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

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

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