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<html><head><style>table, td { border: 1px solid black;}</style></head><body><table> <tr> <td>Cell 1</td> <td>Cell 2</td> <td>Cell 3</td> <td>Cell 4</td> </tr></table><p>Click the button to return the position of each cell in the table row.</p><p id="demo"></p><button onclick="myFunction()">Try it</button><script>function myFunction() { var x = document.getElementsByTagName("td"); var txt = ""; var i; for (i = 0; i < x.length; i++) { txt = txt + "The index of Cell " + (i + 1) + " is: " + x[i].cellIndex + "<br>"; } document.getElementById("demo").innerHTML = txt;}</script></body></html>