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<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
  border: 1px solid black;
}
</style>
</head>
<body>
<table id="myTable">
 <thead>
   <tr>
     <th>Header</th>
   </tr>
  </thead>
 <tbody>
   <tr>
     <td>Cell 1</td>
   </tr>
   <tr>
     <td>Cell 2</td>
   </tr>
  </tbody>
</table>
<p>Click the button to create a TFOOT element (and a TR and a TD).</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  var x = document.createElement("TFOOT");
  var y = document.createElement("TR");
  var z = document.createElement("TD");
  z.innerHTML = "A Footer!"
  y.appendChild(z);
  x.appendChild(y);
  document.getElementById("myTable").appendChild(x);
}
</script>
</body>
</html>