<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>标签选择器</title>
<style>
<!--标签选择器 -->
#header {
background-color:black;
color:white;
text-align:center;
padding:5px;
}
#nav {
line-height:30px;
background-color:#eeeeee;
height:300px;
width:100px;
float:left;
padding:5px;
}
#section {
width:350px;
float:left;
padding:10px;
}
#footer {
background-color:black;
color:white;
clear:both;
text-align:center;
padding:5px;
}
#main1{
background: aquamarine;
}
/*类选择器 */
.mywords{
background: antiquewhite;
}
/*并列选择器 逻辑或的关系*/
#header, .mywords{
background: #ff5b8b;
}
/*复合选择器 逻辑与*/
p.mywords{
background: aqua;
}
/*后代选择器 包含关系 包含的所有*/
div p{
color:saddlebrown;
}
/*直接后代选择器*/
div > p{
color: palevioletred;
}
/*相邻兄弟选择器 设置的是p div下相邻的p*/
div + p {
color: #1d21ff;
}
/*属性选择器 可以多个属性p[name][name2] 指定选择 p[name='jack'] */
p[name]{
color: palevioletred;
}
/*伪类选择器 当光标闪烁的时候*/
input:focus{
width: 300px;
}
/*当鼠标点击的时候*/
input:hover{
background:salmon;
}
</style>
</head>
<body>
<div id="header">
<h1>City Gallery</h1>
</div>
<div id="nav">
London<br>
Paris<br>
Tokyo<br>
</div>
<div id="section">
<h1>London</h1>
<p class="mywords">
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</p>
<p id="main1">
Standing on the River Thames, London has been a major settlement for two millennia,
its history going back to its founding by the Romans, who named it Londinium.
</p>
</div>
<p name ="jack">div相邻的p标签</p>
<div id="footer">
Copyright W3School.com.cn
</div>
<input placeholder="我是输入框">
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>选择器优先级</title>
<style>
/*通配符 优先级最低 性能较差*/
/*规则 相同类型就近原则和叠加原则 important(最高级)>id>类选择器>标签 id为唯一标签*/
*{
font-size: 23px;
}
div{
color: salmon;
}
.jj{
background: #80fa87;
}
.oo{
background: #de61fa;
}
</style>
</head>
<body>
<div class="jj oo">我是测试优先级的</div>
</body>
</html>
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