2-17编程练习

来源：2-17 编程练习

慕粉1110144175

2019-01-31 13:29:28

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>动态伪类</title>
        <style type="text/css">
            /*此处写代码*/
           input:hover{
              border-color:red; 
           }
           .username:focus{
               background:orange;
           }
           .password:focus{
               background:yellow;
           }
        </style>
    </head>
    <body>
        <!-- 此处写代码 -->
        用户名：<input type="text" class="username"/>
        <br/>
        密码：<input type="password" class="password"/>
    </body>
</html>

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