Web/API/IntersectionObserver/thresholds

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The IntersectionObserver interface's read-only thresholds property returns the list of intersection thresholds that was specified when the observer was instantiated with IntersectionObserver(). If only one threshold ratio was provided when instanitating the object, this will be an array containing that single value.

See Thresholds in Intersection Observer API to learn how thresholds work.

Syntax

var thresholds = IntersectionObserver.thresholds;

Value

An array of intersection thresholds, originally specified using the threshold property when instantiating the observer. If only one observer was specified, without being in an array, this value is a one-entry array containing that threshold. Regardless of the order your original threshold array was in, this one is always sorted in numerically increasing order.

If no threshold option was included when IntersectionObserver() was used to instantiate the observer, the value of thresholds is simply [0].

Be careful! Although the options object you can specify when creating an IntersectionObserver has a field named threshold, this property is called thresholds. Confusing? Yes. If you accidentally use thresholds as the name of the field in your options, the thresholds array will wind up being simply [0.0], which is likely not what you expect. Debugging chaos may ensue.

Examples

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Specifications

Specification	Status	Comment
Intersection ObserverThe definition of 'IntersectionObserver.thresholds' in that specification.	Working Draft	Initial definition

Browser compatibility

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.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`thresholds` Experimental'	Chrome Full support 51	Edge Full support 15	Firefox Full support 55 Full support 55 No support 53 — 55 Disabled' Disabled' 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.	IE No support No	Opera Full support Yes	Safari Full support 12.1	WebView Android Full support 51	Chrome Android Full support 51	Firefox Android ?	Opera Android ?	Safari iOS Full support 12.2	Samsung Internet Android Full support 5.0

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.': User must explicitly enable this feature.

IntersectionObserver.thresholds by Mozilla Contributors is licensed under CC-BY-SA 2.5.