This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The IntersectionObserverEntry interface's read-only rootBounds property is a DOMRectReadOnly corresponding to the target's root intersection rectangle, offset by the IntersectionObserver.rootMargin if one is specified.
var rootBounds = IntersectionObserverEntry.rootBounds;
A DOMRectReadOnly which describes the root intersection rectangle. For roots which are the Document's viewport, this rectangle is the bounds rectangle of the entire document. Otherwise, it's the bounds of the root element.
This rectangle is offset by the values in IntersectionObserver.rootMargin.
| Specification | Status | Comment |
|---|---|---|
| Intersection Observer The definition of 'IntersectionObserverEntry.rootBounds' in that specification. | Working Draft | Initial definition |
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 51 | 15 |
53 — 551 55 |
No | ? | ? |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic support | 51 | 51 | Yes | ? | No | ? | ? |
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.
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https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserverEntry/rootBounds