Changed

• Drop warning from browser build (#18731)
• Drop exact duplicate declarations when emitting CSS (#18809)

Fixed

• Don't transition visibility when using transition (#18795)
• Discard matched variants with unknown named values (#18799)
• Discard matched variants with non-string values (#18799)
• Show suggestions for known matchVariant values (#18798)
• Replace deprecated clip with clip-path in sr-only (#18769)
• Hide internal fields from completions in matchUtilities (#18820)
• Ignore .vercel folders by default (can be overridden by @source … rules) (#18855)
• Consider variants starting with @- to be invalid (e.g. @-2xl:flex) (#18869)
• Do not allow custom variants to start or end with a - or _ (#18867, #18872)
• Upgrade: Migrate aria theme keys to @custom-variant (#18815)
• Upgrade: Migrate data theme keys to @custom-variant (#18816)
• Upgrade: Migrate supports theme keys to @custom-variant (#18817)

Fixed

• Don't consider the global important state in @apply (#18404)
• Add missing suggestions for flex-<number> utilities (#18642)
• Fix trailing ) from interfering with extraction in Clojure keywords (#18345)
• Detect classes inside Elixir charlist, word list, and string sigils (#18432)
• Track source locations through @plugin and @config (#18345)
• Allow boolean values of process.env.DEBUG in @tailwindcss/node (#18485)
• Ignore consecutive semicolons in the CSS parser (#18532)
• Center the dropdown icon added to an input with a paired datalist by default (#18511)
• Extract candidates in Slang templates (#18565)
• Improve error messages when encountering invalid functional utility names (#18568)
• Discard CSS AST objects with false or undefined properties (#18571)
• Allow users to disable URL rebasing in @tailwindcss/postcss via transformAssetUrls: false (#18321)
• Fix false-positive migrations in addEventListener and JavaScript variable names (#18718)
• Fix Standalone CLI showing default Bun help when run via symlink on Windows (#18723)
• Read from --border-color-* theme keys in divide-* utilities for backwards compatibility (#18704)
• Don't scan .hdr and .exr files for classes by default (#18734)

Fixed

• Add heuristic to skip candidate migrations inside emit(…) (#18330)
• Extract candidates with variants in Clojure/ClojureScript keywords (#18338)
• Document --watch=always in the CLI's usage (#18337)
• Add support for Vite 7 to @tailwindcss/vite (#18384)

Fixed

• Fix incorrectly generated CSS when using percentages in arbitrary values with calc (e.g. w-[calc(100%-var(--offset))]) (#18289)

Fixed

• Correctly parse custom properties with strings containing semicolons (#18251)
• Upgrade: Migrate arbitrary modifiers without percentage signs to bare values (e.g. /[0.16] → /16) (#18184)
• Upgrade: Migrate CSS variable shorthands where fallback value contains function call (#18184)
• Upgrade: Migrate negative arbitrary values to negative bare values (e.g. mb-[-32rem] → -mb-128) (#18212)
• Upgrade: Do not migrate blur in wire:model.blur (#18216)
• Don't add spaces around CSS dashed idents when formatting math expressions (#18220)

Added

• Improve error messages when @apply fails (#18059)

Fixed

• Upgrade: Do not migrate declarations that look like candidates in <style> blocks (#18057, 18068)
• Upgrade: Don't error when looking for tailwindcss in pnpm monorepos (#18065)
• Upgrade: Don't error when updating dependencies in pnpm monorepos (#18065)
• Upgrade: Migrate deprecated order-none to order-0 (#18126)
• Support Leptos class: attributes when extracting classes (#18093)
• Fix "Cannot read properties of undefined" crash on malformed arbitrary value (#18133)
• Upgrade: Migrate -mt-[0px] to mt-[0px] instead of the other way around (#18154)
• Fix Haml pre-processing crash when there is no \n at the end of the file (#18155)
• Ignore .pnpm-store folders by default (can be overridden by @source … rules) (#18163)
• Fix PostCSS crash when calling toJSON() (#18083)

Added

• Upgrade: Migrate bare values to named values (#18000)
• Upgrade: Added cache to improve template migration performance (#18025)

Fixed

• Allow _ before numbers during candidate extraction (#17961)
• Prevent duplicate suggestions when using @theme and @utility together (#17675)
• Ensure that media queries within ::before and ::after pseudo selectors create valid CSS rules in production builds (#17979)
• Ensure that the standalone CLI does not leave temporary files behind (#17981)
• Ensure -rotate-* utilities properly negate arbitrary values (#18014)
• Ignore custom variants using :merge(…) selectors in legacy JS plugins (#18020)
• Ensure classes containing . are properly extracted from Clojure files (#18038)
• Upgrade: Fix error when using @import … source(…) (#17963)
• Upgrade: Change casing of utilities with named values to kebab-case to match updated theme variables (#18017)
• Upgrade: Don't migrate strings that match utility names in Vue attribute bindings other than class (#18025)

Added

• Upgrade: Automatically convert arbitrary values to named values when possible (e.g. h-[1lh] to h-lh) (#17831, #17854)
• Upgrade: Update dependencies in parallel for improved performance (#17898)
• Add detailed logging about @source directives, discovered files and scanned files when using DEBUG=* (#17906, #17952)
• Add support for generating source maps in development (#17775)

Fixed

• Ensure negative arbitrary scale values generate negative values (#17831)
• Fix HAML extraction with embedded Ruby (#17846)
• Don't scan files for utilities when using @reference (#17836)
• Fix incorrectly replacing _ with in arbitrary modifier shorthand bg-red-500/(--my_opacity) (#17889)
• Don't scan .log files for classes by default (#17906)
• Ensure that custom utilities applying other custom utilities don't swallow nested @apply rules (#17925)
• Download platform specific package if optionalDependencies are skipped (#17929)

Added

• Support using @tailwindcss/upgrade to upgrade between versions of v4.* (#17717)
• Add h-lh / min-h-lh / max-h-lh utilities (#17790)
• Transition display, visibility, content-visibility, overlay, and pointer-events when using transition to simplify @starting-style usage (#17812)

Fixed

• Don't scan .geojson or .db files for classes by default (#17700, #17711)
• Hide default shadow suggestions when missing default shadow theme keys (#17743)
• Replace _ with . in theme suggestions for @utility if surrounded by digits (#17733)
• Skip color-mix(…) when opacity is 100% (#17815)
• PostCSS: Ensure that errors in imported stylesheets are recoverable (#17754)
• Upgrade: Bump all Tailwind CSS related dependencies during upgrade (#17763)
• Upgrade: Don't add - to variants starting with @ (#17814)
• Upgrade: Don't format stylesheets that didn't change when upgrading (#17824)

Added

• Add experimental @tailwindcss/oxide-wasm32-wasi target for running Tailwind in browser environments like StackBlitz (#17558)

Fixed

• Ensure color-mix(…) polyfills do not cause used CSS variables to be removed (#17555)
• Ensure color-mix(…) polyfills create fallbacks for theme variables that reference other theme variables (#17562)
• Fix brace expansion in declining ranges like {10..0..5} and {0..10..-5} (#17591)
• Work around a Chrome rendering bug when using the skew-* utilities (#17627)
• Ensure container query variant names can contain hyphens (#17628)
• Ensure shadow-inherit, inset-shadow-inherit, drop-shadow-inherit, and text-shadow-inherit inherit the shadow color (#17647)
• Ensure compatibility with array tuples used in fontSize JS theme keys (#17630)
• Ensure folders with binary file extensions in their names are scanned for utilities (#17595)
• Upgrade: Convert fontSize array tuple syntax to CSS theme variables (#17630)