added release notes for nested @container style() queries (mdn#43839)

Author: dletorey

files/en-us/mozilla/firefox/experimental_features/index.md

@@ -349,7 +349,7 @@ The {{cssxref("attr")}} CSS function now supports [`<attr-type>`](/en-US/docs/We
 
 ### Namespaced attributes in `attr()` CSS function
 
-The {{cssxref("attr")}} CSS function now accepts [namespaced attributes](/en-US/docs/Web/CSS/Reference/Values/attr#namespaces). This allows you to take attributes from elements of [XML](/en-US/docs/Web/XML)-based languages, such as [SVG](/en-US/docs/Web/SVG) and style them accordingly. ([Firefox bug 2014060](https://bugzil.la/2014060))
+The {{cssxref("attr")}} CSS function now accepts [namespaced attributes](/en-US/docs/Web/CSS/Reference/Values/attr#namespaces). This allows you to take attributes from elements of [XML](/en-US/docs/Web/XML)-based languages, such as [SVG](/en-US/docs/Web/SVG) and style them accordingly. ([Firefox bug 2014060](https://bugzil.la/2014060).
 
 | Release channel   | Version added | Enabled by default? |
 | ----------------- | ------------- | ------------------- |
@@ -363,7 +363,7 @@ The {{cssxref("attr")}} CSS function now accepts [namespaced attributes](/en-US/
 
 ### `@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)).
+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)), [Firefox bug 2014098](https://bugzil.la/2014098)).
 
 | Release channel   | Version added | Enabled by default? |
 | ----------------- | ------------- | ------------------- |

files/en-us/mozilla/firefox/releases/150/index.md

@@ -138,6 +138,10 @@ You can find more such features on the [Experimental features](/en-US/docs/Mozil
 
   The {{cssxref("attr")}} CSS function now accepts [namespaced attributes](/en-US/docs/Web/CSS/Reference/Values/attr#namespaces). This allows you to take attributes from elements of [XML](/en-US/docs/Web/XML)-based languages, such as [SVG](/en-US/docs/Web/SVG) and style them accordingly. ([Firefox bug 2014060](https://bugzil.la/2014060))
 
+- **`@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 has been updated to support the nesting of `style()` queries. ([Firefox bug 2014098](https://bugzil.la/2014098)).
+
 - **Absolutely positioned elements in multi-column containers and when printing**: `layout.abspos.fragmentainer-aware-positioning.enabled`
 
   Absolutely positioned elements inside [multi-column containers](/en-US/docs/Web/CSS/Guides/Multicol_layout) and when printing are now correctly positioned and fragmented. This improves interoperability with other browsers and prevents layout issues such as overlapping text or content loss. ([Firefox bug 2018797](https://bugzil.la/2018797)).