HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>inspect then remove Attr</title>
  <style>
    #card { padding: 12px; border: 1px solid #ccc; margin: 8px 0; }
  </style>
</head>
<body>
  <div id="card" data-role="primary">Card with data-role</div>
  <button type="button" id="btn">inspect and remove data-role</button>
  <pre id="out">—</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var card = document.getElementById("card");
      var roleAttr = card.getAttributeNode("data-role");
      var lines = [];
      if (roleAttr) {
        lines.push("removing " + roleAttr.name + " = " + roleAttr.value);
        card.removeAttributeNode(roleAttr);
        lines.push("hasAttribute data-role: " + card.hasAttribute("data-role"));
      }
      document.getElementById("out").textContent = lines.join("\n");
    });
  </script>
</body>
</html>

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Element.removeAttributeNode — inspect then remove (Try It)