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<!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>
/* 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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