Html5 Slot Machine is a browser-based casino slot machine game built with vanilla HTML, CSS and JavaScript that uses the Web Animations API to spin reels without any frameworks or Flash.
What is Html5 Slot Machine?
Html5 Slot Machine is a fully client-side slot machine proof of concept created by GitHub user johakr. It takes no server-side input; all game logic and rendering happen in the browser, and it produces animated reel spins with configurable callback events. The project runs on any modern browser and is deployed as a static site on GitHub Pages, with a live demo linked in the repository.
Key Features
- Vanilla stack — No Flash or frameworks; only HTML, CSS, and JavaScript, giving a low bundle size and fast performance.
- Web Animations API — Reels are animated natively via the Web Animations API instead of a third-party animation library.
- Responsive design — Fully responsive for mobile, web, and fullscreen modes.
- Autoplay — Autoplay functionality continues spinning even when the game window is in the background.
- Config object — The config in index.js exposes
invertedto control reel spin direction andonSpinStart/onSpinEndcallbacks that receive the symbols pattern array. - Free icons — The Star Wars-themed icons by KPD Media are free for private and commercial use and require no attribution.
Who is it for?
- Web developers — As a reference for building interactive games with the Web Animations API and vanilla JavaScript.
- Gambling/game developers — As a foundation or proof of concept for slot machine mechanics such as reels, spin callbacks, and pattern handling.
- Educators and hobbyists — To learn how a modern browser API like Web Animations can create engaging, framework-free experiences.
What can you do with Html5 Slot Machine?
- Add a slot machine to a page — Embed the built static files into any site to offer a responsive slot game with autoplay.
- Configure spin feedback — Set
onSpinStartandonSpinEndcallbacks to log or react to every symbol pattern the reels produce. - Customize the game direction — Set
invertedto choose whether reels spin top-to-bottom or bottom-to-top.
How does Html5 Slot Machine work?
The repository includes installation and build steps: clone the repository, run npm install, then either npm start for development at http://localhost:8080 or npm run build to generate a production bundle in /dist. Runtime behavior is controlled by a config object in index.js, letting developers tweak spin direction and subscribe to spin start/end events.
FAQ
Does Html5 Slot Machine need a framework or Flash?
No. It is built with only vanilla HTML, CSS and JavaScript, so it runs in any modern browser without plugins.
Can I use it on mobile devices?
Yes, the layout is fully responsive and adapts to mobile, web and fullscreen viewing.
How do I run it locally?
Clone the repo, run npm install followed by npm start, then open http://localhost:8080 in your browser. For production, use npm run build and serve the contents of the dist folder.
Is the art free to use?
The Star Wars-themed icons were created by KPD Media and are free for private and commercial use with no attribution required.
Does autoplay work in the background?
Yes, autoplay keeps running even when the game window is in the background.
