


CodePen is an online front-end code editing and display website that can write code and preview the effect instantly. You can share your Web works online, and you can also enjoy the various amazing effects achieved by outstanding developers from all over the world on web pages.
Today’s article has selected 15 cool examples of CSS animation effects for you. These demos can be said to be works of art. (To ensure the best results, please browse in modern browsers such as Chrome, Firefox and Safari)
9. 3D Synth
Pure CSS 3D Synthesizer (mousedown for rotation) by Nikolay Talanov (@suez).
A 3D electronic keyboard effect made using pure CSS, which can be rotated by clicking the mouse.
10. Cascading Solar System
Cascading Solar System! by Tady Walsh (@tadywankenobi).
Model of the solar system, complete with rotation speed, Details of moons and every big planet. Looks like real world stuff!
11. 3D Solar System
Full CSS 3D Solar System by Wayne Dunkley (@waynedunkley).
Another system model of the solar system, but This one is 3D and has beautiful shadow effects.
12. Flat Design Camera
Flat design camera with CSS animation by Damien Pereira Morberto (@damienpm).
Use CSS animation to simulate the camera Press the shutter button to take photos with animation effects.
13. Day and Night Transition
Day Night simulation by Szymon Stypa (@Catagen).
Click the button below to see day and night transition Dark night simulation effect.
14. Animated Sprite with CSS
Animate sprite with CSS by Avaz Bokiev (@samarkandiy).
Demonstration sequence image (Sprite image) can Used to create stop-motion animations, complete with forward and reverse motion.
15. Dodecahedron
Dodecahedron by wontem (@wontem).
A subtle, beautiful dodecahedron animation created entirely in CSS .
The page is too stuck to load. For the previous article, please check here "15 Cool CSS Animation Effects from CodePen [Part 2]"
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The future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.

HTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese

The alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.


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