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<!DOCTYPE html> <html> <head> <style> table, th { border: 1px solid black; } </style> </head> <body> <p>Click on each th element to alert its index position in the table row.</p> <table> <tr> <th onclick="myFunction(this)">Click to show cellIndex</th> <th onclick="myFunction(this)">Click to show cellIndex</th> <th onclick="myFunction(this)">Click to show cellIndex</th> <th onclick="myFunction(this)">Click to show cellIndex</th> </tr> </table> <script> function myFunction(x) { alert("Cell index is: " + x.cellIndex); } </script> </body> </html>