HTML（Hypertext Markup Language）是一种标记语言，用于构建网页的结构和内容。在HTML中，标签和其属性组成了HTML元素，它们是构建网页的基本单位。本文将详细介绍HTML标签和属性的概念，并深入探讨相关的知识和注意要点。
一、HTML标签
HTML标签是用尖括号（< >）括起来的，它们告诉浏览器如何显示网页的内容。每个HTML标签都有特定的作用和语义，用于定义不同的文档部分。以下是常用的一些HTML标签：
1. 文档类型声明标签： 用于指定HTML文档的类型。
2. ``标签：用于定义HTML文档的根元素。
3. `
`标签：包含了文档的元数据，如标题、字符编码、引入外部样式表等。
4. `
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