The ariaExpanded property of the Element interface reflects the value of the aria-expanded attribute, which indicates whether a grouping element owned or controlled by this element is expanded or collapsed.


var ariaExpanded = element.ariaExpanded;
element.ariaExpanded = ariaExpanded


A DOMString with one of the following values:

The grouping element this element owns or controls is collapsed.
The grouping element this element owns or controls is expanded.
The element does not own or control a grouping element that is expandable.


In this example the aria-expanded attribute on the element with an ID of animal is set to "false". Using ariaExpanded we update the value to "true".

<div class="animals-combobox">
  <label for="animal">Animal</label>
  <input id="animal" type="text" role="combobox" aria-autocomplete="list" aria-expanded="false" aria-haspopup="true">
  <button id="animals-button" tabindex="-1" aria-label="Open"></button>
  <ul id="animals-listbox" role="listbox" aria-label="Animals">
    <li id="animal-cat" role="option">Cat</li>
    <li id="animal-dog" role="option">Dog</li>
let el = document.getElementById('animal');
console.log(el.ariaExpanded); // false
el.ariaExpanded = "true";
console.log(el.ariaExpanded); // true


Specification Status Comment
Accessible Rich Internet Applications (WAI-ARIA) 1.2
The definition of 'ariaExpanded' in that specification.
Working Draft Initial definition.

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