InterestEvent: InterestEvent() constructor

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

See full compatibility

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

Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.

The InterestEvent() constructor creates a new InterestEvent object.

Syntax

new InterestEvent(type, init)

Parameters

type

A string representing the type of event. For InterestEvent, this is always interest or loseinterest.

init Optional

An object containing the following property:

source Optional: An Element representing the interest invoker element on which interest was shown or lost.

Examples

Normally, you would not use this constructor manually. A new InterestEvent object is constructed when a handler is invoked as a result of a relevant event firing.

See the Using interest invokers guide and the interest event reference page for examples.

Specifications

This feature does not appear to be defined in any specification.

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`InterestEvent()` constructor Experimental Non-standard	Chrome – Full support Chrome 142 (Release date: 2025-10-28) footnote Full support	Edge – Full support Edge 142 (Release date: 2025-10-31) footnote Full support	Firefox – No support Firefox footnote No support	Opera – Full support Opera 126 (Release date: 2026-01-08) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 142 (Release date: 2025-10-28) footnote Full support	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 93 (Release date: 2025-11-25) footnote Full support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – No support Samsung Internet footnote No support	WebView Android – Full support WebView Android 142 (Release date: 2025-10-28) footnote Full support	WebView on iOS – No support WebView on iOS footnote No support

Tip: you can click/tap on a cell for more information.

Full support: Full support
No support: No support
: Experimental. Expect behavior to change in the future.
: Non-standard. Check cross-browser support before using.