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This feature is well established and works across many devices and browser versions. Its been available across browsers since October 2023.
The ariaPosInSet property of the Element interface reflects the value of the aria-posinset attribute, which defines an element's number or position in the current set of listitems or treeitems.
A string containing an integer.
In this example the aria-posinset attribute on the element with an ID of article2 is set to "2". Using ariaPosInSet we update the value to "3".
<article id="article1" aria-posinset="1"></article>
<article id="article2" aria-posinset="2"></article>
let el = document.getElementById("article2");
console.log(el.ariaPosInSet); // "2"
el.ariaPosInSet = "3";
console.log(el.ariaPosInSet); // "3"
| Specification |
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| Accessible Rich Internet Applications (WAI-ARIA) # dom-ariamixin-ariaposinset |
This page was last modified on Mar 6, 2025 by MDN contributors.
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