What are the ways to introduce css?

The ways to introduce css are: 1. Use the style attribute of the HTML tag to introduce it; 2. Write the style code in the "" tag pair on the page; 3. Use link tag to introduce external CSS files; 4. Use the "@import" rule to introduce external CSS files.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

1. Use the style attribute of the HTML tag (inline)

Add the style attribute directly to a single HTML element tag to control the presentation style of the HTML tag.

This way of introducing CSS is decentralized, flexible and convenient, but it lacks integrity and planning, which is not conducive to later modification and maintenance. When the style of the website needs to be modified, the same modification may involve multiple places. , high maintenance costs. The style effect using the STYLE attribute is the strongest and will overwrite the same style effects of other introduction methods.

2. Use the style tag (embedded)

Write the style code on the pageAmong tags

tag structure can be located anywhere in the pagetag, or can appear multiple times. Usually the entire structure is written in the...

3. Use the link tag to introduce external CSS files (linked)

Write the css code in a separate file and use the link tag to directly introduce the file to the page. A page can use the LINK tag multiple times to introduce multiple external CSS files. Pay attention to the mutual influence of these CSS codes. Usually, the CSS files introduced later will overwrite the same effects of the CSS files introduced earlier. This method of introducing CSS is currently the most popular. CSS codes can be planned within the scope of each website to facilitate reuse and maintenance. However, this highly centralizes the code, and the amount of code may be too large, and it is easy to cause problems if it is not properly maintained. confusion.

4. Use @import to introduce CSS files (import type)

There are two ways to use @import to introduce CSS files, one can be placed on the page, the usage is as follows:

@import url(index2.css);

It can also be used in a CSS file, the usage is as follows:

@import "sub.css";

You can use @import to introduce CSS It is very convenient to introduce CSS code from external files for maintenance and planning. However, every time an additional CSS file is introduced, a connection request will be added to the server. When the number of visits is large, a trade-off needs to be made between maintainability and performance. (Learning video sharing:css video tutorial)

The difference between link type and import type

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2, Prioritizes loading CSS files to the page

@import

2. Load the HTML structure first and then load the CSS file.

Priority in CSS

       
   
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我是p段落
 
我是p
 
 
1111
 
2222
 
 

         
  
我是p段落
 
我是p
 
 
1111
 
2222
 
 

      
  
111
  
222
  
333
 

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