classList.js is a cross-browser JavaScript shim that fully implements `element.classList`. Refer to [the MDN page on `element.classList`][1] for more information. This works in every browser except IE 7 or earlier. An older version is hosted at public CDNs, allowing you to use this already small file at nearly zero size overhead. Use one of these URLs: - [//cdnjs.cloudflare.com/ajax/libs/classlist/2014.01.31/classList.min.js](//cdnjs.cloudflare.com/ajax/libs/classlist/2014.01.31/classList.min.js) - [//cdn.jsdelivr.net/classlist/2014.01.31/classList.min.js](//cdn.jsdelivr.net/classlist/2014.01.31/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. ![Tracking image](https://in.getclicky.com/212712ns.gif) [1]: https://developer.mozilla.org/en/DOM/element.classList "MDN / DOM / element.classList"