Web Reference: Jun 29, 2025 · Instead of relying on scroll events and manual calculations, you can use IntersectionObserver to detect when an element becomes visible and then trigger an animation using CSS or JavaScript. Before we can track the intersection of an element with a container, we need to know what that container is. That container is the intersection root, or root element. This can be either a specific element in the document which is an ancestor of the element to be observed, or nullto use the document's viewport as the container. The root intersection... Mar 24, 2023 · In this article, you'll learn how to build a simple web page with HTML, CSS and JavaScript. Then you'll use the Intersection Observer API to implement a simple scroll animation. So you might be wondering, what happens when you define an observer call-back function?
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