1、一个网页,也就是一个XHTML文档,是由元素组成。元素定义了文本和图形在XHTML文档中的结构。XHTML文档的扩展名通常是.html或者htm。
2、XHTML元素使用XHTML标记定义,每个标记都出现在一对尖括号中,标记通常成对出现。第一个标记定义了标记的起点,称为“开始标记”;第二个标记定义了标记的结尾,称为“结束标记”。在开始标记和结束标记之间的文本称为元素内容。
3、标记具有属性,属性提供了关于页面上XHTM元素的附加信息。
4、XHTML文档的总体结构由、
、这三个文档级的标记构成。5、XHTML包含了几个块级的标记来限定和格式化段落文本。这些标记包括:
,
到,,,
,
,, 6、创建超链接的XHTML标记为 href=URL或者锚点的名称,target=_blank,_parent,_self,_top创建空白、父级、本窗口、顶层的窗口 name=name href=”#name”就可以回到之前锚点定义的位置
7、创建图形信息的XHTML标记为
(自闭合标记)
8、创建多媒体信息的XHTML标记为
9、创建表格信息的XHTML标记为
10、XHTML元素分为块级元素和内嵌元素两种类型,二者的不同之处在于块级元素定义的文本是换行的,而内嵌元素定义的文本是不换行的。
- 首字母缩写
- 地址
-
换行 - 和粗体显示
- 整块斜体显示 强调
- 某个词斜体显示 不同
- 高亮强调
- 文本显示方向,默认从左到右显示。
删除,中间有一横线 - 插入,配合del使用
定义预编排格式
定义一个短的引用
- 下划线(已过时)
根据HTML5的规范,标签应作为最后的选择,只有在没有其他标记比较合适的时候才修改。
,,,
,
,
6、创建超链接的XHTML标记为 href=URL或者锚点的名称,target=_blank,_parent,_self,_top创建空白、父级、本窗口、顶层的窗口 name=name href=”#name”就可以回到之前锚点定义的位置
7、创建图形信息的XHTML标记为
(自闭合标记)
8、创建多媒体信息的XHTML标记为
9、创建表格信息的XHTML标记为
10、XHTML元素分为块级元素和内嵌元素两种类型,二者的不同之处在于块级元素定义的文本是换行的,而内嵌元素定义的文本是不换行的。
- 首字母缩写
- 地址
换行- 和粗体显示
- 整块斜体显示 强调
- 某个词斜体显示 不同
- 高亮强调
- 文本显示方向,默认从左到右显示。
删除,中间有一横线- 插入,配合del使用
定义预编排格式 定义一个短的引用- 下划线(已过时)
根据HTML5的规范,标签应作为最后的选择,只有在没有其他标记比较合适的时候才修改。

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.


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