HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clone required</title>
  <style>body{font-family:sans-serif;margin:1rem;} div{padding:0.5rem;margin:0.35rem 0;border:1px solid #cbd5e1;border-radius:6px;}</style>
</head>
<body>
  <div id="one" xmlns:myNS="http://www.mozilla.org/ns/specialspace" myNS:special-align="utterleft">one</div>
  <div id="two">two</div>
  <pre id="out"></pre>
  <script>
    var MY_NS = "http://www.mozilla.org/ns/specialspace";
    var d1 = document.getElementById("one");
    var d2 = document.getElementById("two");
    var a = d1.getAttributeNodeNS(MY_NS, "special-align");
    d2.setAttributeNodeNS(a.cloneNode(true));
    document.getElementById("out").textContent = "cloned value: " + d2.getAttributeNS(MY_NS, "special-align");
  </script>
</body>
</html>

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Element.setAttributeNodeNS — clone required (Try It)