An understanding of DOM Manipulation in JavaScript. This article gives a thorough explanation of how forEach loops work. To learn more about loops, visit this article called For Loops, For…Of Loops and For…In Loops in JavaScript. An understanding of JavaScript for and forEach loops. The How To Build a Website With CSS series can help you to achieve this. The How To Build a Website with HTML series is a great place to start. To successfully complete this tutorial, you will need the following: You will also implement React Observer in your own front end code and test for browser support. In this tutorial, you will learn about basic usage of React Observer. This is more and more frequent with modern single-page apps. There’s also another use case for the Resize Observer API that the window’s resize event can’t help us with: when elements are added or removed from the DOM dynamically, influencing the size of the parent element. In other words, using window.resize is often wasteful because it informs us of every viewport size change, not just when an element’s size actually changes. This can easily lead to performance problems due to the large amount of triggered event. Up until this point, we’ve had to rely on the global window.resize event to listen for resize events and check if certain elements have changed size. The most frequent reason for an element’s size to change is when the viewport is resized or the device’s direction changes between portrait and landscape. It allows for elements to be notified when their size changes. Window.Resize Observer is a new JavaScript API that’s very similar to other observer APIs like the Intersection Observer API. It will run every time the browser is resized. When a resizing of the browser is detected, the function below will run The genRandomColor function below will generate a random color for us We will detect the window resize using the addEventListener() method. 
When we resize the window, we will generate a random color and then change the background color of the div. Notice every time the box color changes when you drag the corner of the browser window to resize it. Resize the window to change the color of the box. window.addEventListener("resize", function(event) We can use JavaScript to detect a window resize by using the addEventListener() method on the window object.
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