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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaHidden MDN</title>
</head>
<body>
  <div id="hidden" aria-hidden="true">Some things are better left unsaid.</div>
  <pre id="out"></pre>
  <script>
    var el = document.getElementById("hidden");
    var lines = [el.ariaHidden];
    el.ariaHidden = "false";
    lines.push(el.ariaHidden);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.ariaHidden — MDN set false (Try It)