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Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.


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Use uncss as a postcss plugin





npm npm

Use uncss as a PostCSS plugin.


UnCSS is a tool that removes unused CSS from your stylesheets. It works across multiple files and supports Javascript-injected CSS.



  <p class="red">Hello World!</p>

css before:

.red {
  color: red;
.blue {
  color: blue;

css after:

.red {
  color: red;


The HTML files are loaded by jsdom and JavaScript is executed. UnCSS filters out selectors that are not found in the HTML files.

See the UnCSS docs for more information.


postcss-uncss specifies UnCSS as a peerDependency, so you will have to install UnCSS as well.

npm install postcss-uncss uncss

postcss-uncss' MAJOR & MINOR version numbers correspond to UnCSS' version numbers; however, the PATCH version number may differ.


postcss([ require('postcss-uncss') ])

See PostCSS docs for examples for your environment.


  • html (Array): provide a list of html files to parse for selectors and elements. Usage of globs is allowed.

  • ignore (Array): provide a list of selectors that should not be removed by UnCSS. For example, styles added by user interaction with the page (hover, click), since those are not detectable by UnCSS yet. Both literal names and regex patterns are recognized. Otherwise, you can add a comment before specific selectors in your css:

    /* uncss:ignore */
    .selector1 {
        /* this rule will be ignored */
    .selector2 {
        /* this will NOT be ignored */

Example Configuration

  html: ['index.html', 'about.html', 'team/*.html'],
  ignore: ['.fade']