HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>removeAttributeNS specialAlign</title>
  <style>
    #div1 { padding: 12px; border: 1px solid #ccc; margin: 8px 0; }
  </style>
</head>
<body>
  <div id="div1" xmlns:special="http://www.mozilla.org/ns/specialspace" special:specialAlign="utterleft" width="200px">Namespaced div</div>
  <button type="button" id="btn">remove specialAlign</button>
  <pre id="out">—</pre>
  <script>
    var SPECIAL_NS = "http://www.mozilla.org/ns/specialspace";
    document.getElementById("btn").addEventListener("click", function () {
      var d = document.getElementById("div1");
      d.removeAttributeNS(SPECIAL_NS, "specialAlign");
      document.getElementById("out").textContent =
        "hasAttributeNS specialAlign: " + d.hasAttributeNS(SPECIAL_NS, "specialAlign");
    });
  </script>
</body>
</html>

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Element.removeAttributeNS — specialAlign (Try It)