html运行实例（eg_csse_selector_class

代码示例：（标识：eg_csse_selector_class_1）

<html>
<head>
<style type="text/css">
.important {color:red;}
</style>
</head>

<body>
<h1 class="important">This heading is very important.</h1>

<p class="important">This paragraph is very important.</p>

<p>This is a paragraph.</p>

<p>This is a paragraph.</p>

<p>This is a paragraph.</p>

<p>...</p>
</body>
</html>