html5基础：
1 声明:<!DOCTYPE html>
2 基本的结构:
<html>
<head>
<meta charset="utf-8" >
<title>html基础.</title>
</head>
<body>
php就业网:www.php91.net.
</body>
</html>
3 标题:
<h1>标题1</h1>
<h2>标题2</h2>
...
<h6>标题6</h6>
4 段落
<p></p>
5 <a href="http://www.php91.net/" >php就业网</a>