代码示例：（标识：cssref_default_blockquote）
<!DOCTYPE html>
<html>
<head>
<style>
/* 默认的 CSS 值 */
blockquote {
display: block;
margin-top: 1em;
margin-bottom: 1em;
margin-left: 40px;
margin-right: 40px;
}
</style>
</head>
<body>
<p>默认情况下，blockquote 元素会这样显示：</p>
<blockquote cite="http://www.worldwildlife.org/who/index.html">
For 50 years, WWF has been protecting the future of nature. The world's leading conservation organization, WWF works in 100 countries and is supported by 1.2 million members in the United States and close to 5 million globally.
</blockquote>
<p>自定义的 blockquote 元素（更改 margin）：</p>
<blockquote cite="http://www.worldwildlife.org/who/index.html" style="margin:100px;">
For 50 years, WWF has been protecting the future of nature. The world's leading conservation organization, WWF works in 100 countries and is supported by 1.2 million members in the United States and close to 5 million globally.
</blockquote>
</body>
</html>
