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This article focuses on "what is the role of external css stylesheets", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let the editor take you to learn "what is the function of external css stylesheets"?

External css stylesheet role: 1, so that the style and html separation, to achieve a complete separation of the structure and performance of the code; 2, to facilitate reuse and maintenance, reducing the workload; 3, to reduce file size, so that the page structure is easier to read by programmers and web crawlers; 4, save network traffic and bandwidth; 5, reduce rendering time; 6, conducive to search rankings.

The operating environment of this tutorial: windows7 system, CSS3 version, Dell G3 computer.

If a CSS style is placed in a file outside a web page document, it is called an external style sheet, and an CSS style sheet document represents an external style sheet.

In fact, an external stylesheet is just a text file with a .css extension. When the CSS style code is copied into a text file and saved as a .css file, it is an external style sheet. For example, the following figure:

What external css stylesheets do:

The style is separated from the html, and the structure is completely separated from the performance code.

Convenient reuse and maintenance, reducing the workload. Because as long as you modify the css stylesheet file, you can change a lot of web pages, and even change the style and characteristics of the entire site. Avoid modifying web pages one by one.

Because it is separated into separate files, the size of the HTML file is greatly reduced, thus making the page structure easier for programmers and web crawlers to understand

The written code file is more concise (easy for others to read) and the file size is smaller.

When code files are transferred, network traffic and bandwidth can be saved. (because the file is smaller and duplicate css styles are stored in the cache)

When code files are rendered, rendering time can be reduced. (because the file is smaller)

Be friendly to the search engine and let the search engine score the page higher, which is beneficial to the ranking of the page search engine.

The external stylesheet is cached on the user's computer after the user's first visit, and there is no need to load the next visit

At this point, I believe that you have a deeper understanding of "what is the role of external css stylesheets", you might as well do it in practice! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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