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-# postcss-calc [![Build Status](https://travis-ci.org/postcss/postcss-calc.png)](https://travis-ci.org/postcss/postcss-calc)
-
-> [PostCSS](https://github.com/postcss/postcss) plugin to reduce `calc()`.
-
-This plugin reduce `calc()` references whenever it's possible.
-This can be particularly useful with the [postcss-custom-properties](https://github.com/postcss/postcss-custom-properties) plugin.
-
-**Note:** When multiple units are mixed together in the same expression, the `calc()` statement is left as is, to fallback to the [w3c calc() feature](http://www.w3.org/TR/css3-values/#calc).
-
-## Installation
-
-```console
-$ npm install postcss-calc
-```
-
-## Usage
-
-```js
-// dependencies
-var fs = require("fs")
-var postcss = require("postcss")
-var calc = require("postcss-calc")
-
-// css to be processed
-var css = fs.readFileSync("input.css", "utf8")
-
-// process css
-var output = postcss()
-  .use(calc())
-  .process(css)
-  .css
-```
-
-**Example** (with [postcss-custom-properties](https://github.com/postcss/postcss-custom-properties) enabled as well):
-
-```js
-// dependencies
-var fs = require("fs")
-var postcss = require("postcss")
-var customProperties = require("postcss-custom-properties")
-var calc = require("postcss-calc")
-
-// css to be processed
-var css = fs.readFileSync("input.css", "utf8")
-
-// process css
-var output = postcss()
-  .use(customProperties())
-  .use(calc())
-  .process(css)
-  .css
-```
-
-Using this `input.css`:
-
-```css
-:root {
-  --main-font-size: 16px;
-}
-
-body {
-  font-size: var(--main-font-size);
-}
-
-h1 {
-  font-size: calc(var(--main-font-size) * 2);
-  height: calc(100px - 2em);
-  margin-bottom: calc(
-      var(--main-font-size)
-      * 1.5
-    )
-}
-```
-
-you will get:
-
-```css
-body {
-  font-size: 16px
-}
-
-h1 {
-  font-size: 32px;
-  height: calc(100px - 2em);
-  margin-bottom: 24px
-}
-```
-
-Checkout [tests](src/__tests__/index.js) for more examples.
-
-### Options
-
-#### `precision` (default: `5`)
-
-Allow you to define the precision for decimal numbers.
-
-```js
-var out = postcss()
-  .use(calc({precision: 10}))
-  .process(css)
-  .css
-```
-
-#### `preserve` (default: `false`)
-
-Allow you to preserve calc() usage in output so browsers will handle decimal precision themselves.
-
-```js
-var out = postcss()
-  .use(calc({preserve: true}))
-  .process(css)
-  .css
-```
-
-#### `warnWhenCannotResolve` (default: `false`)
-
-Adds warnings when calc() are not reduced to a single value.
-
-```js
-var out = postcss()
-  .use(calc({warnWhenCannotResolve: true}))
-  .process(css)
-  .css
-```
-
-#### `mediaQueries` (default: `false`)
-
-Allows calc() usage as part of media query declarations.
-
-```js
-var out = postcss()
-  .use(calc({mediaQueries: true}))
-  .process(css)
-  .css
-```
-
-#### `selectors` (default: `false`)
-
-Allows calc() usage as part of selectors.
-
-```js
-var out = postcss()
-  .use(calc({selectors: true}))
-  .process(css)
-  .css
-```
-
-Example:
-
-```css
-div[data-size="calc(3*3)"] {
-  width: 100px;
-}
-```
-
----
-
-## Contributing
-
-Work on a branch, install dev-dependencies, respect coding style & run tests before submitting a bug fix or a feature.
-
-```console
-$ git clone https://github.com/postcss/postcss-calc.git
-$ git checkout -b patch-1
-$ npm install
-$ npm test
-```
-
-## [Changelog](CHANGELOG.md)
-
-## [License](LICENSE)