abstract：<!DOCTYPE html><html><head><meta charset="utf-8"><title>start</title><style>body {background-color:tan;}h1 {color:maroon;font-size:20pt;
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>start</title>
<style>
body {background-color:tan;}
h1 {color:maroon;font-size:20pt;text-align:center;}
hr {color:white;}
p {font-size:11pt;margin-left:50px;}
a:link {color:green;}<!--点击变色-->
a:visited {color:yellow;}
a:hover {color:black;}
a:active {color:blue;}
</style>
</head>
<body>
<h1>这是标题</h1>
<hr> <!-- 直线 -->
<p>你可以看到这个段落是
</p>
<p><a href="" >这是一个链接</a></p>
</body>
</html>