# postcss/autoprefixer

Parse CSS and add vendor prefixes to rules by Can I Use

Repository: https://github.com/postcss/autoprefixer
Canonical: https://ross.abutalabs.com/products/autoprefixer
Homepage: https://twitter.com/autoprefixer
Language: JavaScript
License: MIT
License Family: permissive
Topics: css, postcss-plugins, prefixer
Last push: 2026-07-23T11:41:59+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 94, release rhythm 93, longevity 100
- inputs: {"age_days": 4920, "days_push": 41, "days_rel": 48, "gap_med": 25, "n_releases_24m": 12}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 22236, forks 1288 (observed 2026-08-28T04:11:32.493235+00:00)

## What it is
Autoprefixer is a PostCSS plugin that parses CSS and automatically adds vendor prefixes to CSS rules using browser support data from Can I Use. It is widely adopted, recommended by Google, and used in production by companies like Twitter and Alibaba.

## Use cases
- add vendor prefixes to css automatically
- stop writing -webkit- and -moz- prefixes by hand
- process css in webpack or gulp builds with browser prefixes
- support older browsers with css grid prefixes
- remove outdated css prefixes from stylesheets
- integrate css prefixing into a postcss pipeline

## When to choose
- you write modern CSS and want prefixes applied automatically based on browser support data
- you already use PostCSS or a bundler like Webpack or Gulp in your build pipeline
- you need configurable browser targets, e.g. via Browserslist, to control which prefixes are added

## When to avoid
- your build targets only evergreen browsers that no longer require vendor prefixes
- you need CSS polyfills or transpilation of modern syntax to older syntax rather than prefixing
- you are not using a CSS processing pipeline and prefer a pure preprocessor like Sass without PostCSS

## Facets
- artifact type: plugin
- maturity: stable
- function: css-framework, build-tool, developer-tools
- domain: web-development, frontend, web-design, developer-tools
- platform: cross-platform, cli
- tags: postcss-plugin, vendor-prefixes, can-i-use, css-processing, autoprefixer, nodejs

## Member repositories
- postcss/autoprefixer (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:32.493235+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:57:41.291532+00:00, confidence not recorded.
  - readme: https://github.com/postcss/autoprefixer (fetched 2026-08-28T04:11:32.493235+00:00, sha ca78ec1bf105)
- Data as of 2026-08-30T08:39:29.467469+00:00.