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backend/frontend/node_modules/precss/README.md

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+# PreCSS [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS Logo" width="90" height="90" align="right">][postcss]
+
+[![NPM Version][npm-img]][npm-url]
+[![Build Status][cli-img]][cli-url]
+[![Support Chat][git-img]][git-url]
+
+[PreCSS] lets you use Sass-like markup and staged CSS features in CSS.
+
+```scss
+$blue: #056ef0;
+$column: 200px;
+
+.menu {
+  width: calc(4 * $column);
+}
+
+.menu_link {
+  background: $blue;
+  width: $column;
+}
+
+/* becomes */
+
+.menu {
+  width: calc(4 * 200px);
+}
+
+.menu_link {
+  background: #056ef0;
+  width: 200px;
+}
+```
+
+PreCSS combines Sass-like syntactical sugar — like variables, conditionals, and
+iterators — with emerging CSS features — like logical and custom properties,
+media query ranges, and image sets.
+
+## Usage
+
+Add [PreCSS] to your build tool:
+
+```bash
+npm install precss --save-dev
+```
+
+#### Node
+
+Use [PreCSS] to process your CSS:
+
+```js
+import precss from 'precss';
+
+precss.process(YOUR_CSS);
+```
+
+#### PostCSS
+
+Add [PostCSS] to your build tool:
+
+```bash
+npm install postcss --save-dev
+```
+
+Use [PreCSS] as a plugin:
+
+```js
+import postcss from 'postcss';
+import precss from 'precss';
+
+postcss([
+  precss(/* options */)
+]).process(YOUR_CSS);
+```
+
+#### Gulp
+
+Add [Gulp PostCSS] to your build tool:
+
+```bash
+npm install gulp-postcss --save-dev
+```
+
+Use [PreCSS] in your Gulpfile:
+
+```js
+import postcss from 'gulp-postcss';
+import precss from 'precss';
+
+gulp.task('css', function () {
+  return gulp.src('./src/*.css').pipe(
+    postcss([
+      precss(/* options */)
+    ])
+  ).pipe(
+    gulp.dest('.')
+  );
+});
+```
+
+#### Grunt
+
+Add [Grunt PostCSS] to your build tool:
+
+```bash
+npm install grunt-postcss --save-dev
+```
+
+Use [PreCSS] in your Gruntfile:
+
+```js
+import precss from 'precss';
+
+grunt.loadNpmTasks('grunt-postcss');
+
+grunt.initConfig({
+  postcss: {
+    options: {
+      use: [
+        precss(/* options */)
+      ]
+    },
+    dist: {
+      src: '*.css'
+    }
+  }
+});
+```
+
+# Plugins
+
+PreCSS is powered by the following plugins (in this order):
+
+- [postcss-extend-rule](https://github.com/jonathantneal/postcss-extend-rule)
+- [postcss-advanced-variables](https://github.com/jonathantneal/postcss-advanced-variables)
+- [postcss-preset-env](https://github.com/jonathantneal/postcss-preset-env)
+- [postcss-atroot](https://github.com/OEvgeny/postcss-atroot)
+- [postcss-property-lookup](https://github.com/simonsmith/postcss-property-lookup)
+- [postcss-nested](https://github.com/postcss/postcss-nested)
+
+[cli-img]: https://img.shields.io/travis/jonathantneal/precss/master.svg
+[cli-url]: https://travis-ci.org/jonathantneal/precss
+[git-img]: https://img.shields.io/badge/chat-gitter-blue.svg
+[git-url]: https://gitter.im/postcss/postcss
+[npm-img]: https://img.shields.io/npm/v/precss.svg
+[npm-url]: https://www.npmjs.com/package/precss
+
+[Gulp PostCSS]: https://github.com/postcss/gulp-postcss
+[Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss
+[PostCSS]: https://github.com/postcss/postcss
+[PreCSS]: https://github.com/jonathantneal/precss