# postcss-discard-overridden

> PostCSS plugin to discard overridden @keyframes or @counter-style.

Latest version **9.0.2** (published 2026-09-05) · MIT license · 0 weekly downloads

## Install

```sh
npm install postcss-discard-overridden
pnpm add postcss-discard-overridden
yarn add postcss-discard-overridden
bun add postcss-discard-overridden
```

## Health

**Score 55/100 (C)** — status: active.

Positive: no vulnerabilities; recently updated; high maintenance score.

Warnings: low downloads; no types; no esm support.

## Facts

| | |
|---|---|
| Version | 9.0.2 |
| Published | 2026-09-05 |
| First published | 2016-04-27 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 0 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 4976 |
| Author | Justineo <justice360@gmail.com> |
| Maintainers | beneb, justineo, ludovicofischer, ai, chriseppstein, andyjansson, evilebottnawi, cssnano-bot |
| Keywords | postcss, css, postcss-plugin, at-rules, @keyframes, @counter-style |

## Links

- npm: https://www.npmjs.com/package/postcss-discard-overridden
- Repository: https://github.com/cssnano/cssnano
- Issues: https://github.com/cssnano/cssnano/issues
- npm.io page: https://npm.io/package/postcss-discard-overridden

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## Recent versions

- 9.0.2 (latest) — 2026-09-05
- 5.0.0-rc.2 (next) — 2021-03-15
- 4.0.0-nightly.2020.2.6 (nightly) — 2021-02-06
- 9.0.1 — 2026-09-01
- 9.0.0 — 2026-08-27
- 8.0.4 — 2026-08-16
- 8.0.3 — 2026-08-09
- 8.0.2 — 2026-08-04
- 8.0.1 — 2026-06-11
- 8.0.0 — 2026-05-06
- 7.0.3 — 2026-05-02
- 7.0.2 — 2026-04-20
- 7.0.1 — 2025-05-06
- 7.0.0 — 2024-04-24
- 6.0.2 — 2024-03-06
- … 32 more at https://npm.io/package/postcss-discard-overridden/versions

## README

# PostCSS Discard Overridden

[PostCSS] plugin to discard overridden `@keyframes` or `@counter-style`.

`@keyframes` or `@counter-style` will be overridden by those who share the same identifiers and appear later in stylesheets. So we can discard all of them except the last one. When defined inside a `@media` or `@supports` rule, `@keyframes` and `@counter-style` rules only override global rules in some of the client browsers so they need handled separately. This plugin has taken care of this and transforms the PostCss AST **safely**.

[PostCSS]: https://github.com/postcss/postcss

```css
@-webkit-keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 0.8;
  }
}
@keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 0.8;
  }
}
@media (max-width: 500px) {
  @-webkit-keyframes fade-in {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 1;
    }
  }
  @keyframes fade-in {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 1;
    }
  }
  @-webkit-keyframes fade-in {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 0.8;
    }
  }
  @keyframes fade-in {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 0.8;
    }
  }
  @supports (display: flex) {
    @-webkit-keyframes fade-in {
      0% {
        opacity: 0;
      }
      100% {
        opacity: 1;
      }
    }
    @keyframes fade-in {
      0% {
        opacity: 0;
      }
      100% {
        opacity: 1;
      }
    }
  }
}
@-webkit-keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
@keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
```

```css
@media (max-width: 500px) {
  @-webkit-keyframes fade-in {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 0.8;
    }
  }
  @keyframes fade-in {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 0.8;
    }
  }
  @supports (display: flex) {
    @-webkit-keyframes fade-in {
      0% {
        opacity: 0;
      }
      100% {
        opacity: 1;
      }
    }
    @keyframes fade-in {
      0% {
        opacity: 0;
      }
      100% {
        opacity: 1;
      }
    }
  }
}
@-webkit-keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
@keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
```

## Usage

See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
examples for your environment.

## Contributors

See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/main/CONTRIBUTORS.md).

---
_Source: https://npm.io/package/postcss-discard-overridden · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._