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【HTML基础】 HTML(HyperText Markup Language)是构建网页的标准标记语言,它构成了互联网的基础。HTML文件由一系列元素组成,这些元素通过标签来定义,比如`<html>`、`<head>`、`<body>`等。每个标签都有其特定的意义和作用,用于组织网页的结构和内容。 在HTML中,`<head>`标签包含文档的元数据,如标题(`<title>`)、字符集声明(`<meta charset="UTF-8">`)以及外部资源链接(如CSS和JavaScript)。`<body>`标签则包含了网页可见的内容,如段落(`<p>`)、标题(`<h1>`到`<h6>`)、图像(`<img>`)、超链接(`<a>`)和列表(`<ul>`和`<ol>`)等。 【HTML5新特性】 HTML5作为HTML的最新版本,引入了许多新特性以提升用户体验和开发者效率。其中包括: 1. **离线存储**:通过`<html manifest>`属性,可以缓存网页资源,实现离线访问。 2. **语义化标签**:新增了如`<header>`、`<footer>`、`<article>`、`<section>`等标签,增强了文档的可读性和可访问性。 3. **多媒体支持**:`<video>`和`<audio>`标签使得内联播放音频和视频变得简单,不再依赖Flash等插件。 4. **Canvas绘图**:`<canvas>`元素提供了在浏览器中进行动态图形绘制的能力,常用于游戏和数据可视化。 5. **SVG矢量图**:支持内联SVG图形,允许创建高质量、可缩放的图形。 6. **表单控件增强**:`<input>`元素新增了多种类型,如`email`、`date`、`range`,提供了更好的表单验证功能。 7. **Web Workers和Web Storage**:通过Web Workers实现后台处理,提高网页性能;Web Storage(包括localStorage和sessionStorage)提供更大的本地存储空间。 【HTML与CSS结合】 CSS(Cascading Style Sheets)用于控制HTML元素的样式和布局。通过将CSS与HTML分离,可以实现内容与表现的解耦,使代码更易于维护和扩展。CSS选择器用于定位HTML元素,如类选择器(`.class_name`)、ID选择器(`#id_name`)、标签选择器(`element_name`)等。常用的CSS属性包括颜色(`color`)、字体(`font-family`、`font-size`)、布局(`margin`、`padding`、`display`)和定位(`position`、`top`、`right`、`bottom`、`left`)等。 【响应式设计】 响应式设计是HTML5的一个核心概念,它允许网页根据用户设备的屏幕尺寸和方向自动调整布局。通过媒体查询(`@media`)和弹性布局(Flexbox)或网格布局(Grid),可以创建适应各种设备的网页。这样,无论是手机、平板还是桌面电脑,用户都能获得良好的浏览体验。 【总结】 HTML是构建网页的基石,HTML5的出现带来了许多增强功能,使得网页开发更加高效和灵活。通过结合CSS,我们可以实现丰富的视觉效果和精确的页面布局。随着移动设备的普及,响应式设计成为现代网页开发不可或缺的部分。理解并掌握这些知识点,对于任何想要从事Web开发的人员来说都至关重要。
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