pre tag_html/css_WEB-ITnose
pre
pre 元素可定义预格式化的文本。被包围在 pre 元素中的文本通常会保留空格和换行符。而文本也会呈现为等宽字体。
pre标签的一个常见应用就是用来表示计算机的源代码。
可以导致段落断开的标签（例如标题、p 和 address 标签）绝不能包含在 pre所定义的块里。尽管有些浏览器会把段落结束标签解释为简单地换行，但是这种行为在所有浏览器上并不都是一样的。
pre 元素中允许的文本可以包括物理样式和基于内容的样式变化，还有链接、图像和水平分隔线。当把其他标签（比如 a标签）放到 pre 块中时，就像放在 HTML/XHTML 文档的其他部分中一样即可。请看下面的例子：
<pre class="brush:php;toolbar:false"><html><head><script type="text/javascript" src="loadxmldoc.js"></script></head><body><script type="text/javascript">xmlDoc=<a href="dom_loadxmldoc.asp">loadXMLDoc</a>("books.xml");document.write("xmlDoc is loaded, ready for use");</script></body></html>
在上面的代码中，pre 标签中的特殊符号被转换为符号实体，比如 "<" 代表 "<"，">" 代表 ">"。另外，请注意蓝色的代码，我们在pre 标签中使用了链接，也就是 a标签。上面这段代码的显示效果如下：
<html><head><script type="text/javascript" src="loadxmldoc.js"></script></head><body><script type="text/javascript">xmlDoc=loadXMLDoc("books.xml");document.write("xmlDoc is loaded, ready for use"); </script></body></html>HTML pre 标签
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