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# Pixrem [![Build Status](https://travis-ci.org/robwierzbowski/node-pixrem.png?branch=master)](https://travis-ci.org/robwierzbowski/node-pixrem) [PostCSS](https://github.com/ai/postcss) plugin that generates pixel fallbacks for rem units. ## Installation `npm install --save pixrem` ## Usage Pixrem is a CSS post-processor that, given CSS and a root em value, returns CSS with pixel unit fallbacks or replacements. It's based on [browser data](http://caniuse.com/rem) so only needed fallbacks will be added. Basically, it's for IE8 or less, and for IE9 & IE10 in the `font` shorthand property and in pseudo-elements. ### Example ```js 'use strict'; var fs = require('fs'); var pixrem = require('pixrem'); var postcss = require('postcss'); var css = fs.readFileSync('main.css', 'utf8'); var processedCss = postcss([pixrem]).process(css).css; fs.writeFile('main.with-fallbacks.css', processedCss, function (err) { if (err) { throw err; } console.log('IE8, you\'re welcome.'); }); ``` Pixrem takes this: ```css .sky { margin: 2.5rem 2px 3em 100%; color: blue; } @media screen and (min-width: 20rem) { .leaf { margin-bottom: 1.333rem; font-size: 1.5rem; } } ``` And returns this: ```css .sky { margin: 80px 2px 3em 100%; margin: 2.5rem 2px 3em 100%; color: blue; } @media screen and (min-width: 20rem) { .leaf { margin-bottom: 1.333rem; font-size: 1.5rem; } } ``` ### Options Type: `Object | Null` Default: `{rootValue: 16, replace: false, atrules: false, html: true, browsers: 'ie <= 8', unitPrecision: 3}` - `rootValue` the root element font size. Can be `px`, `rem`, `em`, `%`, or unitless pixel value. Pixrem also tries to get the root font-size from CSS (`html` or `:root`) and overrides this option. Use `html` option to disable this behaviour. - `replace` replaces rules containing `rem`s instead of adding fallbacks. - `atrules` generates fallback in at-rules too (media-queries) - `html` overrides root font-size from CSS `html {}` or `:root {}` - `browsers` sets browser's range you want to target, based on [browserslist](https://github.com/ai/browserslist) - `unitPrecision` control the significant digits after the decimal point ## Contribute Report bugs and feature proposals in the [Github issue tracker](https://github.com/robwierzbowski/node-pixrem/issues). Run tests with `npm test`. In lieu of a formal styleguide, take care to maintain the existing coding style. ## License [MIT](http://en.wikipedia.org/wiki/MIT_License) [![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/robwierzbowski/node-pixrem/trend.png)](https://bitdeli.com/free "Bitdeli Badge")