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<!DOCTYPE html>
<html>
<head>
<style>
table, td {
  border: 1px solid black;
}
</style>
</head>
<body>
<p>Click on each tr element to alert the position of the rows in the thead, tbody and tfoot rows collection.</p>
<table>
  <thead>
    <tr onclick="myFunction(this)">
      <th>Click to show sectionRowIndex</th>
    </tr>
    <tr onclick="myFunction(this)">
      <th>Click to show sectionRowIndex</th>
    </tr>
    </thead>
    <tbody>
    <tr onclick="myFunction(this)">
      <td>Click to show sectionRowIndex</td>
    </tr>
    <tr onclick="myFunction(this)">
      <td>Click to show sectionRowIndex</td>
    </tr>
    </tbody>
    <tfoot>
    <tr onclick="myFunction(this)">
      <td>Click to show sectionRowIndex</td>
    </tr>
    <tr onclick="myFunction(this)">
      <td>Click to show sectionRowIndex</td>
    </tr>
  </tfoot>
</table>
<script>
function myFunction(x) {
  alert("Section row index is: " + x.sectionRowIndex);
}
</script>