Websites using Intersection Observer

About Intersection Observer

Intersection Observer is a browser API that provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element or the document's viewport. It's commonly used for lazy loading images, infinite scroll, and triggering animations.

Identifying Intersection Observer in a website's stack reveals key decisions about its architecture, performance strategy, and development approach. Web Reveal automatically detects Intersection Observer and hundreds of other technologies by analyzing page source, HTTP headers, and JavaScript signatures—giving you instant insight into how any site is built.