HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createAttribute props</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <button id="btn">Create disabled Attr</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var button = document.createElement("button");
      button.textContent = "Save";
      var disabledAttr = document.createAttribute("disabled");
      disabledAttr.value = "";
      button.setAttributeNode(disabledAttr);
      document.getElementById("out").textContent = JSON.stringify({
        name: disabledAttr.name,
        value: disabledAttr.value,
        ownerTag: disabledAttr.ownerElement ? disabledAttr.ownerElement.tagName : null,
        specified: disabledAttr.specified
      }, null, 2);
    });
  </script>
</body>
</html>

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Document.createAttribute — Attr properties (Try It)