diff --git a/packages/css/CHANGELOG.md b/packages/css/CHANGELOG.md
index a3ff42f596b6..98ff749e189c 100644
--- a/packages/css/CHANGELOG.md
+++ b/packages/css/CHANGELOG.md
@@ -7,6 +7,17 @@ Webref adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html),
 applied to data. A new major version is released whenever a breaking change is
 made to the data structure.
 
+## v8.0.0 - 2025-10-17
+
+### Breaking change
+
+Subsidiary at-rules are now reported at the root level, scoped to their parent at-rule through a `for` property.
+
+### How to upgrade
+
+Unless you're processing at-rules and only expecting unscoped ones, upgrade from version 7 should not require any code update. If you need to list only unscoped at-rules, filter out those that have a `for` property.
+
+
 ## v7.0.11 - 2025-09-04
 
 CSS extracts are now consolidated into a single file.
diff --git a/packages/css/README.md b/packages/css/README.md
index 3f1178323976..ea926fcb7265 100644
--- a/packages/css/README.md
+++ b/packages/css/README.md
@@ -51,6 +51,7 @@ const ast = definitionSyntax.parse(properties['flex'].syntax);
 Additional keys may be set depending on the type of the CSS feature. For example:
 
 - At-rules have a `descriptors` key that contains the list of descriptors defined for the given at-rule. That list may not be exhaustive. For example, it does not contain descriptors that are only implicitly defined in specs, such as families of properties that some at-rules (e.g, `@position-try`) accept as descriptors.
+- At-rule that are scoped to another at-rules have a `for` key that contains the list of scoping at-rules.
 - Functions and types that are scoped to a property or other feature have a `for` key that contains the list of scoping features for that feature. A scoping feature may be a property, a function or a type. When the scoping feature is a type, its name in the `for` key is enclosed between `<` and `>`.
 - Properties have a `styleDeclaration` key that contains the list of IDL attribute names that the property generates. A number of other keys may be set to describe the property's initial value, animation type and other parameters.
 
diff --git a/packages/css/package.json b/packages/css/package.json
index d45343cfc9c0..aeced2a1b502 100644
--- a/packages/css/package.json
+++ b/packages/css/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@webref/css",
   "description": "CSS definitions of the web platform",
-  "version": "7.1.5",
+  "version": "8.0.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/w3c/webref.git"