Intersection Observer

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).

Documentation

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

Specification

Working draft or equivalent

Status in Chromium

Blink components: Blink>Layout

Enabled by default (tracking bug) in:

• Chrome for desktop release 51
• Chrome for Android release 51
• Android WebView release 51
• Opera release 38
• Opera for Android release 38

Consensus & Standardization

• Firefox: Shipped
• Edge: Shipped
• Safari: In development
• Web Developers: Positive

Owners

• mpb@chromium.org
• ojan@chromium.org
• szager@chromium.org

Last updated on 2017-12-13