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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 index position 2 of the table row.</p><table> <tr id="myRow"> <td>First cell (index 0)</td> <td>Second cell (index 1)</td> <td>Third cell (index 2)</td> </tr></table><br><button onclick="myFunction()">Try it</button><script>function myFunction() { var row = document.getElementById("myRow"); var x = row.insertCell(2); x.innerHTML = "New cell";}</script></body></html>