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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } </style> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "//hm.baidu.com/hm.js?73c27e26f610eb3c9f3feb0c75b03925"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> </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> </body> </html>
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