HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaRoleDescription MDN</title>
</head>
<body>
  <div
    id="myApplication"
    role="application"
    aria-roledescription="a description of this widget"
  >Widget content</div>
  <pre id="out"></pre>
  <script>
    var el = document.getElementById("myApplication");
    var lines = [el.ariaRoleDescription];
    el.ariaRoleDescription = "an updated description of this widget";
    lines.push(el.ariaRoleDescription);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.ariaRoleDescription — MDN update (Try It)