visibility-observer adds events for visibility-changes of HTML elements. It extends the Intersection Observer API with Document focus & visibility-checks and provides an all-in-one solution for ...

To complete the challenges and build this project you'll need a basic understanding of JavaScript. You can start by completing the #100Devs JavaScript Basics: Classes ...

Here's what beginning and experienced developers need to know about working with JavaScript's array, for loop, forEach, map, reduce, substring, and switch. Research suggests there are seven JavaScript ...