HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaLive set</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var status = document.createElement("div");
    status.setAttribute("role", "status");
    status.textContent = "Ready";
    document.body.insertBefore(status, document.getElementById("out"));
    status.ariaLive = "polite";
    document.getElementById("out").textContent = JSON.stringify({
      ariaLive: status.ariaLive,
      attr: status.getAttribute("aria-live")
    }, null, 2);
  </script>
</body>
</html>

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Element.ariaLive — set polite (Try It)