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npm · #1986 most downloaded on npm
Minify selectors with PostCSS.
Last release 2 days ago
02 Oct 2026
Ships unpredictably
gaps range from 8 days to 10 months
Most releases are documented
notes for 49 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
12 years old
85 releases · first in 2015
Stop turning a comment inside a selector into a descendant combinator. A comment is not whitespace, so .a//.b selects elements with both classes, incl
Stop turning a comment inside a selector into a descendant combinator. A comment is not whitespace, so .a/**/.b selects elements with both classes, including inside :is(), and is no longer rewritten as .a .b. Invalid selectors such as div/**/span are left as written instead of becoming valid.
Leave rules with an invalid selector unchanged, including an ID selector that starts with a digit, such as #1a, and a combinator after a pseudo-element, such as a::before b.
Require Browserslist 4.29.3 or later.
fix(postcss-svgo): decode SVG following WHATWG specification in #1975
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.4...cssnano@9.0.5
One column per quarter.
Preserve malformed attribute selectors instead of minifying them into selectors that can match a different set of elements.
Folds more selector lists into safe :is() expressions when their selectors contain nested comma-separated functions, while preserving selector order and conservative specificity and namespace checks.
Adds the balanced token index used by selector, parameter, and gradient minification while preserving their serialized CSS output.
perf: median 15% speed increase on test fixtures
Use ASCII case-insensitive matching for CSS names and grammar keywords so Unicode lookalikes are preserved, and restrict CSS whitespace normalization to the CSS whitespace set.
Preserves invalid selector syntax and namespace-sensitive universal selectors while safely normalizing pseudo-element, View Transition, and keyframe forms. Recognizes the full token grammar for An+B formulas, including escaped forms and exact large integers.
update browserslist
Updated dependencies:
fix: update postcss-calc in #1970
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.3...cssnano@9.0.4
fix: update color parsing library in #1964
fix: update color parsing library in #1964
fix: update PostCSS and selector parser
fix: update conflict detection and color conversion CSS spec conformance
fix: update PostCSS peer dependency
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.2...cssnano@9.0.3
fix: update postcss and selector parser
fix: update PostCSS peer dependency
fix: add main and types to package manifests in #1958
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.1...cssnano@9.0.2
refactor: some small performance gains in #1955
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@9.0.0...cssnano@9.0.1
Migrate to ESM and simplify config loading in #1948
Probably backward-compatible for most users. Some changes to configuration loading documented in migration guide.
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.10...cssnano@9.0.0
^22.22.3 || ^24.15.0 || >=26.0. Package subpath imports are no longer supported. See the migration documentation before upgrading.fix(postcss-merge-longhand): fix issues with border merging in #1886
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.4...cssnano@8.0.5
fix(postcss-minify-selectors): preserve namespaced universal selector
fix: ensure packages reach registry with correct repository field
Fix postcs-svgo encoding in #1877
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.3...cssnano@8.0.4
postcss-reduce-initial: update initial properties
packages now define an exports field in package.json. This prevents any file added to the package to automatically be exposed as a possible import. The has been done in a backward compatible way, so you should be able to import every file you did in the previous release.
types have also been regenerated with TypeScript 7.
Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.2...cssnano@8.0.3
chore: regenerate all type definitions with TypeScript 7
fix: update svgo, autoprefixer and postcss
feat: make some packages runnable on the web without extra polyfills
fix: update PostCSS
chore: define package.json exports
chore: update dependencies
Update autoprefixer, browserslist, colordx and postcss
chore: update the postcss peer dependency
fix(postcss-minify-selectors): avoid folding some selectors incorrectly
ea8e33a: chore: drop Node.js 20 support
ea8e33a: chore: drop Node.js 20 support
Node.js 20 has reached end of life.
fix(postcss-minify-selectors): do not fold non-standard selectors
0005443: fix(postcss-minify-selectors): fix wrong behaviour when merging into is()
6d5b6cc: feat(postcss-minify-selectors): fold selector lists into :is()
c3e537a: fix: update postcss-selector-parser
5672148: fix: update PostCSS peer dependency to version without vulnerabilities
1d65a10: fix: update postcss-selector-parser
dff5c42: chore: update browserslist and postcss-selector-parser
9e8606a: fix: solve some invalid output when minifying selectors
c14b9f5: chore: update postcss-selector-parser
0d10597: chore: drop support for Node.js 14 and 16
0856f86: chore: update postcss-selector-parser
enable “go to definition” via declaration maps
f233b22: chore: update-postcss-selector-parser to 6.0.14
18331a6: fix: update cssnano peer dependency to 8.4.31 to avoid security issue
ca9d3f55: Switch minimum supported Node version to 14 for all packages
fix: preserve similar nested selectors
feature: add TypeScript type declarations
Publish untranspiled CommonJS source
refactor: remove implicit boolean conversion
postcss-minify-selectors: upgrade postcss-selector-parser
Note: Version bump only for package postcss-minify-selectors
Note: Version bump only for package postcss-minify-selectors
Note: Version bump only for package postcss-minify-selectors
postcss version is 8.2.1Nothing published for this version
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postcss-merge-longhand don't explode declarations with custom properties.
postcss-merge-longhand don't explode declarations with custom properties.postcss-colormin now better transform to hsl.browserslist version incompatibility with caniuse-api
browserslist version incompatibility with caniuse-apiWe dropped support for Node 4, now requiring at least Node 6.9.
border-spacing property.U to lowercase for IE <= 11 and Edge <= 15.a { border-style:dotted; border-style:var(--variable) }) correctly.border property with invalid border width value correctly.:-ms-input-placeholder and ::-ms-input-placeholder selectors correctly.all property correctly.url function.data and *-extension:// URLs correctly.all for IE.Includes the new release candidate for postcss-selector-parser 3.
@media \0screen\,screen\9 {} hacks
(thanks to @evilebottnawi).resolveConfig for a Root node without a source property
(thanks to @darthmaim).Since version 4 has been in-development for some time, we thought it would be best to release an alpha version so that we could catch any issues befor
Since version 4 has been in-development for some time, we thought it would be best to release an alpha version so that we could catch any issues before the actual release.
cssnano & its plugins have been upgraded to PostCSS 6.x. Please ensure that for optimal results that you use cssnano with a PostCSS 6 compatible runner & that any other plugins are also using PostCSS 6.
cssnano is now essentially a preset loader and does not contain any built-in
transforms (instead, it delegates to cssnano-preset-default by default).
Due to the new architecture, it's not possible to exclude asynchronous
transforms and run it synchronously, unlike in 3.x. Any transforms that
were "core" modules have now been extracted out into separate packages.
Because of the new preset system, cssnano will not accept any transformation options; these must be set in the preset. The option names remain mostly the same, except some cases where "core" modules have been extracted out:
core is now normalizeWhitespace.reduceBackgroundRepeat is now normalizeRepeatStyle.reduceDisplayValues is now normalizeDisplayValues.reducePositions is now normalizePositions.reduceTimingFunctions is now normalizeTimingFunctions.styleCache is now rawCache.When excluding transforms, we now have an exclude option (in 3.x this was
named disable). Similarly, the safe option was removed; the defaults
are now much less aggressive.
By default, the following transforms are no longer applied to any input CSS. You may see an increased output file size as a result:
autoprefixerpostcss-discard-unusedpostcss-merge-identspostcss-reduce-identspostcss-zindexNote that you can load cssnano-preset-advanced instead which does contain
these transforms.
We no longer detect previous plugins to silently exclude our own, and now
consider this to be an anti-pattern. So postcss-filter-plugins was removed.
We also changed some options to make the default transforms safer:
postcss-minify-font-values: removeAfterKeyword set to false from true.postcss-normalize-url: stripWWW set to false from true.cssnano now does not accept the sourcemap shortcut option; please refer
to the PostCSS documentation on sourcemaps. The quickstart.js file included
with this module will give you a good starting point.
cssnano.process is no longer a custom method; we use the built-in process
method exposed on each PostCSS plugin. The new signature is
cssnano.process(css, postcssOpts, cssnanoOpts), in 3.x it was
cssnano.process(css, cssnanoOpts).
We dropped support for Node 0.12, now requiring at least Node 4.
Finally, cssnano is now developed as a monorepo, due to the fact that some
transforms have a lot of grey area/overlap. Due to this, some modules have
been refactored to delegate responsibility to others, such that duplication
of functionality is minimized. For instance, postcss-colormin will no
longer compress whitespace or compress numbers, as those are handled by
postcss-normalize-whitespace & postcss-convert-values respectively.
clone behaviour. In cases where some utility
has been used by several plugins it is now a separate package, reducing
cssnano's footprint.postcss-colormin &
postcss-reduce-initial were enhanced with different behaviour depending
on which browsers are passed. And now, the footprint for the caniuse-db
dependency is much smaller thanks to caniuse-lite - 7 times smaller as
of this writing. This makes cssnano much faster to download from npm!Nothing published for this version
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