Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    var treeTraversal = $("span").parents().map(function(){
    return this.tagName;}).get().join(", ");
    $("span").after("<h2>" + treeTraversal + "<h2>");
});
</script>
</head>

<body>
  <div>    
    <p>             
      <span>This is is a span element. My ancestors are: </span>    
    </p>  
  </div>
</body>

</html>