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Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ tailwindcss (4.3.0 → 4.3.4) · Repo · Changelog

Release Notes

4.3.4

Added

• Add @tailwindcss/turbopack, a Turbopack loader for using Tailwind CSS with Next.js (#20367)

Fixed

• Ensure watch mode detects changes to symlinked @source files whose real paths aren't otherwise scanned (#20356)
• Ensure variants using @scope wrap generated utilities instead of nesting inside them (#20369)
• Ensure nested @scope rules preserve their scoping semantics when flattened (#20369)
• Preserve declarations directly inside @scope by wrapping them in :where(:scope) (#20369)
• Ensure generated utilities include a space in empty var() fallbacks (e.g. var(--tw-blur,) → var(--tw-blur, )) (#20373)
• Canonicalization: convert arbitrary breakpoint and container query variants to named equivalents (e.g. max-[64rem]:flex → max-lg:flex) (#20380)
• Prevent @tailwindcss/vite from crashing on every edit under Vite's experimental bundledDev mode (#20379)
• Ensure @tailwindcss/oxide falls back to WASM on platforms without native bindings (#20383)
• Extract class candidates from Ruby %w and %W literals using angle brackets or custom delimiters (e.g. %w<flex>, %w|flex|), including in Slim and Haml templates (#20387)
• Preserve whitespace in --default(…) values in functional @utility definitions (e.g. --default(box alphabetic) no longer becomes boxalphabetic) (#20392)
• Ensure automatic source detection respects negation-based .gitignore files (e.g. /* followed by !/… patterns) (#20397)
• Ensure root theme('…') namespace lookups in JavaScript plugins and config files return the full namespace object instead of the value of its DEFAULT key (#20399)
• Skip ignored directories when generating watch globs instead of walking their contents on every rebuild (#20408)
• Drop invalid UTF-8 candidates during class detection (#20389)
• Prevent @tailwindcss/vite from forcing full-page reloads for scanned files that Vite does not handle as modules (e.g. .php files) (#20414)
• Canonicalization: don't merge utilities that reference different theme variables set to CSS-wide keywords like unset (#20417)
• Don't generate utilities when a modifier is used that would otherwise be silently ignored (e.g. rounded-sm/[5], shadow-sm/foo, stroke-2/50) (#20419)
• Preserve and, or, and not inside selectors in supports-[…] variants (e.g. supports-[selector(a:not(.foo))]:flex) (#20420)
• Don't warn about Angular's ::ng-deep and :host-context() when optimizing CSS (#20434)
• Don't generate CSS for candidates containing an empty additional modifier (e.g. bg-red-500/50/ and group-hover/foo//bar:flex) (#20466)
• Ensure min-*, max-*, and container query variants with decimal values are sorted numerically (e.g. min-[40.25rem] before min-[40.5rem]) (#20512)
• Ensure CSS comments ending with \*/ are closed correctly instead of swallowing the CSS that follows (e.g. /* C:\temp\*/) (#20508)
• Improve style invalidation performance of group-* and peer-* variants (#20513)
• Ensure cached compilers release their loadModule and loadStylesheet callbacks after compilation (#20531)
• Canonicalization: preserve & when moving a pseudo-element into * or ** (e.g. [&_::before]:flex → **:[&::before]:flex) (#20550)
• Ensure the Set.prototype.intersection polyfill in canonicalizeCandidates(…) returns the intersection instead of the first set on Node.js < 22 (#20562)
• Canonicalization: ensure inline theme(…) alphas with more than 2 decimals migrate to a percentage modifier with the same opacity (e.g. theme(colors.red.500/.12345) → text-red-500/[12.345%], not text-red-500/[12.345]) (#20563)
• Canonicalization: preserve inline theme(…) alphas as an arbitrary percentage when a custom --opacity-* theme value would change the opacity (e.g. theme(colors.red.500/50%) → text-red-500/[50%] with --opacity-50: 10%) (#20563)
• Ensure the @property fallback isn't applied in Safari versions that no longer support margin-trim: inline (#20569)
• Treat viewport units like dvmin and svi and font-relative units like cap and rex as lengths in arbitrary values (e.g. text-[10dvmin] generates font-size instead of color) (#20516)
• Write plugin logs to stderr in tailwindcss canonicalize so they don't end up in the results on stdout (#20561)
• Extract class shorthands on later lines when Pug text, comments, or quoted attribute values contain unbalanced brackets, or a quote that doesn't start a string (e.g. input(pattern=/"/.source)) (#20547, #20572)
• Underline the correct occurrence of an unsupported data type in --value(…) warnings (#20554)
• Canonicalization: prefer an existing candidate when collapsing utilities over another utility with the same default theme value (e.g. text-foreground text-primary → text-primary, not text-card-checked-border) (#20540)
• Canonicalization: don't collapse utilities into a utility that uses another theme variable with the same default value (e.g. mt-card mb-card → my-card, not my-4) (#20574)
• Ensure @tailwindcss/postcss rewrites relative url(…)s of stylesheets that are inlined before it runs (e.g. @imports in Vite) in optimized builds (#20576)
• Drop nested rules that put a combinator after a pseudo-element when using pseudo-element variants (e.g. selection:* on a utility with a nested & > * rule) (#20575)
• Don't generate CSS for arbitrary values with unbalanced parentheses or brackets (e.g. w-[calc(1px] or [--x:a[b]) (#20577)
• Canonicalization: prevent collapse: true from taking exponentially longer when classes are linked through a utility that sets many properties (e.g. sr-only) (#20558)
• Ensure & is substituted inside :-moz-any(…) and :-webkit-any(…) in custom variants (e.g. @custom-variant firefox (:-moz-any(&));) (#20486)
• Ensure the standalone macOS binaries have a valid code signature, so macOS 27 no longer kills them at launch (#20578)
• Ensure @tailwindcss/turbopack and @tailwindcss/webpack rebuild when the input CSS changes (e.g. next dev with Turbopack no longer serves the CSS of the previous edit) (#20582)
• Canonicalization: don't drop a utility that sets a --tw-* variable when an unrelated property has the same value (e.g. link mt-4 no longer becomes mt-4 when link sets margin-top: 16px and --tw-translate-x: 16px) (#20593)
• Decode single-digit hexadecimal escapes in theme variable and @utility names as the CSS spec does (e.g. @theme { --color-\0: red; } no longer registers --color-0) (#20591)
• Don't treat !important inside strings, comments or url() in declaration values as the important flag (e.g. content: "a !important b") (#20627)
• Parse a custom property at the end of the input when it has no trailing ; (e.g. --foo: bar as the last declaration) (#20653)
• Keep a declaration without a ; at the end of the CSS input (e.g. color: red) (#20655)

4.3.3

Fixed

• Support --watch --poll[=ms] in @tailwindcss/cli when filesystem events are unreliable or unavailable (#20297)
• Canonicalization: match arbitrary hex colors against theme colors case-insensitively (e.g. bg-[#fff] and bg-[#FFF] → bg-white) (#20298)
• Prevent Preflight from overriding Firefox's native iframe:focus-visible outline styles (#20292)
• Ensure theme('colors.foo') in JS plugins resolves correctly when both --color-foo and --color-foo-bar exist (#20299)
• Ensure fractional opacity modifiers work with named shadow sizes like shadow-sm/12.5, text-shadow-sm/12.5, drop-shadow-sm/12.5, and inset-shadow-sm/12.5 (#20302)
• Parse selectors like [data-foo]div as two selectors instead of one (#20303)
• Ensure @tailwindcss/postcss rebuilds when a preprocessor like Sass changes the input CSS without changing the input file on disk (#20310)
• Ensure CSS nesting is handled even when Lightning CSS isn't run, such as in @tailwindcss/browser and Tailwind Play (#20124)
• Prevent achromatic theme colors from shifting hue when mixed in polar color spaces like oklch (#20314)
• Ensure --spacing(0) is optimized to 0px instead of 0 so it remains a <length> when used in calc(…) (#20319)
• Load @parcel/watcher only when needed in @tailwindcss/cli --watch mode, so one-off builds and --watch --poll work when @parcel/watcher can't be loaded (#20325)
• Use explicit platform fonts instead of system-ui and ui-sans-serif so CJK text respects the page's lang attribute on Windows (#20318)
• Prevent @tailwindcss/upgrade from rewriting ignored files when run from a subdirectory (#20329)
• Ensure earlier @source rules pointing to nested files are scanned when later @source rules point to files in parent folders (#20335)
• Prevent @tailwindcss/vite from triggering full page reloads when scanned files are processed by Vite but haven't been loaded as modules yet (#20336)

4.3.2

Fixed

• Support bare spacing values for auto-rows-* and auto-cols-* utilities (e.g. auto-rows-12 and auto-cols-16) (#20229)
• Prevent @tailwindcss/cli in --watch mode from crashing on Windows when @source points to a directory that doesn't exist (#20242)
• Prevent @tailwindcss/vite from crashing in Deno v2.8.x when context.parentURL is not a valid URL (#20245)
• Ensure @tailwindcss/cli in --watch mode rebuilds when the input CSS file changes in an ignored directory (#20246)
• Allow @variant rules used in addBase(…) to use custom variants defined later (#20247)
• Prevent @tailwindcss/vite from crashing during HMR when scanned files or directories are deleted (#20259)
• Generate font-size instead of color declarations for text-[--spacing(…)] (#20260)
• Prevent @source patterns from scanning unrelated sibling files and folders (#20263)
• Extract class candidates adjacent to Template Toolkit delimiters like %]…[% in .tt, .tt2, and .tx files (#20269)
• Extract class candidates from conditional Maud syntax like p.text-black[condition] (#20269)
• Prevent @position-try rules from triggering unknown at-rule warnings when optimizing CSS (#20277)
• Support class suggestions for named opacity modifiers from --opacity theme values (#20287)
• Prevent type errors in @tailwindcss/postcss when used with newer PostCSS patch releases (#20289)

4.3.1

Added

• Add --silent option to suppress output in @tailwindcss/cli (#20100)

Fixed

• Remove deprecation warnings by using Module#registerHooks instead of Module#register on Node 26+ (#20028)
• Canonicalization: don't crash when plugin utilities throw for unsupported values (#20052)
• Allow @apply to be used with CSS mixins (#19427)
• Ensure not-* correctly negates @container queries, including style(…) queries (#20059)
• Ensure drop-shadow-* color utilities work with custom shadow values containing calc(…) (#20080)
• Fix 'Sourcemap is likely to be incorrect' warnings when using @tailwindcss/vite (#20103)
• Ensure @tailwindcss/webpack can be installed in Rspack projects without requiring webpack as a peer dependency (#20027)
• Canonicalization: don't suggest invalid calc(…) expressions (e.g. px-[calc(1rem+0px)] → px-[calc(1rem+0)]) (#20127)
• Canonicalization: avoid suggesting large spacing-scale values for arbitrary lengths (e.g. left-[99999px] → left-[99999px], not left-24999.75) (#20130)
• Ensure @tailwindcss/cli in --watch mode recovers when a tracked dependency is deleted and restored (#20137)
• Ensure standalone @tailwindcss/cli binaries are ignored when scanning for class candidates (#20139)
• Ensure class candidates are extracted from Twig addClass(…) and removeClass(…) calls (#20198)
• Don't crash in the Ruby or Vue preprocessors when scanning files containing invalid UTF-8 bytes (#19588)
• Allow @variant to be used inside addBase (#19480)
• Ensure @source globs with symlinks are preserved (#20203)
• Ensure later @source rules can re-include files excluded by earlier @source not rules (#20203)
• Upgrade: don't migrate empty class rules to invalid @utility rules (#20205)
• Ensure transitions between inset-shadow-none and other inset shadows work correctly (#20208)
• Ensure explicitly referenced @source directories are scanned even when ignored by git (#20214)
• Ensure @source globs ending in **/* preserve dynamic path segments to avoid scanning too many files (#20217)
• Canonicalization: don't fold calc(…) divisions when the result would require high precision (e.g. w-[calc(100%/3.5)] → w-[calc(100%/3.5)], not w-[28.571428571428573%]) (#20221)
• Serve ESM type declarations to ESM importers of @tailwindcss/postcss (#20228)

Changed

• Generate 0 instead of calc(var(--spacing) * 0) for spacing utilities like m-0 and left-0 (#20196)
• Generate var(--spacing) instead of calc(var(--spacing) * 1) for spacing utilities like m-1 and left-1 (#20196)

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by more commits than we can show here.

🆕 tailwindcss (added, 4.3.4)

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Closed in favor of #137.