css--引入css的3种方法
<!--1、引入css,行间样式--><div style="width: 100px; height:100px; background-color: red"></div><!--2、页面级css 在header引入css--><!--3、外部css 文件 link-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
div{
width: 100px;
height:100px;
background-color: green;
}
</style>
<link rel="stylesheet" href="a.css">
</head>
<body>
<!--1、引入css,行间样式-->
<div style="width: 100px;
height:100px;
background-color: red
"></div>
<!--2、页面级css 在header引入css-->
<!--3、外部css 文件 link-->
<div></div>
</body>
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