Added

• Add @tailwindcss/browser package to run Tailwind CSS in the browser (#15558)
• Add @reference "…" API as a replacement for the previous @import "…" reference option (#15565)
• Add support for defining functional utilities in CSS (#15455)
• Add new --spacing(…), --alpha(…), and --theme(…) CSS functions (#15572)
• Add musl-based Linux builds of the standalone CLI (#15567)
• Improve performance of internal AST manipulations (#15529)

Fixed

• Use the correct property value for place-content-between, place-content-around, and place-content-evenly utilities (#15440)
• Don’t detect arbitrary properties when preceded by an escape (#15456)
• Fix incorrectly named bg-round and bg-space utilities to bg-repeat-round to bg-repeat-space (#15462)
• Fix inset-shadow-* suggestions in IntelliSense (#15471)
• Only compile arbitrary values ending in ] (#15503)
• Ensure @apply rules are processed in the correct order (#15542)
• Allow negative utility names in @utility (#15573)
• Remove all @keyframes contributed by JavaScript plugins when using @reference imports (#15581)
• Upgrade (experimental): Do not extract class names from functions (e.g. shadow in filter: 'drop-shadow(…)') (#15566)
• Upgrade (experimental): Migrate theme(spacing.2) to --spacing(2) (#15579)
• Upgrade (experimental): Migrate theme(…) to --theme(…) (#15579)

Changed

• Remove --container-prose in favor of a deprecated --max-width-prose theme variable so that *-prose is only available for max-width utilities and only for backward compatibility (#15439)
• Use Vite post-processor APIs for processing Svelte <style> blocks (#15436)

Fixed

• Ensure Symbol.dispose and Symbol.asyncDispose are polyfilled (#15404)

Fixed

• Work around Node v22.12+ issue (#15421)

Added

• Export tailwindcss/lib/util/flattenColorPalette for backward compatibility (#15318)
• Improve debug logs to get better insights (#15303)

Fixed

• Fix dependency related warnings when using @tailwindcss/postcss on Windows (#15321)
• Skip creating a compiler for CSS files that should not be processed (#15340)
• Fix missing shadow-none suggestion in IntelliSense (#15342)
• Optimize AST before printing for IntelliSense (#15347)
• Generate vendor prefixes for Chrome 111+ (e.g. -webkit-background-clip: text) (#15389)

Changed

• Rename --aspect-ratio-* theme key to --aspect-* (#15365)
• Derive aspect-video utility from theme (#15365)

Fixed

• Ensure @import "…" reference never generates utilities (#15307)

Added

• Parallelize parsing of individual source files (#15270)
• Add new @import "…" reference option for importing Tailwind CSS configuration details into another CSS entry point without duplicating CSS (#15228)
• Improve performance of @tailwindcss/postcss by translating between internal data structures and PostCSS nodes directly without additional parsing or stringification (#15297)

Fixed

• Ensure absolute URLs inside imported CSS files are not rebased when using @tailwindcss/vite (#15275)
• Fix issues with dev servers using Svelte 5 with @tailwindcss/vite (#15274)
• Support installing @tailwindcss/vite in Vite 6 projects (#15274)
• Fix resolution of imported CSS files in SSR builds with @tailwindcss/vite (#15279)
• Ensure other plugins can run after @tailwindcss/postcss (#15273)
• Rebase URLs inside imported CSS files when using Vite with the @tailwindcss/postcss extension (#15273)
• Fix missing font family suggestions in IntelliSense (#15288)
• Fix missing @container suggestion in IntelliSense (#15288)

Fixed

• Ensure the TypeScript types for PluginsConfig allow undefined values (#14668)

Changed

• Bumped lilconfig to v3.x (#15289)

Fixed

• Don't scan source files for utilities unless @tailwind utilities is present in the CSS in @tailwindcss/postcss and @tailwindcss/vite (#15226)
• Skip reserializing CSS files that don't use Tailwind features in @tailwindcss/postcss and @tailwindcss/vite (#15226)
• Upgrade (experimental): Do not migrate the overflow-clip utility (#15244)
• Upgrade (experimental): Rename backdrop-blur to backdrop-blur-sm and backdrop-blur-sm to backdrop-blur-xs (#15242)

Fixed

• Ensure any necessary vendor prefixes are generated for iOS Safari, Firefox, and Chrome (#15166)
• Ensure .group and .peer are prefixed when using the prefix(…) option (#15174)
• Ensure 3D transforms render correctly in Safari (#15179)
• Ensure --spacing-* variables take precedence over --container-* variables (#15180)
• Fix scanning classes delimited by tab characters (#15169)
• Ensure opacity modifiers and semi-transparent gradients render correctly by default in Safari (#15201)
• Fix element size thrashing when transitioning gradients on elements with a defined font-size in Safari (#15216)
• Ensure translate-* utilities work with arbitrary values that use calc(…) (#15215)
• Ensure gradient stop position utilities work with arbitrary values that use calc(…) (#15215)
• Ensure Node addons are packaged correctly with Windows ARM builds (#15171)
• Ensure the Vite plugin resolves CSS and JS files according to the configured resolver conditions ([#15173])(#15173)
• Upgrade (experimental): Migrate prefixes for .group and .peer classes (#15208)

Changed

• Interpolate gradients using OKLAB instead of OKLCH by default (#15201)
• Error when layer(…) in @import is not first in the list of functions/conditions (#15109)
• Use unitless line-height values for font-size variables in default theme (#15216)
• Don't register custom properties with explicit types unless those custom properties need to be animateable (#15215)

Fixed

• Use configured --letter-spacing values for custom font size utilities (#15099)
• Ensure space-x/y-* and divide-x/y-* with variants can undo space-x/y-reverse and divide-x/y-reverse (#15094)
• Don't print minified code when the build fails in the CLI (#15106)
• Generate the correct CSS for the break-keep utility (#15108)
• Detect single word utilities that include numbers (e.g. h1) when scanning files (#15110)
• Upgrade (experimental): Always add layer(…) as the first param to @import (#15102)

Changed

• Revert the new base styles for buttons and form controls (#15100)