这是一段代码
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<!DOCTYPE html>
<html>
<head>
<mate charest="utf-8" />
<meta name="keywords" content="Editor.md, Markdown, Editor" />
<title>Hello world!</title>
<style type="text/css">
body{font-size:14px;color:#444;font-family: "Microsoft Yahei", Tahoma, "Hiragino Sans GB", Arial;background:#fff;}
ul{list-style: none;}
img{border:none;vertical-align: middle;}
</style>
</head>
<body>
<h1 class="text-xxl">Hello world!</h1>
<p class="text-green">Plain text</p>
</body>
</html>