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Result Size: 625 x 571
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​x
 
<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
  border: 1px solid black;
}
</style>
</head>
<body>
​
<h3>A demonstration of how to access a COL element</h3>
​
<table>
  <colgroup>
    <col id="myCol" span="2" style="background-color:red">
    <col style="background-color:yellow">
  </colgroup>
  <tr>
    <th>ISBN</th>
    <th>Title</th>
    <th>Price</th>
  </tr>
  <tr>
    <td>3476896</td>
    <td>My first HTML</td>
    <td>$53</td>
  </tr>
  <tr>
    <td>5869207</td>
    <td>My first CSS</td>
    <td>$49</td>
  </tr>
</table>
​
<p>Click the button to get the number of columns a COL element should span.</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myCol").span;
  document.getElementById("demo").innerHTML = x;
}
</script>
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