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+# UnRoot [![Build Status][ci-img]][ci]
+
+<img align="right" width="135" height="95" src="http://postcss.github.io/postcss/logo-leftp.png" title="Philosopher’s stone, logo of PostCSS">
+
+[UnRoot] replaces selectors containing `:root` with `html`. This can be useful for outputting CSS for older browsers like Internet Explorer 8.
+
+```css
+/* before */
+
+:root {
+    background-color: black;
+    color: white;
+}
+
+/* after */
+
+html {
+    background-color: black;
+    color: white;
+}
+```
+
+## Usage
+
+Follow these steps to use [UnRoot].
+
+Add [UnRoot] to your build tool:
+
+```bash
+npm install postcss-unroot --save-dev
+```
+
+#### Node
+
+```js
+require('postcss-unroot')({ /* options */ }).process(YOUR_CSS);
+```
+
+#### PostCSS
+
+Add [PostCSS] to your build tool:
+
+```bash
+npm install postcss --save-dev
+```
+
+Load [UnRoot] as a PostCSS plugin:
+
+```js
+postcss([
+    require('postcss-unroot')({ /* options */ })
+]);
+```
+
+#### Gulp
+
+Add [Gulp PostCSS] to your build tool:
+
+```bash
+npm install gulp-postcss --save-dev
+```
+
+Enable [UnRoot] within your Gulpfile:
+
+```js
+var postcss = require('gulp-postcss');
+
+gulp.task('css', function () {
+    return gulp.src('./css/src/*.css').pipe(
+        postcss([
+            require('postcss-unroot')({ /* options */ })
+        ])
+    ).pipe(
+        gulp.dest('./css')
+    );
+});
+```
+
+#### Grunt
+
+Add [Grunt PostCSS] to your build tool:
+
+```bash
+npm install grunt-postcss --save-dev
+```
+
+Enable [UnRoot] within your Gruntfile:
+
+```js
+grunt.loadNpmTasks('grunt-postcss');
+
+grunt.initConfig({
+    postcss: {
+        options: {
+            processors: [
+                require('postcss-unroot')({ /* options */ })
+            ]
+        },
+        dist: {
+            src: 'css/*.css'
+        }
+    }
+});
+```
+
+### Options
+
+#### `method`
+
+Type: `String`  
+Default: `'replace'`
+
+##### `replace`
+Replace any selectors with `:root` with `html`.
+```css
+/* before */
+
+:root {
+    color: red;
+}
+
+/* after */
+
+html {
+    color: red;
+}
+```
+
+##### `copy`
+Copy any selectors with `:root` into a cloned rule as `html`.
+```css
+/* before */
+
+:root {
+    color: red;
+}
+
+/* after */
+
+html {
+    color: red;
+}
+
+:root {
+    color: red;
+}
+```
+
+##### `warn`
+Warn when a `:root` selector is used.
+
+[ci]: https://travis-ci.org/jonathantneal/postcss-unroot
+[ci-img]: https://travis-ci.org/jonathantneal/postcss-unroot.svg
+[Gulp PostCSS]: https://github.com/postcss/gulp-postcss
+[Grunt PostCSS]: https://github.com/nDmitry/grunt-postcss
+[PostCSS]: https://github.com/postcss/postcss
+[UnRoot]: https://github.com/jonathantneal/postcss-unroot