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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } </style> </head> <body> <h1>colgroup span 属性</h1> <table> <colgroup span="2" style="background:red"></colgroup> <tr> <th>ISBN</th> <th>Title</th> <th>Price</th> </tr> <tr> <td>3476896</td> <td>我的第一个 HTML</td> <td>$53</td> </tr> <tr> <td>5869207</td> <td>我的第一个 CSS</td> <td>$49</td> </tr> </table> </body> </html>