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<!DOCTYPE html> <html> <head> <style> table { border-collapse: collapse; width: 100%; } th, td { padding: 8px; text-align: left; border-bottom: 1px solid #ddd; } </style> </head> <body> <h1>表格分隔线</h1> <p>为 th 和 td 添加 border-bottom，已实现水平分隔线：</p> <table> <tr> <th>Firstname</th> <th>Lastname</th> <th>Savings</th> </tr> <tr> <td>Bill</td> <td>Gates</td> <td>$100</td> </tr> <tr> <td>Steve</td> <td>Jobs</td> <td>$150</td> </tr> <tr> <td>Elon</td> <td>Musk</td> <td>$300</td> </tr> <tr> <td>Mark</td> <td>Zuckerberg</td> <td>$250</td> </tr> </table> </body> </html>