Web Reference: Jan 12, 2026 · The primary interface for the Intersection Observer API. Provides methods for creating and managing an observer which can watch any number of target elements for the same intersection configuration. This is where the Intersection Observer API comes to the rescue. It’s a powerful JavaScript API that allows you to efficiently detect when an element enters or exits the viewport (the visible area of the browser), enabling you to load content only when it’s needed. Dec 8, 2021 · Learn how to use the Intersection Observer API with an example. We create a sidebar which adds an active class to the active section header.
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