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<html><head><style>table, td { border: 1px solid black;}</style></head><body><p>Click the button to insert new cell(s) at the end of the table row.</p><table> <tr id="myRow"> <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 row = document.getElementById("myRow"); var x = row.insertCell(-1); x.innerHTML = "New cell";}</script></body></html>