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1. 注释
HTML中的注释和其它语言注释作用相似，都是为了方便阅读和调试代码。当浏览器遇到注释时会自动忽略注释内容。HTML的注释格式多行和单行注释都用一种格式，如下：
当页面HTML结构复杂或内容较多时，需要添加必要的注释来方便阅读和维护代码。同时，有时候为了调试代码，需要暂时注释掉一些不必要的代码，方便调试。
代码规范：需要注意的是，XHTML 1.0标准规定不要在注释中在出现双横线"--".
不规范的注释：
规范的注释：
2. 保留字符
因为大于号（>）小于号（
常用的特殊符号和对应的字符实体表，这些字符实体都是以"&"开头，以英文分号"；"结束。
特殊符号 字符实体
空格
大于号（>） >
小于号（
引号（"） "
版权符号（?） ©
（&） &
文章来源:html保留字符详解
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