Baseline 2023
Newly available
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.
A string with one of the following values:
"true"
The grouping element this element owns or controls is expanded.
"false"
The grouping element this element owns or controls is collapsed.
"undefined"
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">â½</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>
</ul>
</div>
let el = document.getElementById("animal");
console.log(el.ariaExpanded); // false
el.ariaExpanded = "true";
console.log(el.ariaExpanded); // true
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