HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaDescription create</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var btn = document.createElement("button");
    btn.textContent = "X";
    btn.setAttribute("aria-label", "Close");
    document.body.insertBefore(btn, document.getElementById("out"));
    btn.ariaDescription = "Closes the dialog without saving changes.";
    document.getElementById("out").textContent = JSON.stringify({
      name: btn.getAttribute("aria-label"),
      ariaDescription: btn.ariaDescription,
      attr: btn.getAttribute("aria-description")
    }, null, 2);
  </script>
</body>
</html>

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Element.ariaDescription — create + set (Try It)