Helium CSS

Helium is a tool for discovering unused CSS across many pages on a web site.

The tool is javascript-based and runs from the browser.

Helium accepts a list of URLs for different sections of a site then loads and parses each page to build up a list of all stylesheets. It then visits each page in the URL list and checks if the selectors found in the stylesheets are used on the pages. Finally, it generates a report that details each stylesheet and the selectors that were not found to be used on any of the given pages.