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