HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaRequired set</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var box = document.createElement("div");
    box.setAttribute("role", "textbox");
    box.setAttribute("contenteditable", "true");
    box.setAttribute("aria-label", "Article tags");
    document.body.insertBefore(box, document.getElementById("out"));
    box.ariaRequired = "true";
    document.getElementById("out").textContent = JSON.stringify({
      ariaRequired: box.ariaRequired,
      attr: box.getAttribute("aria-required")
    }, null, 2);
  </script>
</body>
</html>

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Element.ariaRequired — set true (Try It)