css-color-parser: update contrast color notation

Author: romainmenke

packages/css-color-parser/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changes to CSS Color Parser
 
+### Unreleased (patch)
+
+- Assign `rgb` color notation to `contrast-color()` (instead of `srgb`).
+
 ### 4.1.2
 
 _June 10, 2026_

packages/css-color-parser/dist/index.mjs

@@ -36,7 +36,7 @@ export function contrastColor(colorMixNode: FunctionNode, colorParser: ColorPars
 	backgroundColorData.colorNotation = ColorNotation.sRGB;
 
 	const colorData: ColorData = {
-		colorNotation: ColorNotation.sRGB,
+		colorNotation: ColorNotation.RGB,
 		channels: [0, 0, 0],
 		alpha: 1,
 		syntaxFlags: new Set([SyntaxFlag.ContrastColor, SyntaxFlag.Experimental]),

packages/css-color-parser/src/functions/contrast-color.ts

@@ -58,3 +58,23 @@ for (const test of tests) {
 		);
 	});
 }
+
+assert.deepStrictEqual(
+	color(parse('white')),
+	{
+		colorNotation: 'rgb',
+		channels: [1, 1, 1],
+		alpha: 1,
+		syntaxFlags: new Set(['color-keyword', 'named-color']),
+	},
+);
+
+assert.deepStrictEqual(
+	color(parse('contrast-color(black)')),
+	{
+		colorNotation: 'rgb',
+		channels: [1, 1, 1],
+		alpha: 1,
+		syntaxFlags: new Set(['contrast-color', 'experimental']),
+	},
+);