它的开发对象是什么？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Hello CSS3</title>
<link href='http://fonts.googleapis.com/css?family=Fruktur' rel='stylesheet' type='text/css'>
<link href="style.css" rel="stylesheet" type="text/css">
</head>
<body>
<h1>Hello CSS3</h1>
</body>
</html>
