<html><head><style>table, th, td { border: 1px solid black; border-collapse: collapse;}th, td { padding: 15px;}</style></head><body><h2>单元格填充</h2><p>单元格填充指定单元格内容与其边框之间的空间。</p><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><p><strong>提示</strong>：尝试将内边距更改为 5 像素。</p></body></html>