node-pixrem

by robwierzbowski

robwierzbowski / node-pixrem

CSS post-processor that generates pixel fallbacks for rem units.

198 Stars 24 Forks Last release: Not found MIT License 118 Commits 22 Releases

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Pixrem

Build Status

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 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

'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:

.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:

.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
  • unitPrecision
    control the significant digits after the decimal point

Contribute

Report bugs and feature proposals in the Github issue tracker. Run tests with

npm test
. In lieu of a formal styleguide, take care to maintain the existing coding style.

License

MIT

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