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<!DOCTYPE html> <html> <head> <style> table, td { border: 1px solid black; } </style> </head> <body> <p>Click the button to insert new cell(s) at the beginning of the first table row.</p> <table id="myTable"> <tr> <td>First cell</td> <td>Second cell</td> <td>Third cell</td> </tr> <tr> <td>First cell</td> <td>Second cell</td> <td>Third cell</td> </tr> </table><br> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var firstRow = document.getElementById("myTable").rows[0]; var x = firstRow.insertCell(0); x.innerHTML = "New cell"; } </script> </body> </html>