Add color-function-display-p3-linear and alpha-function (#465)

* Bump the all-dependencies group across 1 directory with 5 updates

Bumps the all-dependencies group with 5 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [@mdn/browser-compat-data](https://github.com/mdn/browser-compat-data) | `6.0.33` | `6.1.1` |
| [browserslist](https://github.com/browserslist/browserslist) | `4.25.1` | `4.25.2` |
| [stylelint](https://github.com/stylelint/stylelint) | `16.22.0` | `16.23.1` |
| [stylelint-config-standard](https://github.com/stylelint/stylelint-config-standard) | `38.0.0` | `39.0.0` |
| [web-features](https://github.com/web-platform-dx/web-features/tree/HEAD/packages/web-features) | `2.41.2` | `2.43.1` |



Updates `@mdn/browser-compat-data` from 6.0.33 to 6.1.1
- [Release notes](https://github.com/mdn/browser-compat-data/releases)
- [Changelog](https://github.com/mdn/browser-compat-data/blob/main/RELEASE_NOTES.md)
- [Commits](mdn/browser-compat-data@v6.0.33...v6.1.1)

Updates `browserslist` from 4.25.1 to 4.25.2
- [Release notes](https://github.com/browserslist/browserslist/releases)
- [Changelog](https://github.com/browserslist/browserslist/blob/main/CHANGELOG.md)
- [Commits](browserslist/browserslist@4.25.1...4.25.2)

Updates `stylelint` from 16.22.0 to 16.23.1
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/main/CHANGELOG.md)
- [Commits](stylelint/stylelint@16.22.0...16.23.1)

Updates `stylelint-config-standard` from 38.0.0 to 39.0.0
- [Release notes](https://github.com/stylelint/stylelint-config-standard/releases)
- [Changelog](https://github.com/stylelint/stylelint-config-standard/blob/main/CHANGELOG.md)
- [Commits](stylelint/stylelint-config-standard@38.0.0...39.0.0)

Updates `web-features` from 2.41.2 to 2.43.1
- [Release notes](https://github.com/web-platform-dx/web-features/releases)
- [Commits](https://github.com/web-platform-dx/web-features/commits/v2.43.1/packages/web-features)

---
updated-dependencies:
- dependency-name: "@mdn/browser-compat-data"
  dependency-version: 6.1.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: all-dependencies
- dependency-name: browserslist
  dependency-version: 4.25.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: all-dependencies
- dependency-name: stylelint
  dependency-version: 16.23.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: all-dependencies
- dependency-name: stylelint-config-standard
  dependency-version: 39.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: all-dependencies
- dependency-name: web-features
  dependency-version: 2.43.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: all-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

* Added: color-function-display-p3-linear

* Add alpha-function

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: romainmenke

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changes to cssdb
 
+### 8.4.0 (August 20, 2025)
+
+- Added `color-function-display-p3-linear`
+- Added `alpha-function`
+- Updated `@mdn/browser-compat-data` to `6.1.4`
+
 ### 8.3.1 (June 23, 2025)
 
 - Updated `@mdn/browser-compat-data` to `6.0.25`

cssdb.json

@@ -33,6 +33,23 @@
     ],
     "vendors_implementations": 3
   },
+  {
+    "id": "alpha-function",
+    "title": "`alpha()` Function",
+    "description": "Relative alpha colors",
+    "specification": "https://drafts.csswg.org/css-color-5/#relative-alpha",
+    "stage": 2,
+    "browser_support": {},
+    "docs": {},
+    "example": "p {\n  color: alpha(from red / calc(alpha * 0.5));\n}",
+    "polyfills": [
+      {
+        "type": "PostCSS Plugin",
+        "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-alpha-function"
+      }
+    ],
+    "vendors_implementations": 0
+  },
   {
     "id": "any-link-pseudo-class",
     "title": "`:any-link` Hyperlink Pseudo-Class",
@@ -310,6 +327,23 @@
     "vendors_implementations": 3,
     "web-feature": "color-function"
   },
+  {
+    "id": "color-function-display-p3-linear",
+    "title": "The `display-p3-linear` Color Space for the `color()` Function",
+    "description": "The `display-p3-linear` predefined color space is the same as `display-p3` except that the transfer function is linear-light.",
+    "specification": "https://drafts.csswg.org/css-color-4/#predefined-display-p3-linear",
+    "stage": 2,
+    "browser_support": {},
+    "docs": {},
+    "example": "p {\n  color: color(display-p3-linear 0.3081 0.014 0.0567);\n}",
+    "polyfills": [
+      {
+        "type": "PostCSS Plugin",
+        "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-function-display-p3-linear"
+      }
+    ],
+    "vendors_implementations": 0
+  },
   {
     "id": "color-functional-notation",
     "title": "Color Functional Notation",
@@ -2086,22 +2120,28 @@
     "specification": "https://www.w3.org/TR/css-values-4/#sign-funcs",
     "stage": 2,
     "browser_support": {
+      "and_chr": "138",
       "and_ff": "118",
+      "android": "138",
+      "chrome": "138",
+      "edge": "138",
       "firefox": "118",
       "ios_saf": "15.4",
+      "op_mob": "91",
       "safari": "15.4"
     },
     "docs": {
       "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/sign"
     },
     "example": "div {\n  order: abs(-10);\n  order: sign(-10);\n}",
+    "interoperable_at": 1750896000,
     "polyfills": [
       {
         "type": "PostCSS Plugin",
         "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-sign-functions"
       }
     ],
-    "vendors_implementations": 2
+    "vendors_implementations": 3
   },
   {
     "id": "src-function",

cssdb.mjs

@@ -33,6 +33,23 @@ export default [
     ],
     "vendors_implementations": 3
   },
+  {
+    "id": "alpha-function",
+    "title": "`alpha()` Function",
+    "description": "Relative alpha colors",
+    "specification": "https://drafts.csswg.org/css-color-5/#relative-alpha",
+    "stage": 2,
+    "browser_support": {},
+    "docs": {},
+    "example": "p {\n  color: alpha(from red / calc(alpha * 0.5));\n}",
+    "polyfills": [
+      {
+        "type": "PostCSS Plugin",
+        "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-alpha-function"
+      }
+    ],
+    "vendors_implementations": 0
+  },
   {
     "id": "any-link-pseudo-class",
     "title": "`:any-link` Hyperlink Pseudo-Class",
@@ -310,6 +327,23 @@ export default [
     "vendors_implementations": 3,
     "web-feature": "color-function"
   },
+  {
+    "id": "color-function-display-p3-linear",
+    "title": "The `display-p3-linear` Color Space for the `color()` Function",
+    "description": "The `display-p3-linear` predefined color space is the same as `display-p3` except that the transfer function is linear-light.",
+    "specification": "https://drafts.csswg.org/css-color-4/#predefined-display-p3-linear",
+    "stage": 2,
+    "browser_support": {},
+    "docs": {},
+    "example": "p {\n  color: color(display-p3-linear 0.3081 0.014 0.0567);\n}",
+    "polyfills": [
+      {
+        "type": "PostCSS Plugin",
+        "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-function-display-p3-linear"
+      }
+    ],
+    "vendors_implementations": 0
+  },
   {
     "id": "color-functional-notation",
     "title": "Color Functional Notation",
@@ -2086,22 +2120,28 @@ export default [
     "specification": "https://www.w3.org/TR/css-values-4/#sign-funcs",
     "stage": 2,
     "browser_support": {
+      "and_chr": "138",
       "and_ff": "118",
+      "android": "138",
+      "chrome": "138",
+      "edge": "138",
       "firefox": "118",
       "ios_saf": "15.4",
+      "op_mob": "91",
       "safari": "15.4"
     },
     "docs": {
       "mdn": "https://developer.mozilla.org/en-US/docs/Web/CSS/sign"
     },
     "example": "div {\n  order: abs(-10);\n  order: sign(-10);\n}",
+    "interoperable_at": 1750896000,
     "polyfills": [
       {
         "type": "PostCSS Plugin",
         "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-sign-functions"
       }
     ],
-    "vendors_implementations": 2
+    "vendors_implementations": 3
   },
   {
     "id": "src-function",

cssdb.settings.json

@@ -18,6 +18,22 @@
       }
     ]
   },
+  {
+    "id": "alpha-function",
+    "title": "`alpha()` Function",
+    "description": "Relative alpha colors",
+    "specification": "https://drafts.csswg.org/css-color-5/#relative-alpha",
+    "stage": 2,
+    "browser_support": {},
+    "docs": {},
+    "example": "p {\n  color: alpha(from red / calc(alpha * 0.5));\n}",
+    "polyfills": [
+      {
+        "type": "PostCSS Plugin",
+        "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-alpha-function"
+      }
+    ]
+  },
   {
     "id": "any-link-pseudo-class",
     "title": "`:any-link` Hyperlink Pseudo-Class",
@@ -201,6 +217,23 @@
       }
     ]
   },
+  {
+    "id": "color-function-display-p3-linear",
+    "title": "The `display-p3-linear` Color Space for the `color()` Function",
+    "description": "The `display-p3-linear` predefined color space is the same as `display-p3` except that the transfer function is linear-light.",
+    "specification": "https://drafts.csswg.org/css-color-4/#predefined-display-p3-linear",
+    "stage": 2,
+    "browser_support": {},
+    "docs": {},
+    "example": "p {\n  color: color(display-p3-linear 0.3081 0.014 0.0567);\n}",
+    "mdn_path": [],
+    "polyfills": [
+      {
+        "type": "PostCSS Plugin",
+        "link": "https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-color-function-display-p3-linear"
+      }
+    ]
+  },
   {
     "id": "color-functional-notation",
     "title": "Color Functional Notation",