html运行实例（css_sel_attribute_hyphen）-搜寻教程库

代码示例：（标识：css_sel_attribute_hyphen）

<!DOCTYPE html>
<html>
<head>
<style>
[class|=top] {
  background: yellow;
}
</style>
</head>
<body>

<h1>CSS [attribute|="value"] 选择器</h1>

<h1 class="top-header">Welcome</h1>
<p class="top-text">Hello world!</p>
<p class="topcontent">Are you learning CSS?</p>

</body>
</html>