菜鸟教程在线编辑器

AI 编程工具

 
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(runoob.com)</title> 
<style> 
p:empty
{
	width:100px;
	height:20px;
	background:#ff0000;
}
</style>
</head>
<body>

<p></p>
<p>A paragraph.</p>
<p>Another paragraph.</p>

</body>
</html>
              