This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
observe() adds an element to the set of target elements being watched by the
IntersectionObserver. One observer has one set of thresholds and one root, but can watch multiple target elements for visibility changes in keeping with those. To stop observing the element, call
When the visibility of the specified element crosses over one of the observer's visibility thresholds (as listed in
IntersectionObserver.thresholds, the observer's callback is executed with an
IntersectionObserverEntry representing the intersection change which occurred. Note that this design allows multiple elements' intersection changes to be processed by a single call to the callback using an array of
elementwhose visibility within the root is to be monitored. This element must be a descendant of the root element (or contained wtihin the current document, if the root is the document's viewport).
The definition of 'IntersectionObserver.observe()' in that specification.
|Editor's Draft||Initial definition.|
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
53 — 551
|Feature||Android||Chrome for Android||Edge mobile||Firefox for Android||IE mobile||Opera Android||iOS Safari|
1. From version 53 until version 55 (exclusive): this feature is behind the
dom.IntersectionObserver.enabled preference (needs to be set to
true). To change preferences in Firefox, visit about:config.