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<html><head><style>table, th { border: 1px solid black;}</style></head><body><table border="1"> <tr> <th>Cell 1</th> <th>Cell 2</th> <th>Cell 3</th> <th>Cell 4</th> </tr></table><p>Click the button to return the position of each cell in the table row.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementsByTagName("th"); 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>