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<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
  border: 1px solid black;
}
</style>
</head>
<body>
​
<p>Click the button to change the value of the colspan attribute, from 2 to 1, of td with id "myTd".</p>
​
<table>
  <tr>
    <th>Month</th>
    <th>Savings</th>
  </tr>
  <tr>
    <td id="myTd" colspan="2">January</td>
    <td>$100</td>
  </tr>
  <tr>
    <td>February</td>
    <td>$100</td>
  </tr>
</table>
<br> 
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
  document.getElementById("myTd").colSpan = "1";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_td_colspan2 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:17:50 GMT -->
</html>
​
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