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<!DOCTYPE html>
<html>
<head>
<style>
table, td {
  border: 1px solid black;
}
</style>
</head>
<body>
<p>Click the button to get the number of tbody elements in the table.</p>
<table id="myTable">
  <tbody>
    <tr>
      <td>cell 1</td>
      <td>cell 2</td>
    </tr>
  </tbody>
  <tbody>
    <tr>
      <td>cell 3</td>
      <td>cell 4</td>
    </tr>
  </tbody>
</table>
<br> 
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myTable").tBodies.length;
  document.getElementById("demo").innerHTML = "Found " + x + " tbody elements in the table.";
}
</script>
</body>
</html>