Update changelog and add feature flag

Author: philipp-spiess

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- _Experimental_: Add `details-content` variant ([#15319](https://github.com/tailwindlabs/tailwindcss/pull/15319))
 - _Experimental_: Add `inverted-colors` variant ([#11693](https://github.com/tailwindlabs/tailwindcss/pull/11693))
 - _Experimental_: Add `user-valid` and `user-invalid` variants ([#12370](https://github.com/tailwindlabs/tailwindcss/pull/12370))
 - _Experimental_: Add `wrap-anywhere`, `wrap-break-word`, and `wrap-normal` utilities ([#12128](https://github.com/tailwindlabs/tailwindcss/pull/12128))

packages/tailwindcss/src/feature-flags.ts

@@ -1,3 +1,4 @@
+export const enableDetailsContent = process.env.FEATURES_ENV !== 'stable'
 export const enableInvertedColors = process.env.FEATURES_ENV !== 'stable'
 export const enableUserValid = process.env.FEATURES_ENV !== 'stable'
 export const enableWrapAnywhere = process.env.FEATURES_ENV !== 'stable'

packages/tailwindcss/src/variants.ts

@@ -12,7 +12,7 @@ import {
   type StyleRule,
 } from './ast'
 import { type Variant } from './candidate'
-import { enableInvertedColors, enableUserValid } from './feature-flags'
+import { enableDetailsContent, enableInvertedColors, enableUserValid } from './feature-flags'
 import type { Theme } from './theme'
 import { compareBreakpoints } from './utils/compare-breakpoints'
 import { DefaultMap } from './utils/default-map'
@@ -628,7 +628,9 @@ export function createVariants(theme: Theme): Variants {
   staticVariant('file', ['&::file-selector-button'])
   staticVariant('placeholder', ['&::placeholder'])
   staticVariant('backdrop', ['&::backdrop'])
-  staticVariant('details-content', ['&::details-content'])
+  if (enableDetailsContent) {
+    staticVariant('details-content', ['&::details-content'])
+  }
 
   {
     function contentProperties() {