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UnCSS is a tool that removes unused CSS from your stylesheets. It works across multiple files and supports Javascript-injected CSS. UnCSS cannot be run on non-HTML pages, such as templates or PHP files. If you need to run UnCSS against your templates, you should probably generate example HTML pages from your templates, and run uncss on those generated files; or run a live local dev server, and point uncss at that. UnCSS only runs the Javascript that is run on page load. It does not (and cannot) handle Javascript that runs on user interactions like button clicks. You must use the ignore option to preserve classes that are added by Javascript on user interaction. UnCSS can also be used in conjunction with other JavaScript build systems, such as Grunt, Broccoli or Gulp! Note that you can pass both local file paths (which are processed by glob) and URLs to the program.
Features
- The HTML files are loaded by jsdom and JavaScript is executed
- All the stylesheets are parsed by PostCSS
- document.querySelector filters out selectors that are not found in the HTML files
- The remaining rules are converted back to CSS
- UnCSS can also be used in conjunction with other JavaScript build systems
- Supply the options used to create the JSDOM pages
- Give the task a raw string of CSS in addition to the existing stylesheet options
Project Samples
