URI (Universal Resource Identifier) usually consists of three parts: ①The naming mechanism for accessing resources; ②The host name where the resource is stored; ③The name of the resource itself, represented by the path. Such as the following URI: http://www.webmonkey.com.cn/html/html40/
Three parts of the URL format: The first part is the protocol (or service method).
The second part is the IP address of the host where the resource is stored (sometimes including the port number
wealthgeneShe\ `\"The third part is the specific address of the host resource, such as directory and file name, etc.
The first part and the second part are separated by the "://" symbol, and the second part and the third part are separated by the "/" symbol. The first and second parts are indispensable, and the third part can sometimes be omitted.
Example: 1.URl example of http protocol: http://www.peopledaily.com.cn/channel/welcome.htm The computer domain name is www.peopledaily.com.cn. The hypertext file (file type: .html) is welcome.htm in the directory /channel. This is a computer from the People's Daily of China.
2. URL in file form
When using URL to represent a file, the server mode is represented by file, followed by the host IP address, file access path (i.e. directory) and file name and other information. Directory and file names can sometimes be omitted, but the "/" symbol cannot be omitted. Example: file://ftp.yoyodyne.com/pub/files/foobar.txt. The above URL represents a file stored in the pub/files/ directory on the host ftp.yoyodyne.com, and the file name is foobar.txt. Example: file://ftp.yoyodyne.com/pub represents the directory /pub on the host ftp.yoyodyne.com. Example: file://ftp.yoyodyne.com/ represents the root directory of the host ftp.yoyodyne.com.

Self-closingtagsinHTMLandXMLaretagsthatclosethemselveswithoutneedingaseparateclosingtag,simplifyingmarkupstructureandenhancingcodingefficiency.1)TheyareessentialinXMLforelementswithoutcontent,ensuringwell-formeddocuments.2)InHTML5,usageisflexiblebutr

To build a website with powerful functions and good user experience, HTML alone is not enough. The following technology is also required: JavaScript gives web page dynamic and interactiveness, and real-time changes are achieved by operating DOM. CSS is responsible for the style and layout of the web page to improve aesthetics and user experience. Modern frameworks and libraries such as React, Vue.js and Angular improve development efficiency and code organization structure.

Boolean attributes are special attributes in HTML that are activated without a value. 1. The Boolean attribute controls the behavior of the element by whether it exists or not, such as disabled disable the input box. 2.Their working principle is to change element behavior according to the existence of attributes when the browser parses. 3. The basic usage is to directly add attributes, and the advanced usage can be dynamically controlled through JavaScript. 4. Common mistakes are mistakenly thinking that values need to be set, and the correct writing method should be concise. 5. The best practice is to keep the code concise and use Boolean properties reasonably to optimize web page performance and user experience.

HTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.

HTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

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.


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