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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } </style> </head> <body> <h3>A demonstration of how to access a COLGROUP element</h3> <table> <colgroup id="myColgroup" span="2" style="background:red"></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 COLGROUP element should span.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myColgroup").span; document.getElementById("demo").innerHTML = x; } </script> </body> </html>