Making the Job Easier

In the code we are about to build, we will use the standard JavaScript and DOM APIs to do all the work we need. The features we plan to use are the following:

• classList
  
• addEventListener()
  
• NodeList.forEach()
  
• querySelector() and querySelectorAll()

Building Event Callbacks

The groundwork is done. We can now start to define all the functions that will be used each tim...