How to hide an HTML element only when JavaScript is already running?

The article on Frontend Masters discusses the challenges associated with the approach of progressive enhancement in web development. Progressive enhancement is a design technique that focuses on building applications that work in basic browsers while then enriching them with additional features in more advanced environments. The author highlights the importance of tailoring applications for different devices and connection speeds, as well as the challenges that may arise during this process. Furthermore, practical examples and exercises are provided to help understand this concept and its application in real-world projects. The article also contains a section on tools and techniques that can facilitate the implementation of this approach, making it a valuable resource for developers.