I can't add className using element.classList.add(<className>) · facebook docusaurus · Discussion #9104 · GitHub
![Adding tests to video player code - JavaScript - SitePoint Forums | Web Development & Design Community Adding tests to video player code - JavaScript - SitePoint Forums | Web Development & Design Community](https://global.discourse-cdn.com/sitepoint/original/3X/e/a/ea8bc4f8e64d12b3dfade966ff8eea0a1995f558.png)
Adding tests to video player code - JavaScript - SitePoint Forums | Web Development & Design Community
![How to detect changes to the DOM element's classes using MutationObserver — JavaScript | by Prasanna Vaidya | Medium How to detect changes to the DOM element's classes using MutationObserver — JavaScript | by Prasanna Vaidya | Medium](https://miro.medium.com/v2/resize:fit:1094/1*7RxJjllwkZyE3wCcIz1W1A.png)
How to detect changes to the DOM element's classes using MutationObserver — JavaScript | by Prasanna Vaidya | Medium
![Dave DeSandro on X: "Vanilla JS tip: classList.toggle has a 2nd parameter to add or remove if true or false. Saves you an if statement https://t.co/hSSEEzWMHv" / X Dave DeSandro on X: "Vanilla JS tip: classList.toggle has a 2nd parameter to add or remove if true or false. Saves you an if statement https://t.co/hSSEEzWMHv" / X](https://pbs.twimg.com/media/Ez7AKyUXMAEhtWe.jpg:large)