Chris Ferdinandi • 6/8/2026

How to detect when an element's visibility changes with JavaScript

This article explains how to use the JavaScript IntersectionObserver API to detect when an element's visibility changes, particularly useful for web components that need to recalculate size or layout when hidden elements become visible. It covers a real-world use case involving nested components and the [hidden] attribute, providing code examples for creating an observer and triggering callbacks on visibility changes.

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#JavaScript #web components #Intersectionobserver