# PostCSS Plugins

PostCSS Tools and Plugins

Repository: https://github.com/csstools/postcss-plugins
Canonical: https://ross.abutalabs.com/products/postcss-plugins
Homepage: https://preset-env.cssdb.org/
Language: CSS
License: MIT-0
License Family: permissive
Topics: postcss, css
Last push: 2026-08-31T19:24:54+00:00
Link (homepage): https://preset-env.cssdb.org/
Link (site_page): https://preset-env.cssdb.org/features

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 100, release rhythm 35, longevity 100
- inputs: {"age_days": 2496, "days_push": 2, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1051, forks 83 (observed 2026-09-01T02:14:00.583440+00:00)

## What it is
PostCSS Preset Env is a PostCSS plugin pack that transpiles modern CSS features (nesting, cascade layers, color functions, custom media, etc.) into CSS that older browsers understand. It determines which polyfills and fallbacks to apply based on your targeted browsers or runtime environments.

## Use cases
- use modern CSS nesting in older browsers
- polyfill CSS color-mix and oklch for legacy browsers
- convert modern CSS syntax to compatible output
- target specific browser support levels with CSS features
- use future CSS specification features today
- add fallbacks for CSS custom media queries
- transpile cascade layers for older browsers

## When to choose
- you want to write modern CSS while supporting older browsers
- you already use PostCSS in your build pipeline
- you need configurable polyfills based on browserslist targets
- you want to adopt upcoming CSS spec features before broad browser support

## When to avoid
- you only target evergreen browsers and need no transpilation
- you use a framework with its own built-in CSS processing like Next.js or Vite defaults
- you need a full CSS framework with components rather than a transpiler
- your build tool does not support PostCSS plugins

## Facets
- artifact type: plugin
- maturity: active
- function: css-framework, compiler, developer-tools
- domain: web-development, frontend, web-design
- platform: cross-platform
- tags: postcss, css-polyfills, css-transpilation, browser-compatibility, css-nesting, css-features, nodejs

## Member repositories
- csstools/postcss-plugins (main) score 77
- csstools/postcss-preset-env (mirror) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-09-01T02:14:00.583440+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 2026-08-30T02:47:15.885394+00:00, confidence not recorded.
  - readme: https://github.com/csstools/postcss-plugins (fetched 2026-09-01T02:14:00.583440+00:00, sha 6a3dcaaffe44)
  - homepage: https://preset-env.cssdb.org/ (fetched 2026-08-29T10:27:37.589026+00:00, sha ab542a001950)
  - site_page: https://preset-env.cssdb.org/features (fetched 2026-08-29T10:27:37.591670+00:00, sha e92a95ad94cc)
- Data as of 2026-08-30T08:39:29.467469+00:00.