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<html><head><style>table, td { border: 1px solid black;}</style></head><body><p>Click on each td element to alert its position in the table row.</p><table> <tr> <td onclick="myFunction(this)">Click to show cellIndex</td> <td onclick="myFunction(this)">Click to show cellIndex</td> <td onclick="myFunction(this)">Click to show cellIndex</td> <td onclick="myFunction(this)">Click to show cellIndex</td> </tr></table><script>function myFunction(x) { alert("Cell index is: " + x.cellIndex);}</script></body></html>