<!DOCTYPE html>
<html>
<head>
<style>
table, td {
border: 1px solid black;
}
</style>
</head>
<body>
<table>
<thead>
<tr>
<th>Row 1</th>
</tr>
<tr>
<th>Row 2</th>
</tr>
</thead>
<tbody>
<tr>
<td>Row 3</td>
</tr>
<tr>
<td>Row 4</td>
</tr>
</tbody>
<tfoot>
<tr>
<td>Row 5</td>
</tr>
<tr>
<td>Row 6</td>
</tr>
</tfoot>
</table>
<p>Click the button to return the position of the rows in the thead, tbody, and tfoot rows collection.</p>
<p id="demo"></p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
var x = document.getElementsByTagName("tr");