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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } </style> </head> <body> <h1>col 元素</h1> <table> <colgroup> <col span="2" style="background-color:red"> <col style="background-color:yellow"> </colgroup> <tr> <th>ISBN</th> <th>书目</th> <th>价格</th> </tr> <tr> <td>3476896</td> <td>HTML 入门</td> <td>$39</td> </tr> <tr> <td>5869207</td> <td>CSS 入门</td> <td>$27</td> </tr> </table> </body> </html>