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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; border-collapse: collapse; } th, td { padding: 15px; text-align: left; } #t01 { width: 100%; background-color: #f1f1c1; } </style> </head> <body> <h2>设置表格样式</h2> <table style="width:100%"> <tr> <th>Firstname</th> <th>Lastname</th> <th>Age</th> </tr> <tr> <td>Jill</td> <td>Smith</td> <td>50</td> </tr> <tr> <td>Eve</td> <td>Jackson</td> <td>94</td> </tr> <tr> <td>John</td> <td>Doe</td> <td>80</td> </tr> </table> <br> <table id="t01"> <tr> <th>Firstname</th> <th>Lastname</th> <th>Age</th> </tr> <tr> <td>Jill</td> <td>Smith</td> <td>50</td> </tr> <tr> <td>Eve</td> <td>Jackson</td> <td>94</td> </tr> <tr> <td>John</td> <td>Doe</td> <td>80</td> </tr> </table> </body> </html>