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Editor to share with you what are the advantages of css sprites, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Css sprites, also known as css wizard diagram, is a web page image application processing method, is a method of combining multiple images into a single image file for use on the website. Its advantages are: 1, reduce the http request of the web page, improve the loading speed of the page; 2, reduce the bytes of the picture; 3, reduce the trouble of naming; 4, change the style is convenient.

The operating environment of this tutorial: windows7 system, CSS3&&HTML5 version, Dell G3 computer.

Css sprite (Sprite)

CSS Sprites is a performance optimization technique that combines multiple images into a single image file for use on a website to improve performance; also known as css sprite.

Advantages

A) reduce the http requests of web pages and improve the loading speed of pages

B) reduce the bytes of pictures: the bytes of multiple pictures merged into one picture are less than the sum of the bytes of multiple pictures

C) reduce the trouble of naming: only need to name a picture of the collection, there is no need to name every small element to improve production efficiency

D) easy to change the style: only need to change the color or style of the picture on one or fewer pictures, the style of the whole web page can be changed and it is more convenient to maintain.

Shortcoming

A) when merging pictures, you need to merge multiple pictures into a single picture in an orderly and reasonable manner, and leave enough space to prevent unnecessary backgrounds in the plate. Fortunately, the most painful thing is the adaptive page under the wide screen and high resolution screen. If your picture is not wide enough, it is easy to break the background.

B) when setting the background, you need to get the exact location of each background unit

C) it is troublesome to maintain the composite image. If there is a slight change in the background of the page, it is generally necessary to change the merged picture. It is best to just add the picture down instead of changing the existing picture.

Why use Sprites (sprite diagram)?

A web page usually contains multiple images. These include icons, buttons, logos, related pictures and other graphics. When the image is loaded on the page, the browser issues a HTTP request to the server. Loading each image separately requires multiple calls to the HTTP server, which can result in slower download times and high bandwidth usage.

CSS Sprites combines multiple images into a single image called a spirit table or collage. Instead of downloading multiple files, the user downloads a single file and displays the necessary images (or sprite images) by offsetting the file.

This can reduce the call to the server, reduce the number of downloads required to render the web page, save bandwidth and shorten the download time of the user, and reduce network congestion.

How to use CSS Sprites (sprite diagram)?

Because CSS Sprites is a combination of multiple images into a single image, in the spirit table, multiple images will be placed in a grid pattern, showing a mesh distribution.

When a specific image (sprite map) is needed, the elf table is generally referenced through the CSS background-images attribute, the desired sprite image is obtained by offsetting it through the CSS background-position attribute, and then the size of the sprite image is defined in pixels.

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