The ariaSelected property of the Element interface reflects the value of the aria-selected attribute, which indicates the current "selected" state of elements that have a selected state.

A string with one of the following values:

"true"

The item is selected.

"false"

The item is not selected.

"undefined"

The item is not

In this example the aria-selected attribute on the element with an ID of tab-id is set to "true". Using ariaSelected we update the value to "false".

<button role="tab" aria-selected="true" aria-controls="tabpanel-id" id="tab-id">
  Tab label
</button>

let el = document.getElementById("tab-id");
console.log(el.ariaSelected); // true
el.ariaSelected = "false";
console.log(el.ariaSelected); // false

• ARIA: tab role