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HTML,全称HyperText Markup Language,即超文本标记语言,是用于创建网页的标准标记语言。HTML文件由一系列元素组成,这些元素通过标签定义,告诉浏览器如何呈现内容。它与CSS(层叠样式表)和JavaScript一起,构成了网页开发的基础。 在HTML中,每个元素都由开始标签和结束标签构成,例如`<p>`和`</p>`代表一个段落。开始标签用尖括号包围,而结束标签则多了一个斜杠。一些元素如`<img>`,只需要开始标签,因为它们没有内容,被称为自闭合标签。 HTML5是HTML的最新版本,它引入了许多新的功能和改进,如更好的多媒体支持(`<audio>`和`<video>`标签)、离线存储(`applicationCache`)、图形绘制(`canvas`标签)以及数据存储(`localStorage`和`sessionStorage`)。这些特性使开发者能创建更丰富、交互性更强的网页。 HTML文档的基本结构包括`<!DOCTYPE html>`声明,它告诉浏览器使用哪个HTML版本。接着是`<html>`元素,它是整个文档的根元素,包含了`<head>`和`<body>`两个主要部分。`<head>`包含元信息,如页面标题(`<title>`),字符编码(`<meta charset="UTF-8">`),以及引用外部资源(如CSS和JavaScript文件)。`<body>`则包含网页的实际内容,如文字、图片、链接等。 在HTML中,我们可以使用`<a>`标签创建链接,`<img>`插入图片,`<h1>`到`<h6>`定义不同级别的标题,`<ul>`和`<li>`创建无序列表,`<ol>`和`<li>`创建有序列表。`<div>`元素常用于组合其他元素,进行布局控制,而`<span>`用于对行内元素进行样式操作。 表格由`<table>`、`<tr>`(行)、`<th>`(表头单元格)和`<td>`(普通数据单元格)组成。表单元素,如`<form>`、`<input>`、`<textarea>`和`<button>`,用于用户交互和数据提交。 HTML还支持多种属性,如`class`用于CSS选择器,`id`用于唯一标识元素,`href`指定链接的目标,`src`指明媒体文件的位置。通过这些属性,可以实现更精细的控制和样式化。 总的来说,HTML是构建网页内容的核心工具,它的语法简单易学,但功能强大。无论你是初学者还是经验丰富的开发者,理解并掌握HTML都是至关重要的。通过熟练运用HTML,你可以创建出各种各样的网页,满足不同需求和设计。
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