<!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>
</body>
</html>