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+<h1 align="center">
+  <br/>
+  <img src="https://cdn.rawgit.com/jakubpawlowicz/clean-css/master/logo.v2.svg" alt="clean-css logo" width="525px"/>
+  <br/>
+  <br/>
+</h1>
+
+[![NPM version](https://img.shields.io/npm/v/clean-css.svg?style=flat)](https://www.npmjs.com/package/clean-css)
+[![Linux Build Status](https://img.shields.io/travis/jakubpawlowicz/clean-css/master.svg?style=flat&label=Linux%20build)](https://travis-ci.org/jakubpawlowicz/clean-css)
+[![Windows Build status](https://img.shields.io/appveyor/ci/jakubpawlowicz/clean-css/master.svg?style=flat&label=Windows%20build)](https://ci.appveyor.com/project/jakubpawlowicz/clean-css/branch/master)
+[![Dependency Status](https://img.shields.io/david/jakubpawlowicz/clean-css.svg?style=flat)](https://david-dm.org/jakubpawlowicz/clean-css)
+[![NPM Downloads](https://img.shields.io/npm/dm/clean-css.svg)](https://www.npmjs.com/package/clean-css)
+[![Twitter](https://img.shields.io/badge/Twitter-@cleancss-blue.svg)](https://twitter.com/cleancss)
+
+clean-css is a fast and efficient CSS optimizer for [Node.js](http://nodejs.org/) platform and [any modern browser](https://jakubpawlowicz.github.io/clean-css).
+
+According to [tests](http://goalsmashers.github.io/css-minification-benchmark/) it is one of the best available.
+
+**Table of Contents**
+
+- [Node.js version support](#nodejs-version-support)
+- [Install](#install)
+- [Use](#use)
+  * [Important: 4.0 breaking changes](#important-40-breaking-changes)
+  * [Constructor options](#constructor-options)
+  * [Compatibility modes](#compatibility-modes)
+  * [Formatting options](#formatting-options)
+  * [Inlining options](#inlining-options)
+  * [Optimization levels](#optimization-levels)
+    + [Level 0 optimizations](#level-0-optimizations)
+    + [Level 1 optimizations](#level-1-optimizations)
+    + [Level 2 optimizations](#level-2-optimizations)
+  * [Minify method](#minify-method)
+  * [Promise interface](#promise-interface)
+- [FAQ](#faq)
+  * [How to optimize multiple files?](#how-to-optimize-multiple-files)
+  * [How to process remote `@import`s correctly?](#how-to-process-remote-imports-correctly)
+  * [How to apply arbitrary transformations to CSS properties?](#how-to-apply-arbitrary-transformations-to-css-properties)
+  * [How to specify a custom rounding precision?](#how-to-specify-a-custom-rounding-precision)
+  * [How to preserve a comment block?](#how-to-preserve-a-comment-block)
+  * [How to rebase relative image URLs?](#how-to-rebase-relative-image-urls)
+  * [How to work with source maps?](#how-to-work-with-source-maps)
+  * [How to apply level 1 & 2 optimizations at the same time?](#how-to-apply-level-1--2-optimizations-at-the-same-time)
+  * [What level 2 optimizations do?](#what-level-2-optimizations-do)
+  * [How to use clean-css with build tools?](#how-to-use-clean-css-with-build-tools)
+  * [How to use clean-css from web browser?](#how-to-use-clean-css-from-web-browser)
+- [Contributing](#contributing)
+  * [How to get started?](#how-to-get-started)
+- [Acknowledgments](#acknowledgments)
+- [License](#license)
+
+# Node.js version support
+
+clean-css requires Node.js 4.0+ (tested on Linux, OS X, and Windows)
+
+# Install
+
+```
+npm install clean-css
+```
+
+# Use
+
+```js
+var CleanCSS = require('clean-css');
+var input = 'a{font-weight:bold;}';
+var options = { /* options */ };
+var output = new CleanCSS(options).minify(input);
+```
+
+## Important: 4.0 breaking changes
+
+clean-css 4.0 introduces some breaking changes:
+
+* API and CLI interfaces are split, so API stays in this repository while CLI moves to [clean-css-cli](https://github.com/jakubpawlowicz/clean-css-cli);
+* `root`, `relativeTo`, and `target` options are replaced by a single `rebaseTo` option - this means that rebasing URLs and import inlining is much simpler but may not be (YMMV) as powerful as in 3.x;
+* `debug` option is gone as stats are always provided in output object under `stats` property;
+* `roundingPrecision` is disabled by default;
+* `roundingPrecision` applies to **all** units now, not only `px` as in 3.x;
+* `processImport` and `processImportFrom` are merged into `inline` option which defaults to `local`. Remote `@import` rules are **NOT** inlined by default anymore;
+* splits `inliner: { request: ..., timeout: ... }` option into `inlineRequest` and `inlineTimeout` options;
+* remote resources without a protocol, e.g. `//fonts.googleapis.com/css?family=Domine:700`, are not inlined anymore;
+* changes default Internet Explorer compatibility from 9+ to 10+, to revert the old default use `{ compatibility: 'ie9' }` flag;
+* renames `keepSpecialComments` to `specialComments`;
+* moves `roundingPrecision` and `specialComments` to level 1 optimizations options, see examples;
+* moves `mediaMerging`, `restructuring`, `semanticMerging`, and `shorthandCompacting` to level 2 optimizations options, see examples below;
+* renames `shorthandCompacting` option to `mergeIntoShorthands`;
+* level 1 optimizations are the new default, up to 3.x it was level 2;
+* `keepBreaks` option is replaced with `{ format: 'keep-breaks' }` to ease transition;
+* `sourceMap` option has to be a boolean from now on - to specify an input source map pass it a 2nd argument to `minify` method or via a hash instead;
+* `aggressiveMerging` option is removed as aggressive merging is replaced by smarter override merging.
+
+## Constructor options
+
+clean-css constructor accepts a hash as a parameter with the following options available:
+
+* `compatibility` - controls compatibility mode used; defaults to `ie10+`; see [compatibility modes](#compatibility-modes) for examples;
+* `format` - controls output CSS formatting; defaults to `false`; see [formatting options](#formatting-options) for examples;
+* `inline` - controls `@import` inlining rules; defaults to `'local'`; see [inlining options](#inlining-options) for examples;
+* `inlineRequest` - controls extra options for inlining remote `@import` rules, can be any of [HTTP(S) request options](https://nodejs.org/api/http.html#http_http_request_options_callback);
+* `inlineTimeout` - controls number of milliseconds after which inlining a remote `@import` fails; defaults to 5000;
+* `level` - controls optimization level used; defaults to `1`; see [optimization levels](#optimization-levels) for examples;
+* `rebase` - controls URL rebasing; defaults to `true`;
+* `rebaseTo` - controls a directory to which all URLs are rebased, most likely the directory under which the output file will live; defaults to the current directory;
+* `returnPromise` - controls whether `minify` method returns a Promise object or not; defaults to `false`; see [promise interface](#promise-interface) for examples;
+* `sourceMap` - controls whether an output source map is built; defaults to `false`;
+* `sourceMapInlineSources` - controls embedding sources inside a source map's `sourcesContent` field; defaults to false.
+
+## Compatibility modes
+
+There is a certain number of compatibility mode shortcuts, namely:
+
+* `new CleanCSS({ compatibility: '*' })` (default) - Internet Explorer 10+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie9' })` - Internet Explorer 9+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie8' })` - Internet Explorer 8+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie7' })` - Internet Explorer 7+ compatibility mode
+
+Each of these modes is an alias to a [fine grained configuration](https://github.com/jakubpawlowicz/clean-css/blob/master/lib/options/compatibility.js), with the following options available:
+
+```js
+new CleanCSS({
+  compatibility: {
+    colors: {
+      opacity: true // controls `rgba()` / `hsla()` color support
+    },
+    properties: {
+      backgroundClipMerging: true, // controls background-clip merging into shorthand
+      backgroundOriginMerging: true, // controls background-origin merging into shorthand
+      backgroundSizeMerging: true, // controls background-size merging into shorthand
+      colors: true, // controls color optimizations
+      ieBangHack: false, // controls keeping IE bang hack
+      ieFilters: false, // controls keeping IE `filter` / `-ms-filter`
+      iePrefixHack: false, // controls keeping IE prefix hack
+      ieSuffixHack: false, // controls keeping IE suffix hack
+      merging: true, // controls property merging based on understandability
+      shorterLengthUnits: false, // controls shortening pixel units into `pc`, `pt`, or `in` units
+      spaceAfterClosingBrace: true, // controls keeping space after closing brace - `url() no-repeat` into `url()no-repeat`
+      urlQuotes: false, // controls keeping quoting inside `url()`
+      zeroUnits: true // controls removal of units `0` value
+    },
+    selectors: {
+      adjacentSpace: false, // controls extra space before `nav` element
+      ie7Hack: true, // controls removal of IE7 selector hacks, e.g. `*+html...`
+      mergeablePseudoClasses: [':active', ...], // controls a whitelist of mergeable pseudo classes
+      mergeablePseudoElements: ['::after', ...] // controls a whitelist of mergeable pseudo elements
+    },
+    units: {
+      ch: true, // controls treating `ch` as a supported unit
+      in: true, // controls treating `in` as a supported unit
+      pc: true, // controls treating `pc` as a supported unit
+      pt: true, // controls treating `pt` as a supported unit
+      rem: true, // controls treating `rem` as a supported unit
+      vh: true, // controls treating `vh` as a supported unit
+      vm: true, // controls treating `vm` as a supported unit
+      vmax: true, // controls treating `vmax` as a supported unit
+      vmin: true // controls treating `vmin` as a supported unit
+    }
+  }
+})
+```
+
+You can also use a string when setting a compatibility mode, e.g.
+
+```js
+new CleanCSS({
+  compatibility: 'ie9,-properties.merging' // sets compatibility to IE9 mode with disabled property merging
+})
+```
+
+## Formatting options
+
+The `format` option accept the following options:
+
+```js
+new CleanCSS({
+  format: {
+    breaks: { // controls where to insert breaks
+      afterAtRule: false, // controls if a line break comes after an at-rule; e.g. `@charset`; defaults to `false`
+      afterBlockBegins: false, // controls if a line break comes after a block begins; e.g. `@media`; defaults to `false`
+      afterBlockEnds: false, // controls if a line break comes after a block ends, defaults to `false`
+      afterComment: false, // controls if a line break comes after a comment; defaults to `false`
+      afterProperty: false, // controls if a line break comes after a property; defaults to `false`
+      afterRuleBegins: false, // controls if a line break comes after a rule begins; defaults to `false`
+      afterRuleEnds: false, // controls if a line break comes after a rule ends; defaults to `false`
+      beforeBlockEnds: false, // controls if a line break comes before a block ends; defaults to `false`
+      betweenSelectors: false // controls if a line break comes between selectors; defaults to `false`
+    },
+    indentBy: 0, // controls number of characters to indent with; defaults to `0`
+    indentWith: 'space', // controls a character to indent with, can be `'space'` or `'tab'`; defaults to `'space'`
+    spaces: { // controls where to insert spaces
+      aroundSelectorRelation: false, // controls if spaces come around selector relations; e.g. `div > a`; defaults to `false`
+      beforeBlockBegins: false, // controls if a space comes before a block begins; e.g. `.block {`; defaults to `false`
+      beforeValue: false // controls if a space comes before a value; e.g. `width: 1rem`; defaults to `false`
+    },
+    wrapAt: false // controls maximum line length; defaults to `false`
+  }
+})
+```
+
+## Inlining options
+
+`inline` option whitelists which `@import` rules will be processed, e.g.
+
+```js
+new CleanCSS({
+  inline: ['local'] // default
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['all'] // same as ['local', 'remote']
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['local', 'mydomain.example.com']
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['local', 'remote', '!fonts.googleapis.com']
+})
+```
+
+## Optimization levels
+
+The `level` option can be either `0`, `1` (default), or `2`, e.g.
+
+```js
+new CleanCSS({
+  level: 2
+})
+```
+
+or a fine-grained configuration given via a hash.
+
+Please note that level 1 optimization options are generally safe while level 2 optimizations should be safe for most users.
+
+### Level 0 optimizations
+
+Level 0 optimizations simply means "no optimizations". Use it when you'd like to inline imports and / or rebase URLs but skip everything else.
+
+### Level 1 optimizations
+
+Level 1 optimizations (default) operate on single properties only, e.g. can remove units when not required, turn rgb colors to a shorter hex representation, remove comments, etc
+
+Here is a full list of available options:
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      cleanupCharsets: true, // controls `@charset` moving to the front of a stylesheet; defaults to `true`
+      normalizeUrls: true, // controls URL normalization; defaults to `true`
+      optimizeBackground: true, // controls `background` property optimizatons; defaults to `true`
+      optimizeBorderRadius: true, // controls `border-radius` property optimizatons; defaults to `true`
+      optimizeFilter: true, // controls `filter` property optimizatons; defaults to `true`
+      optimizeFont: true, // ontrols `font` property optimizatons; defaults to `true`
+      optimizeFontWeight: true, // controls `font-weight` property optimizatons; defaults to `true`
+      optimizeOutline: true, // controls `outline` property optimizatons; defaults to `true`
+      removeNegativePaddings: true, // controls removing negative paddings; defaults to `true`
+      removeQuotes: true, // controls removing quotes when unnecessary; defaults to `true`
+      removeWhitespace: true, // controls removing unused whitespace; defaults to `true`
+      replaceMultipleZeros: true, // contols removing redundant zeros; defaults to `true`
+      replaceTimeUnits: true, // controls replacing time units with shorter values; defaults to `true`
+      replaceZeroUnits: true, // controls replacing zero values with units; defaults to `true`
+      roundingPrecision: false, // rounds pixel values to `N` decimal places; `false` disables rounding; defaults to `false`
+      selectorsSortingMethod: 'standard', // denotes selector sorting method; can be `natural` or `standard`; defaults to `standard`
+      specialComments: 'all', // denotes a number of /*! ... */ comments preserved; defaults to `all`
+      tidyAtRules: true, // controls at-rules (e.g. `@charset`, `@import`) optimizing; defaults to `true`
+      tidyBlockScopes: true, // controls block scopes (e.g. `@media`) optimizing; defaults to `true`
+      tidySelectors: true, // controls selectors optimizing; defaults to `true`,
+      transform: function () {} // defines a callback for fine-grained property optimization; defaults to no-op
+    }
+  }
+});
+```
+
+There is an `all` shortcut for toggling all options at the same time, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      all: false, // set all values to `false`
+      tidySelectors: true // turns on optimizing selectors
+    }
+  }
+});
+```
+
+### Level 2 optimizations
+
+Level 2 optimizations operate at rules or multiple properties level, e.g. can remove duplicate rules, remove properties redefined further down a stylesheet, or restructure rules by moving them around.
+
+Please note that if level 2 optimizations are turned on then, unless explicitely disabled, level 1 optimizations are applied as well.
+
+Here is a full list of available options:
+
+```js
+new CleanCSS({
+  level: {
+    2: {
+      mergeAdjacentRules: true, // controls adjacent rules merging; defaults to true
+      mergeIntoShorthands: true, // controls merging properties into shorthands; defaults to true
+      mergeMedia: true, // controls `@media` merging; defaults to true
+      mergeNonAdjacentRules: true, // controls non-adjacent rule merging; defaults to true
+      mergeSemantically: false, // controls semantic merging; defaults to false
+      overrideProperties: true, // controls property overriding based on understandability; defaults to true
+      reduceNonAdjacentRules: true, // controls non-adjacent rule reducing; defaults to true
+      removeDuplicateFontRules: true, // controls duplicate `@font-face` removing; defaults to true
+      removeDuplicateMediaBlocks: true, // controls duplicate `@media` removing; defaults to true
+      removeDuplicateRules: true, // controls duplicate rules removing; defaults to true
+      restructureRules: false // controls rule restructuring; defaults to false
+    }
+  }
+});
+```
+
+There is an `all` shortcut for toggling all options at the same time, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    2: {
+      all: false, // sets all values to `false`
+      removeDuplicateRules: true // turns on removing duplicate rules
+    }
+  }
+});
+```
+
+## Minify method
+
+Once configured clean-css provides a `minify` method to optimize a given CSS, e.g.
+
+```js
+var output = new CleanCSS(options).minify(source);
+```
+
+The output of the `minify` method is a hash with following fields:
+
+```js
+console.log(output.styles); // optimized output CSS as a string
+console.log(output.sourceMap); // output source map if requested with `sourceMap` option
+console.log(output.errors); // a list of errors raised
+console.log(output.warnings); // a list of warnings raised
+console.log(output.stats.originalSize); // original content size after import inlining
+console.log(output.stats.minifiedSize); // optimized content size
+console.log(output.stats.timeSpent); // time spent on optimizations in milliseconds
+console.log(output.stats.efficiency); // a ratio of output size to input size (e.g. 25% if content was reduced from 100 bytes to 75 bytes)
+```
+
+The `minify` method also accepts an input source map, e.g.
+
+```js
+var output = new CleanCSS(options).minify(source, inputSourceMap);
+```
+
+or a callback invoked when optimizations are finished, e.g.
+
+```js
+new CleanCSS(options).minify(source, function (error, output) {
+  // `output` is the same as in the synchronous call above
+});
+```
+
+## Promise interface
+
+If you prefer clean-css to return a Promise object then you need to explicitely ask for it, e.g.
+
+```js
+new CleanCSS({ returnPromise: true })
+  .minify(source)
+  .then(function (output) { console.log(output.styles); })
+  .catch(function (error) { // deal with errors });
+```
+
+# FAQ
+
+## How to optimize multiple files?
+
+It can be done either by passing an array of paths, or, when sources are already available, a hash:
+
+```js
+new CleanCSS().minify(['path/to/file/one', 'path/to/file/two']);
+```
+
+```js
+new CleanCSS().minify({
+  'path/to/file/one': {
+    styles: 'contents of file one'
+  },
+  'path/to/file/two': {
+    styles: 'contents of file two'
+  }
+});
+```
+
+Important note - any `@import` rules already present in the hash will be resolved in memory.
+
+## How to process remote `@import`s correctly?
+
+In order to inline remote `@import` statements you need to provide a callback to minify method as fetching remote assets is an asynchronous operation, e.g.:
+
+```js
+var source = '@import url(http://example.com/path/to/remote/styles);';
+new CleanCSS({ inline: ['remote'] }).minify(source, function (error, output) {
+  // output.styles
+});
+```
+
+If you don't provide a callback, then remote `@import`s will be left as is.
+
+## How to apply arbitrary transformations to CSS properties?
+
+If clean-css doesn't perform a particular property optimization, you can use `transform` callback to apply it:
+
+```js
+var source = '.block{background-image:url(/path/to/image.png)}';
+var output = new CleanCSS({
+  level: {
+    1: {
+      transform: function (propertyName, propertyValue) {
+        if (propertyName == 'background-image' && propertyValue.indexOf('/path/to') > -1) {
+          return propertyValue.replace('/path/to', '../valid/path/to');
+        }
+      }
+    }
+  }
+}).minify(source);
+
+console.log(output.styles); # => .block{background-image:url(../valid/path/to/image.png)}
+```
+
+Note: returning `false` from `transform` callback will drop a property.
+
+## How to specify a custom rounding precision?
+
+The level 1 `roundingPrecision` optimization option accept a string with per-unit rounding precision settings, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      roundingPrecision: 'all=3,px=5'
+    }
+  }
+}).minify(source)
+```
+
+which sets all units rounding precision to 3 digits except `px` unit precision of 5 digits.
+
+## How to preserve a comment block?
+
+Use the `/*!` notation instead of the standard one `/*`:
+
+```css
+/*!
+  Important comments included in optimized output.
+*/
+```
+
+## How to rebase relative image URLs?
+
+clean-css will handle it automatically for you in the following cases:
+
+* when full paths to input files are passed in as options;
+* when correct paths are passed in via a hash;
+* when `rebaseTo` is used with any of above two.
+
+## How to work with source maps?
+
+To generate a source map, use `sourceMap: true` option, e.g.:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory })
+  .minify(source, function (error, output) {
+    // access output.sourceMap for SourceMapGenerator object
+    // see https://github.com/mozilla/source-map/#sourcemapgenerator for more details
+});
+```
+
+You can also pass an input source map directly as a 2nd argument to `minify` method:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory })
+  .minify(source, inputSourceMap, function (error, output) {
+    // access output.sourceMap to access SourceMapGenerator object
+    // see https://github.com/mozilla/source-map/#sourcemapgenerator for more details
+});
+```
+
+or even multiple input source maps at once:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory }).minify({
+  'path/to/source/1': {
+    styles: '...styles...',
+    sourceMap: '...source-map...'
+  },
+  'path/to/source/2': {
+    styles: '...styles...',
+    sourceMap: '...source-map...'
+  }
+}, function (error, output) {
+  // access output.sourceMap as above
+});
+```
+
+## How to apply level 1 & 2 optimizations at the same time?
+
+Using the hash configuration specifying both optimization levels, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      all: true,
+      normalizeUrls: false
+    },
+    2: {
+      restructureRules: true
+    }
+  }
+})
+```
+
+will apply level 1 optimizations, except url normalization, and default level 2 optimizations with rule restructuring.
+
+## What level 2 optimizations do?
+
+All level 2 optimizations are dispatched [here](https://github.com/jakubpawlowicz/clean-css/blob/master/lib/optimizer/level-2/optimize.js#L67), and this is what they do:
+
+* `recursivelyOptimizeBlocks` - does all the following operations on a nested block, like `@media` or `@keyframe`;
+* `recursivelyOptimizeProperties` - optimizes properties in rulesets and flat at-rules, like @font-face, by splitting them into components (e.g. `margin` into `margin-(bottom|left|right|top)`), optimizing, and restoring them back. You may want to use `mergeIntoShorthands` option to control whether you want to turn multiple components into shorthands;
+* `removeDuplicates` - gets rid of duplicate rulesets with exactly the same set of properties, e.g. when including a Sass / Less partial twice for no good reason;
+* `mergeAdjacent` - merges adjacent rulesets with the same selector or rules;
+* `reduceNonAdjacent` - identifies which properties are overridden in same-selector non-adjacent rulesets, and removes them;
+* `mergeNonAdjacentBySelector` - identifies same-selector non-adjacent rulesets which can be moved (!) to be merged, requires all intermediate rulesets to not redefine the moved properties, or if redefined to have the same value;
+* `mergeNonAdjacentByBody` - same as the one above but for same-selector non-adjacent rulesets;
+* `restructure` - tries to reorganize different-selector different-rules rulesets so they take less space, e.g. `.one{padding:0}.two{margin:0}.one{margin-bottom:3px}` into `.two{margin:0}.one{padding:0;margin-bottom:3px}`;
+* `removeDuplicateFontAtRules` - removes duplicated `@font-face` rules;
+* `removeDuplicateMediaQueries` - removes duplicated `@media` nested blocks;
+* `mergeMediaQueries` - merges non-adjacent `@media` at-rules by the same rules as `mergeNonAdjacentBy*` above;
+
+## How to use clean-css with build tools?
+
+There is a number of 3rd party plugins to popular build tools:
+
+* [Broccoli](https://github.com/broccolijs/broccoli#broccoli): [broccoli-clean-css](https://github.com/shinnn/broccoli-clean-css)
+* [Brunch](http://brunch.io/): [clean-css-brunch](https://github.com/brunch/clean-css-brunch)
+* [Grunt](http://gruntjs.com): [grunt-contrib-cssmin](https://github.com/gruntjs/grunt-contrib-cssmin)
+* [Gulp](http://gulpjs.com/): [gulp-clean-css](https://github.com/scniro/gulp-clean-css)
+* [Gulp](http://gulpjs.com/): [using vinyl-map as a wrapper - courtesy of @sogko](https://github.com/jakubpawlowicz/clean-css/issues/342)
+* [component-builder2](https://github.com/component/builder2.js): [builder-clean-css](https://github.com/poying/builder-clean-css)
+* [Metalsmith](http://metalsmith.io): [metalsmith-clean-css](https://github.com/aymericbeaumet/metalsmith-clean-css)
+* [Lasso](https://github.com/lasso-js/lasso): [lasso-clean-css](https://github.com/yomed/lasso-clean-css)
+* [Start](https://github.com/start-runner/start): [start-clean-css](https://github.com/start-runner/clean-css)
+
+## How to use clean-css from web browser?
+
+* https://jakubpawlowicz.github.io/clean-css/ (official web interface)
+* http://refresh-sf.com/
+* http://adamburgess.github.io/clean-css-online/
+
+# Contributing
+
+See [CONTRIBUTING.md](https://github.com/jakubpawlowicz/clean-css/blob/master/CONTRIBUTING.md).
+
+## How to get started?
+
+First clone the sources:
+
+```bash
+git clone git@github.com:jakubpawlowicz/clean-css.git
+```
+
+then install dependencies:
+
+```bash
+cd clean-css
+npm install
+```
+
+then use any of the following commands to verify your copy:
+
+```bash
+npm run bench # for clean-css benchmarks (see [test/bench.js](https://github.com/jakubpawlowicz/clean-css/blob/master/test/bench.js) for details)
+npm run browserify # to create the browser-ready clean-css version
+npm run check # to lint JS sources with [JSHint](https://github.com/jshint/jshint/)
+npm test # to run all tests
+```
+
+# Acknowledgments
+
+Sorted alphabetically by GitHub handle:
+
+* [@abarre](https://github.com/abarre) (Anthony Barre) for improvements to `@import` processing;
+* [@alexlamsl](https://github.com/alexlamsl) (Alex Lam S.L.) for testing early clean-css 4 versions, reporting bugs, and suggesting numerous improvements.
+* [@altschuler](https://github.com/altschuler) (Simon Altschuler) for fixing `@import` processing inside comments;
+* [@ben-eb](https://github.com/ben-eb) (Ben Briggs) for sharing ideas about CSS optimizations;
+* [@facelessuser](https://github.com/facelessuser) (Isaac) for pointing out a flaw in clean-css' stateless mode;
+* [@jmalonzo](https://github.com/jmalonzo) (Jan Michael Alonzo) for a patch removing node.js' old `sys` package;
+* [@lukeapage](https://github.com/lukeapage) (Luke Page) for suggestions and testing the source maps feature;
+  Plus everyone else involved in [#125](https://github.com/jakubpawlowicz/clean-css/issues/125) for pushing it forward;
+* [@madwizard-thomas](https://github.com/madwizard-thomas) for sharing ideas about `@import` inlining and URL rebasing.
+* [@ngyikp](https://github.com/ngyikp) (Ng Yik Phang) for testing early clean-css 4 versions, reporting bugs, and suggesting numerous improvements.
+* [@wagenet](https://github.com/wagenet) (Peter Wagenet) for suggesting improvements to `@import` inlining behavior;
+* [@venemo](https://github.com/venemo) (Timur Kristóf) for an outstanding contribution of advanced property optimizer for 2.2 release;
+* [@vvo](https://github.com/vvo) (Vincent Voyer) for a patch with better empty element regex and for inspiring us to do many performance improvements in 0.4 release;
+* [@xhmikosr](https://github.com/xhmikosr) for suggesting new features, like option to remove special comments and strip out URLs quotation, and pointing out numerous improvements like JSHint, media queries, etc.
+
+# License
+
+clean-css is released under the [MIT License](https://github.com/jakubpawlowicz/clean-css/blob/master/LICENSE).