HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>copy title</title>
  <style>body{font-family:sans-serif;margin:1rem;} button{margin-right:0.5rem;padding:0.5rem 1rem;}</style>
</head>
<body>
  <button type="button" id="source" title="Save document">Source</button>
  <button type="button" id="target">Target</button>
  <pre id="out"></pre>
  <script>
    var source = document.getElementById("source");
    var target = document.getElementById("target");
    var titleAttr = source.getAttributeNode("title");
    target.setAttributeNode(titleAttr.cloneNode(true));
    document.getElementById("out").textContent = target.getAttribute("title");
  </script>
</body>
</html>

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Element.setAttributeNode — copy title (Try It)