014404)).
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