html文件标记有定义标题的title标签，定义基准的文字字体，字号颜色的basefont标签，设置外部链接的link标签，定义脚本的script标签等
头部标记
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：设定基准的文字字体、字号和颜色
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<p><isindex>： 表明该文档是一个可用于检索的网关脚本，由服务器自动建立</p>
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<p id="标题标记title"><strong>标题标记<title></strong></p>
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<p id="源信息标记meta"><strong>源信息标记<meta></strong></p>
<p>设置页面关键字 </p>
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