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<!DOCTYPE html> <html> <head> <style> table, td { border: 1px solid black; } </style> </head> <body> <p>Click the buttons to create and delete a thead element for the table.</p> <table id="myTable"> <tr> <td>cell 1</td> <td>cell 2</td> </tr> <tr> <td>cell 3</td> <td>cell 4</td> </tr> </table> <br> <button onclick="myCreateFunction()">Create thead</button> <button onclick="myDeleteFunction()">Delete thead</button> <script> function myCreateFunction() { var table = document.getElementById("myTable"); var header = table.createTHead(); var row = header.insertRow(0); var cell = row.insertCell(0); cell.innerHTML = "<b>This is a table header</b>"; } function myDeleteFunction() { document.getElementById("myTable").deleteTHead(); } </script> </body> </html>