diff --git a/features/draft/spec/css-mixins-1.yml b/features/draft/spec/css-mixins-1.yml
deleted file mode 100644
index 7477585727d..00000000000
--- a/features/draft/spec/css-mixins-1.yml
+++ /dev/null
@@ -1,17 +0,0 @@
-draft_date: 2025-08-15
-name: CSS Functions and Mixins Module
-description: TODO
-spec: https://drafts.csswg.org/css-mixins-1/
-compat_features:
-  - api.CSSFunctionDeclarations
-  - api.CSSFunctionDeclarations.style
-  - api.CSSFunctionDescriptors
-  - api.CSSFunctionDescriptors.result
-  - api.CSSFunctionRule
-  - api.CSSFunctionRule.getParameters
-  - api.CSSFunctionRule.name
-  - api.CSSFunctionRule.returnType
-  - css.at-rules.function
-  - css.at-rules.function.result
-  - css.types.dashed-function
-  - css.types.type
diff --git a/features/draft/spec/css-mixins-1.yml.dist b/features/draft/spec/css-mixins-1.yml.dist
deleted file mode 100644
index 019de2dea51..00000000000
--- a/features/draft/spec/css-mixins-1.yml.dist
+++ /dev/null
@@ -1,22 +0,0 @@
-# Generated from: css-mixins-1.yml
-# Do not edit this file by hand. Edit the source file instead!
-
-status:
-  baseline: false
-  support:
-    chrome: "139"
-    chrome_android: "139"
-    edge: "139"
-compat_features:
-  - api.CSSFunctionDeclarations
-  - api.CSSFunctionDeclarations.style
-  - api.CSSFunctionDescriptors
-  - api.CSSFunctionDescriptors.result
-  - api.CSSFunctionRule
-  - api.CSSFunctionRule.getParameters
-  - api.CSSFunctionRule.name
-  - api.CSSFunctionRule.returnType
-  - css.at-rules.function
-  - css.at-rules.function.result
-  - css.types.dashed-function
-  - css.types.type
diff --git a/features/function.yml b/features/function.yml
index 44502217bd4..b7706df541e 100644
--- a/features/function.yml
+++ b/features/function.yml
@@ -2,4 +2,16 @@ name: "@function"
 description: "The `@function` CSS at-rule defines a custom function that takes CSS values or custom properties as arguments, and returns a CSS value. It can be based on conditional logic such as by using the `@media` at-rule."
 spec: https://drafts.csswg.org/css-mixins-1/#function-rule
 group: css
-# No compat keys yet, this feature is planned to ship with Chromium 139
+compat_features:
+  - api.CSSFunctionDeclarations
+  - api.CSSFunctionDeclarations.style
+  - api.CSSFunctionDescriptors
+  - api.CSSFunctionDescriptors.result
+  - api.CSSFunctionRule
+  - api.CSSFunctionRule.getParameters
+  - api.CSSFunctionRule.name
+  - api.CSSFunctionRule.returnType
+  - css.at-rules.function
+  - css.at-rules.function.result
+  - css.types.dashed-function
+  - css.types.type
diff --git a/features/function.yml.dist b/features/function.yml.dist
index c09639bbe4f..7465fbdfda7 100644
--- a/features/function.yml.dist
+++ b/features/function.yml.dist
@@ -3,4 +3,20 @@
 
 status:
   baseline: false
-  support: {}
+  support:
+    chrome: "139"
+    chrome_android: "139"
+    edge: "139"
+compat_features:
+  - api.CSSFunctionDeclarations
+  - api.CSSFunctionDeclarations.style
+  - api.CSSFunctionDescriptors
+  - api.CSSFunctionDescriptors.result
+  - api.CSSFunctionRule
+  - api.CSSFunctionRule.getParameters
+  - api.CSSFunctionRule.name
+  - api.CSSFunctionRule.returnType
+  - css.at-rules.function
+  - css.at-rules.function.result
+  - css.types.dashed-function
+  - css.types.type