HTML（Hypertext Markup Language），即超文本标记语言，是一种用于创建网页的标准语言。HTML中有两个重要的概念，分别是属性和标签。
属性是HTML标签的特征，用来定义HTML元素的特定性质。例：class属性是元素的类名，用于定义样式；id属性用于为元素定义唯一的标识符。
标签是HTML文档中的关键元素，用来指示文本如何显示在浏览器中。HTML标签包含两个部分，即起始标签和结束标签，中间是标签内的内容。例：`
`是一个段落标签，`
`是该段落标签的结束标签。
HTML标签有很多种类，其中一些比较常见的标签如下：
1. ``：定义HTML文档
2. `
`：定义文档的头部，包含文档的元信息和其他头部元素
3. `
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