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This article mainly explains "what is the concept of separation of structure, style and behavior of CSS". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the concept of separation of structure, style and behavior of CSS".

What is the separation of structure, style and behavior? What are the benefits of this?

The core idea of web standard is structure standard, style standard and behavior standard, which advocates the separation of structure, performance and behavior, that is, the separation of HTML- structure, CSS- performance and JavaScript- behavior.

The HTML tag gives meaning to the content, the CSS presentation layer defines how the HTML should be displayed (appearance), and the JavaScript behavior becomes the page to add interaction.

For example, if a web page is a tree, HTML is responsible for the trunk, CSS is responsible for branches, leaves, flowers, fruit, etc., and JavaScript is responsible for external conditions, such as wind, rain, sunshine, etc. This helps to think about the semantic structure of the document, making it easier to maintain and change.

What is semantics? Why should it be semantic?

Semantics refers to the reasonable use of HTML tags and its unique attributes to format the content of the document, write the HTML code, in line with the structure of the content (content semantics), select the appropriate tag (code semantics), can facilitate developers to read and write more elegant code while allowing browser crawlers and machines to parse well. To put it simply, it means that the machine can read the content.

Semantics is conducive to SEO, help search engine crawlers better understand our web page, thus obtain more effective information, enhance web page weight; help to clearly see the web page structure and enhance readability; facilitate team development and maintenance; support multi-terminal device browser rendering.

What is CSS? What are its characteristics?

CSS (Cascading Style Sheets) cascading style sheets / cascading style sheets is a computer language used to represent file styles such as HTML or XML.

With rich style definitions, you can control the appearance of web pages; you can update the styles of multiple web pages at the same time, making it easy to use and modify; completely separate the presentation layer and structure layer of the web page; reduce the file size of the web page and speed up the loading speed of the web page.

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