css sprite is a way to handle background images on web pages. It actually includes all the scattered pictures involved in a page into one big picture, and then applies the big picture to the web page; in this way, when the user visits the page, he only needs to send a request to the service, and the The background image can be fully displayed.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
What is a css sprite?
"CSS sprite", also known as usually interpreted as "CSS image stitching", "CSS map positioning" or "CSS image sprite", "CSS sprite", is A web image application processing method. In fact, it is to include all the scattered pictures involved in a page into one large picture. In this way, when the page is accessed, the loaded pictures will not be displayed slowly one by one as before. .
When the user visits the page, he only needs to send a request to the service, and all the background images in the web page can be displayed.
For example:
Advantages
Using CSS Sprites can effectively reduce the http requests of web pages, thus Greatly improve the performance of the page, which is also the biggest advantage of CSS Sprites and the main reason why it is widely spread and applied;
CSS Sprites can reduce the bytes of images. I have compared The bytes of merging three pictures into one picture many times are always smaller than the sum of bytes of these three pictures.
Solve the problem of web designers in naming pictures. They only need to name a collection of pictures. There is no need to name each small element, thereby improving Improve the efficiency of web page production.
It is easy to change the style. You only need to modify the color or style of one or a few pictures, and the style of the entire web page can be changed. Maintenance is more convenient.
Use of sprite technology
css sprite (sprite) is actually to merge multiple images into one Inside the picture, the background of the web page is laid out through CSS background positioning technology. When images need to be used, the current stage is to use the CSS attribute background-image combined with background-repeat, background-position, etc. to display the image.
Example:
Sprite analysis:
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title></title> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> *{ margin: 0; padding: 0; } .sprites{ width: 200px; margin: 50px auto; } .sprites div{ margin: 5px; } .sprites span{ float: left; width: 20px; height:20px; background: url('./images/icon.png');/* 引用精灵图 */ background-size: 60px 40px; } .sprites1{ background-position: 0 0; } .sprites2{ background-position: -20px 0 !important; } .sprites3{ background-position: 0 -20px !important; } .sprites4{ background-position: -20px -20px !important; } .sprites5{ background-position: -40px 0 !important; } </style> </head> <body> <div class="sprites"> <div><span class="sprites1"></span>付款图标</div> <div><span class="sprites2"></span>存款图标</div> <div><span class="sprites3"></span>删除图标</div> <div><span class="sprites4"></span>粘贴图标</div> <div><span class="sprites5"></span>笑脸图标</div> </div> </body> </html>
The above is the detailed content of what is css sprite. For more information, please follow other related articles on the PHP Chinese website!

Classselectorsareversatileandreusable,whileidselectorsareuniqueandspecific.1)Useclassselectors(denotedby.)forstylingmultipleelementswithsharedcharacteristics.2)Useidselectors(denotedby#)forstylinguniqueelementsonapage.Classselectorsoffermoreflexibili

IDsareuniqueidentifiersforsingleelements,whileclassesstylemultipleelements.1)UseIDsforuniqueelementsandJavaScripthooks.2)Useclassesforreusable,flexiblestylingacrossmultipleelements.

Using a class-only selector can improve code reusability and maintainability, but requires managing class names and priorities. 1. Improve reusability and flexibility, 2. Combining multiple classes to create complex styles, 3. It may lead to lengthy class names and priorities, 4. The performance impact is small, 5. Follow best practices such as concise naming and usage conventions.

ID and class selectors are used in CSS for unique and multi-element style settings respectively. 1. The ID selector (#) is suitable for a single element, such as a specific navigation menu. 2.Class selector (.) is used for multiple elements, such as unified button style. IDs should be used with caution, avoid excessive specificity, and prioritize class for improved style reusability and flexibility.

Key goals and advantages of HTML5 include: 1) Enhanced web semantic structure, 2) Improved multimedia support, and 3) Promoting cross-platform compatibility. These goals lead to better accessibility, richer user experience and more efficient development processes.

The goal of HTML5 is to simplify the development process, improve user experience, and ensure the dynamic and accessible network. 1) Simplify the development of multimedia content by natively supporting audio and video elements; 2) Introduce semantic elements such as, etc. to improve content structure and SEO friendliness; 3) Enhance offline functions through application cache; 4) Use elements to improve page interactivity; 5) Optimize mobile compatibility and support responsive design; 6) Improve form functions and simplify verification process; 7) Provide performance optimization tools such as async and defer attributes.

HTML5transformswebdevelopmentbyintroducingsemanticelements,multimediacapabilities,powerfulAPIs,andperformanceoptimizationtools.1)Semanticelementslike,,,andenhanceSEOandaccessibility.2)Multimediaelementsandallowdirectembeddingwithoutplugins,improvingu

TherealdifferencebetweenusinganIDversusaclassinCSSisthatIDsareuniqueandhavehigherspecificity,whileclassesarereusableandbetterforstylingmultipleelements.UseIDsforJavaScripthooksoruniqueelements,anduseclassesforstylingpurposes,especiallywhenapplyingsty


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 English version
Recommended: Win version, supports code prompts!

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Notepad++7.3.1
Easy-to-use and free code editor

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
