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<html lang="en"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> </head> <body> <form action=""></form> <div> <label for="username">用户名</label> <input type="text" id="username" name="username" value="" placeholder="首字母大写" autofocus required /> </div> <div> <label for="paw">密码</label> <input type="password" id="paw" name="password" value="" placeholder="最少6位" required /> </div> <div> <label for="email">邮箱</label> <input type="me-email" id="me-email" name="email" value="" placeholder="xxx@qq.com" autofocus required /> </div> <div> <button>登录</button> </div> <h1>后台管理</h1> <div> <span>admin</span> <a href="">退出</a> </div> <ul class="nav"> <li><a href="">href=”demo1.html” targer=”content”</a>菜单项1</li> <li><a href="">href=”demo2.html” targer=”content”</a>菜单项2</li> <li><a href="">href=”demo3.html” targer=”content”</a>菜单项3</li> <li><a href="">href=”demo4.html” targer=”content”</a>菜单项4</li> <li><a href="">href=”demo5.html” targer=”content”</a>菜单项5</li> </ul> <iframe src="" frameborder="0"> name=”content”</iframe><div><h1>元素样式的来源</h1><li>代理样式</li><li>自定义样式，会覆盖代理样式</li><li>书写顺序，若优先级相同书写后面的同名属性会覆盖前面的</li></div> </body></html>
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