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- # [postcss][postcss]-discard-duplicates
-
- > Discard duplicate rules in your CSS files with PostCSS.
-
- ## Install
-
- With [npm](https://npmjs.org/package/postcss-discard-duplicates) do:
-
- ```
- npm install postcss-discard-duplicates --save
- ```
-
- ## Example
-
- This module will remove all duplicate rules from your stylesheets. It works on
- at rules, normal rules and declarations. Note that this module does not have any
- responsibility for normalising declarations, selectors or whitespace, so that it
- considers these two rules to be different:
-
- ```css
- h1, h2 {
- color: blue;
- }
-
- h2, h1 {
- color: blue;
- }
- ```
-
- It has to assume that your rules have already been transformed by another
- processor, otherwise it would be responsible for too many things.
-
- ### Input
-
- ```css
- h1 {
- margin: 0 auto;
- margin: 0 auto
- }
-
- h1 {
- margin: 0 auto
- }
- ```
-
- ### Output
-
- ```css
- h1 {
- margin: 0 auto
- }
- ```
-
- ## 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/master/CONTRIBUTORS.md).
-
-
- ## License
-
- MIT © [Ben Briggs](http://beneb.info)
-
-
- [postcss]: https://github.com/postcss/postcss
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