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<!DOCTYPE html> <html> <head> <style> table, td { border: 1px solid black; } </style> </head> <body> <table> <tr> <td>Row 1</td> </tr> <tr> <td>Row 2</td> </tr> <tr> <td>Row 3</td> </tr> </table> <p>Click the button to return the position of each row in the table.</p> <p id="demo"></p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementsByTagName("tr"); var txt = ""; var i; for (i = 0; i < x.length;i++) { txt = txt + "The index of Row "+(i+1)+" is: "+x[i].rowIndex+"<br>"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>