classList.js is a cross-browser JavaScript shim that fully implements element.classList. Refer to the MDN page on element.classList for more information.

This works in every browser except IE 7 or earlier.

classList.js is available on these public CDN URLs, allowing you to use this already small file at nearly zero size overhead.

• https://cdnjs.cloudflare.com/ajax/libs/classlist/1.2.20171210/classList.min.js
• https://cdn.jsdelivr.net/npm/eligrey-classlist-js-polyfill@1.2.20171210/classList.min.js

If you would like other versions (such as the current one) hosted there, follow the instructions at https://github.com/jsdelivr/jsdelivr and https://github.com/cdnjs/cdnjs to prepare a pull request.