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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } table { width: 100%; } </style> </head> <body> <h1>全宽表格</h1> <table> <tr> <th>Firstname</th> <th>Lastname</th> </tr> <tr> <td>Bill</td> <td>Gates</td> </tr> <tr> <td>Steve</td> <td>Jobs</td> </tr> </table> </body> </html>