HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaRelevant read</title>
</head>
<body>
  <div
    id="clock"
    role="timer"
    aria-live="polite"
    aria-atomic="true"
    aria-relevant="all"
  >12:00</div>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      String(document.getElementById("clock").ariaRelevant);
  </script>
</body>
</html>

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Element.ariaRelevant — read (Try It)