The role of css: 1. It can save a lot of time; 2. CSS provides a simple way to update the format of the document and maintain consistency between multiple documents, making maintenance simple and easy. ; 3. Faster page loading speed; 4. Advanced styles of HTML; 5. Multi-device compatibility.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
What is CSS?
CSS refers to Cascading Style Sheets
Style defines how to display HTML elements
Styles are usually stored in style sheets
Styles are added to HTML 4.0 to solve the problem of separation of content and presentation
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External style sheets can greatly improve work efficiency
External style sheets are usually stored in CSS files
Multiple style definitions can Cascading into a
Function of css
1. CSS saves a lot of time
CSS provides for setting the style attributes of elements A lot of flexibility. You write CSS once; the same code can then be applied to groups of HTML elements or reused across multiple HTML pages.
2. Easy to maintain
CSS provides a simple way to update the format of a document and maintain consistency between multiple documents. Because the content of an entire set of web pages can be easily controlled using one or more style sheets.
3. Pages load faster
CSS enables multiple pages to share formatting information, thereby reducing the complexity and duplication of document structure content. It significantly reduces the size of file transfers, resulting in faster page loads.
4. Advanced styles of HTML
CSS has a wider range of representation capabilities than HTML and provides better control over the layout of web pages. Therefore, you can get a better view of your web page than the HTML representation of elements and attributes.
5. Multi-device compatibility
CSS also allows web pages to be optimized for multiple devices or media. Using CSS, the same HTML document can be represented in different viewing styles for different rendering devices (such as desktop, mobile phones, etc.).
(Learning video sharing: css video tutorial)
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