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html

<!DOCTYPE html>
<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">
    <link rel="stylesheet" href="css/userForm.css" />
    <title>用户注册表单</title>
</head>
<body>
   <h1>用户注册表单</h1>
    <h3>注意事项</h3>
    <ul>
        <li>提交前检查</li>
        <li class="start">有问题练习123456</li>
        <li>网站邮箱：111@163.com</li>
    </ul>
   <form action="" method="get">
    <div>
        <label for="">搜索</label>
        <input type="search" name="search" list="showList"/>
        <datalist id="showList">
            <option value="1"></option>
            <option value="2"></option>
            <option value="3"></option>
        </datalist>
    </div>
    <fieldset class="must">
        <legend>必填项</legend>
        <div>
            <label for="username">用户名：</label>
            <input type="text" name="username" id="username" autofocus required placeholder="请输入不超过8位数">
        </div>
        <div>
             <label for="password">密码：</label>
             <input type="password" name="password" id="password" required placeholder="请输入大写字母或小写字母">
        </div>
        <div>
             <label for="email">邮箱：</label>
             <input type="email" name="email" id="email" required placeholder="example@email.com">
        </div>
    </fieldset>
    <fieldset class="choose">
        <legend>问卷调查（选填项）</legend>
        <div>
            <label for="male">性别：</label>
            <input type="radio" name="gender" value="male" id="male" checked><label for="">男</label>
            <input type="radio" name="gender" value="female" id="female"><label for="">女</label>
        </div>
        <div>
            <label for="">从哪些渠道获取本网站信息：</label>
            <input type="checkbox" name="route[]" id="internet"><label for="internet">网络</label>
            <input type="checkbox" name="route[]" id="magzine" class="start"><label for="magzine">报纸杂志</label>
            <input type="checkbox" name="route[]" id="friends"><label for="friends">朋友介绍</label>
        </div>
        <div>
            <label for="">年龄段</label>
            <select name="age" id="age">
                <option value="1">18岁以下</option>
                <option value="2" selected>18-30岁</option>
                <option value="3">30岁以上</option>
            </select>
        </div>
    </fieldset>
    <div>
        <button type="submit">提交表单</button>
    </div>
   </form> 
</body>
</html>

css

/* 基本选择器 */
h1 {
    text-align: center
}
h3 {
    background-color: violet;
    text-align: center
}
fieldset.must{
    background-color: rgb(130, 225, 238);
    text-align: center
}
fieldset.choose{
    background-color: rgb(231, 238, 130);
    text-align: center
}
/* 上下文选择器 */
ul li {
    background-color: lightblue;
}
.start + li {
    background-color: yellow;
}

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