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trycss_default_colgroup
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<!DOCTYPE html> <html> <head> <style> /* Default CSS Values */ table, th, td { border: 1px solid black; } colgroup { display: table-column-group; } </style> </head> <body> <p>Look how the colgroup element is displayed below:</p> <table> <colgroup> <col 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>Change the default CSS settings to see the effect.</p> </body> </html>