1. HTML（Hypertext Markup Language）文件是一种基于标记语言的文件，用于创建网页和其他在线文档。
2. HTML文件以DOCTYPE声明开头，用于指定HTML文档的版本和DTD（文档类型定义）。
3. 具体来说，HTML5文件应以开头，该声明告诉浏览器文档遵循HTML5规范。
4. 除DOCTYPE声明外，HTML文件通常需要包含一些元数据，例如字符编码，文档标题和其它语义信息。这些元数据可以通过标签和
元素在HTML文件中定义。
5. 元素用于定义HTML文档的根元素，并通过lang属性指定文档的语言。
6.
元素用于定义文档的头部，其中可以包含
元素用于指定文档标题，<style>元素用于定义CSS样式，<script>元素用于指定JavaScript代码等。</p><p>7. <body>元素用于定义文档的主体部分，包括文本，图像，链接和其他所有可见内容。</p><p>8. 最后，HTML文件应以</html>结束。</p>
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