HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaLive MDN</title>
</head>
<body>
  <div role="region" id="planetInfo" aria-live="polite">
    <h2 id="planetTitle">No planet selected</h2>
    <p id="planetDescription">Select a planet to view its description</p>
  </div>
  <pre id="out"></pre>
  <script>
    var el = document.getElementById("planetInfo");
    var lines = [el.ariaLive];
    el.ariaLive = "assertive";
    lines.push(el.ariaLive);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.ariaLive — MDN assertive (Try It)