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                            <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>表单实战</title> </head> <body> <form action="demo.html" method="get"> <table align="center" width="400" bgcolor="powderblue"> <h1 align="center">提交表单</h1> <tr> <td> <label for="name">邮箱:</label></td> <td><input type="text" name="name" value="" id="name" placeholder="1652786790"></td> </tr> <tr> <td> <label for="name1"> 密码: </label> </td> <td><input type="text" name="name1" id="name1" value="" placeholder="请输入你的密码?"> </td> </tr> <tr> <td><label for="name2">性别:</label> </td> <td> <!-- 取决于name2的值相等 --> <input type="radio" name="name2">男 <input type="radio" name="name2">女 <input type="radio" name="name2" checked="">保密 <!-- checked设置默认选项 --> </td> </tr> <tr> <td><lable for="name3">兴趣: </lable> </td> <td> <input type="checkbox" name="name3">html <input type="checkbox" name="name3">css <input type="checkbox" name="name3" checked="">javacsript </td> </tr> <tr> <td> <label>级别: </label> </td> <td> <select> <option> html </option> <option selected=""> css </option> <!-- selected=""设置显示谁 --> <option> javascript </option> <option>jquery </option> </select> </td> </tr> <tr> <td> <lable>头像: </lable> </td> <td> <img src="" alt=""> <input type="file" name=""> </td> </tr> <tr> <td><lable> 简介: </lable></td> <td> <textarea name="name5" placeholder="请输入内容"></textarea> </td> </tr> <tr> <td colspan="2" align="center"> <hr> <input type="submit" name="" value="提交表单"> <input type="reset" name="" value="重置"> </td> </tr> </table> </form> </body> </html>
点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>样式继承</title>
</head>
<body>
<style type="text/css" media="screen">
body{
   font-size:20px;
}
ul{
    font-weight:bold;
    border:1px solid #f30;
    padding:20rem;
}
ul li{
    border:inherit;
    padding:inherit;  /* //继承样式 */
}
</style>
<ul>
    <li> 样式继承 </li>
    <li> 导航菜单 </li>
</ul>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>常用选择器</title>
</head>
<style type="text/css" media="screen">
ul,li{
    list-style:none;
}
ul:after{
   content:"";
   display:block;
   clear:both;
}
ul li{
     float: left;
     width:30px;
     height:30px;
     border-radius:50%;
     background:#f30;
     text-align:center;
     line-height:30px;
     color:#eee;
     margin-left:5px;
}
#item1{
    background:blue;
}
.item1{
    background:gold;
}
ul li[class]{
    background:blueviolet;
}
/* ul li[class^="gov"] {
        background-color:grey;
 }
 */
ul li[class$="box"] {
            background-color: #666;
        }
ul li[class*="te"]{
      background:#000;
}
/* ul li:first-child{
    background:#333!important;
} */
ul li:last-child{
    background:#333;
}
/* ul li:nth-child(2n+1){
    background:#888;
} */
ul li:nth-child(2n){
    background:#888;
}
        /*伪类选择器: 根据子元素数量*/
        /*选择具有唯一子元素的元素*/
 ol :only-child {
            background-color: lawngreen;
}
ol li:only-child{
}
ol li:nth-of-type(2){
    background:#999;
}
 :empty {
            width: 220px;
            height: 271px;
            background-color: coral;
        }
:empty:after{
    content:"看到我了吗?";
}
:empty:before{
    content:"url('')";
}
</style>
<body>
<!-- 总结排序:!important > 行内样式>ID选择器 > 类选择器 > 标签 > 通配符 > 继承 > 浏览器默认属性
同一级别 -->
<ul>
    <li id="item1">1</li>
    <li class="item1">2</li>
    <li class="gov pin box te">3</li>
    <li>4</li>
    <li>5</li>
    <li>6</li>
    <li>7</li>
    <li>8</li>
</ul>
<ol>
    <li>1</li>
</ol>
<ol>
    <li>2</li>
    <li>3</li>
</ol>
<ol>
    <li>4</li>
    <li>5</li>
    <li>6</li>
</ol>
<div></div>
</body>
</html>点击 "运行实例" 按钮查看在线实例

总结:
:empty 选择页面中内容为空的元素 :empty:after插入内容
:first-child 选择第一个元素 :last-child 选择最后一个
[class$="pig"] + li 相邻兄弟选择器
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