HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>removeAttribute data</title>
</head>
<body>
  <button type="button" id="btn" data-action="save">Save</button>
  <button type="button" id="clear">removeAttribute data-action</button>
  <pre id="out">—</pre>
  <script>
    document.getElementById("clear").addEventListener("click", function () {
      var btn = document.getElementById("btn");
      btn.removeAttribute("data-action");
      document.getElementById("out").textContent =
        "hasAttribute: " + btn.hasAttribute("data-action") + "\ndataset.action: " + btn.dataset.action;
    });
  </script>
</body>
</html>

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Element.removeAttribute — data-* (Try It)