ElementInternals: ariaSetSize property

Baseline 2023

Newly available

Since ⁨October 2023⁩, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

TheariaSetSize property of theElementInternals interface reflects the value of thearia-setsize attribute, which defines the number of items in the current set of listitems or treeitems.

Note:Setting aria attributes onElementInternals allows default semantics to be defined on a custom element. These may be overwritten by author-defined attributes, but ensure that default semantics are retained should the author delete those attributes, or fail to add them at all. For more information see theAccessibility Object Model explainer.

Value

A string containing an integer.

Examples

In this example the value ofariaSetSize is set to "4".

class CustomControl extends HTMLElement {  constructor() {    super();    this.internals_ = this.attachInternals();    this.internals_.ariaSetSize = "4";  }  // …}