Three forms: 1. Write the style in the style attribute of the tag, the syntax is "
"; 2. Write the style in the style tag pair, the syntax is "< ;style>code”; 3. Put the css code into the “.css” file and introduce it using the link tag.
The operating environment of this tutorial: Windows7 system, CSS3&&HTML5 version, Dell G3 computer.
1. Inline style
sets the style of the element through the style attribute of the tag. Its basic syntax format is as follows:
<element style="属性:值;属性:值;...">内容</element>
style in syntax It is an attribute of the tag. In fact, any HTML tag has the style attribute, which is used to set the inline style. The writing specification of the attribute value is the same as the CSS style rule. The inline style works on all its tags and the subtags nested in it. .
2. Internal style sheet
Embedded style is to write the css code in the head tag of the HTML document and define it with the style tag. Its basic The syntax format is as follows:
<head>
<style type="text/css">
css选择器{
属性:值;
属性:值;
}
</style>
</head>In syntax, the style tag is generally located after the head tag, and it can also be placed anywhere in the HTML document.
3. External link style
The linked style is to place all styles in one or more external style sheet files with CSS as the extension. The link tag links external styles to the HTML document. Its basic syntax format is as follows:
<link rel="stylesheet" type="text/css" href="css文件路径" />
| Attribute | Description |
|---|---|
| rel | Define the relationship between the current document and other linked documents. "stylesheet" means: the linked document is a style sheet file |
| href | Define the URL of the linked external style sheet file, which can be a relative path or an absolute path |
Advantages:
Complete separation of structure and performance code
Facilitates reuse and maintenance
Because Separating into separate files greatly reduces the size of HTML files, making the page structure easier to read by programmers and web crawlers
Friendly to search engines, making search engines Give the page a higher score, which is beneficial to the page's search engine ranking
The external style sheet is cached on the user's computer after the user's first visit, and does not need to be loaded on the next visit
Disadvantages:
If there are many styles, the CSS file will become very large and difficult to find. In addition, one more CSS file means one more HTTP request, which will increase the pressure on the server on a website with a large number of visits
(Learning video sharing: css video tutorial)
The above is the detailed content of What are the three main forms of using css on the page?. For more information, please follow other related articles on the PHP Chinese website!
HTML and React's Integration: A Practical GuideApr 21, 2025 am 12:16 AMHTML and React can be seamlessly integrated through JSX to build an efficient user interface. 1) Embed HTML elements using JSX, 2) Optimize rendering performance using virtual DOM, 3) Manage and render HTML structures through componentization. This integration method is not only intuitive, but also improves application performance.
React and HTML: Rendering Data and Handling EventsApr 20, 2025 am 12:21 AMReact efficiently renders data through state and props, and handles user events through the synthesis event system. 1) Use useState to manage state, such as the counter example. 2) Event processing is implemented by adding functions in JSX, such as button clicks. 3) The key attribute is required to render the list, such as the TodoList component. 4) For form processing, useState and e.preventDefault(), such as Form components.
The Backend Connection: How React Interacts with ServersApr 20, 2025 am 12:19 AMReact interacts with the server through HTTP requests to obtain, send, update and delete data. 1) User operation triggers events, 2) Initiate HTTP requests, 3) Process server responses, 4) Update component status and re-render.
React: Focusing on the User Interface (Frontend)Apr 20, 2025 am 12:18 AMReact is a JavaScript library for building user interfaces that improves efficiency through component development and virtual DOM. 1. Components and JSX: Use JSX syntax to define components to enhance code intuitiveness and quality. 2. Virtual DOM and Rendering: Optimize rendering performance through virtual DOM and diff algorithms. 3. State management and Hooks: Hooks such as useState and useEffect simplify state management and side effects handling. 4. Example of usage: From basic forms to advanced global state management, use the ContextAPI. 5. Common errors and debugging: Avoid improper state management and component update problems, and use ReactDevTools to debug. 6. Performance optimization and optimality
React's Role: Frontend or Backend? Clarifying the DistinctionApr 20, 2025 am 12:15 AMReactisafrontendlibrary,focusedonbuildinguserinterfaces.ItmanagesUIstateandupdatesefficientlyusingavirtualDOM,andinteractswithbackendservicesviaAPIsfordatahandling,butdoesnotprocessorstoredataitself.
React in the HTML: Building Interactive User InterfacesApr 20, 2025 am 12:05 AMReact can be embedded in HTML to enhance or completely rewrite traditional HTML pages. 1) The basic steps to using React include adding a root div in HTML and rendering the React component via ReactDOM.render(). 2) More advanced applications include using useState to manage state and implement complex UI interactions such as counters and to-do lists. 3) Optimization and best practices include code segmentation, lazy loading and using React.memo and useMemo to improve performance. Through these methods, developers can leverage the power of React to build dynamic and responsive user interfaces.
React: The Foundation for Modern Frontend DevelopmentApr 19, 2025 am 12:23 AMReact is a JavaScript library for building modern front-end applications. 1. It uses componentized and virtual DOM to optimize performance. 2. Components use JSX to define, state and attributes to manage data. 3. Hooks simplify life cycle management. 4. Use ContextAPI to manage global status. 5. Common errors require debugging status updates and life cycles. 6. Optimization techniques include Memoization, code splitting and virtual scrolling.
The Future of React: Trends and Innovations in Web DevelopmentApr 19, 2025 am 12:22 AMReact's future will focus on the ultimate in component development, performance optimization and deep integration with other technology stacks. 1) React will further simplify the creation and management of components and promote the ultimate in component development. 2) Performance optimization will become the focus, especially in large applications. 3) React will be deeply integrated with technologies such as GraphQL and TypeScript to improve the development experience.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Atom editor mac version download
The most popular open source editor
Dreamweaver Mac version
Visual web development tools
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
