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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } </style> </head> <body> <h3>A demonstration of how to access a TH element</h3> <table> <tr> <th id="myTh">Name</th> </tr> <tr> <td>John</td> </tr> </table> <p>Click the button to change the text of the TH element.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myTh"); x.innerHTML = "New Table Header"; } </script> </body> </html>