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.

The IntersectionObserverEntry interface of the Intersection Observer API provides information about the intersection of a particular target with the observers root element at a particular time. Instances of this interface cannot be created, but a list of them is returned by IntersectionObserver.takeRecords().


IntersectionObserverEntry.boundingClientRect Read only
Returns a DOMRectReadOnly for the intersection observer's target.
IntersectionObserverEntry.intersectionRatio Read only
Returns the ratio of the intersectionRect to the boundingClientRect.
IntersectionObserverEntry.intersectionRect Read only
Returns a DOMRectReadOnly for the visible portion of the intersection observer's target.
IntersectionObserverEntry.rootBounds Read only
Returns a DOMRectReadOnly for the intersection observer's root.
IntersectionObserverEntry.time Read only
Returns a DOMHightResTimeStamp indicating when the intersection occurred.


Specification Status Comment
Intersection Observer
The definition of 'IntersectionObserverEntry' in that specification.
Editor's Draft Initial definition

Browser Compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 51.0 (Yes)[1] No support[2] No support ? ?
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 51.0 (Yes)[1] No support[2] No support No support ? ? 51.0

[1] This feature is available since the Windows Insider Preview Build 14986.

[2] This feature is implemented since Gecko 53.0 (Firefox 53.0 / Thunderbird 53.0 / SeaMonkey 2.50) behind the preference dom.IntersectionObserver.enabled, defaulting to false. See bug 1243846.

Document Tags and Contributors

 Contributors to this page: erikadoyle, jpmedley, bunnybooboo, pyoor, Sebastianz
 Last updated by: erikadoyle,