This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The IntersectionObserverEntry interface's read-only boundingClientRect property returns a DOMRectReadOnly which in essence describes a rectangle describing the smallest rectangle that contains the entire target element.


var boundsRect = IntersectionObserverEntry.boundingClientRect;


A DOMRectReadOnly which describes the smallest rectangle that contains every part of the target element whose intersection change is being described. This value is obtained using the same algorithm as Element.getBoundingClientRect(), so refer to that article for details on precisely what is done to obtain this rectangle and what is and is not included within its bounds.

In the general case, however, it's safe to simply think of this as the bounds rectangle of the target element.


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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support5115


53 — 551

No ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support5151 Yes ? ? ?5.0

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.

Document Tags and Contributors

Contributors to this page: fscholz, Sheppy
Last updated by: fscholz,