Intersection Observer

Category: Performance
Type: New or changed feature
Status: Enabled by default (Chrome 51)
Intent stage: None

Summary

The Intersection Observer API can be used to asynchronously observe changes in the intersection of a target Element with an ancestor element (for infinite scrolling lists) or the top-level document's viewport (for 'viewability' tracking).

Standards & signals

Specification: https://w3c.github.io/IntersectionObserver/
Firefox: Shipped/Shipping
Safari: In development
Web developers: Positive
Tracking bug: https://crbug.com/540528

Docs: https://github.com/WICG/IntersectionObserver/blob/gh-pages/explainer.md https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API

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