# samdutton/simpl

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5,191 stars · 1,598 forks · HTML · Apache-2.0

## Links

- GitHub: https://github.com/samdutton/simpl
- Homepage: https://simpl.info
- awesome-repositories: https://awesome-repositories.com/repository/samdutton-simpl.md

## Topics

`css` `html` `javascript`

## Description

Simpl is an HTML, CSS, and JavaScript example library that provides a collection of minimal functional demonstrations of core web technologies and native browser APIs. It serves as a reference implementation and pattern gallery for frontend development, offering practical examples of how to implement common web features.

The project showcases a wide range of browser capabilities, including real-time web communication via WebSockets and WebRTC, responsive web design techniques for adaptive layouts, and the implementation of offline workflows using service workers. It also provides demonstrations for client-side storage using IndexedDB and browser-based key-value stores.

The library covers a broad surface of web capabilities, including hardware integration with device sensors and geolocation, advanced media capture and playback for audio and video, and the use of canvas for two- and three-dimensional graphics rendering. Additional areas include data manipulation, asynchronous programming, and the use of browser APIs for monitoring performance and network connectivity.

## Tags

### Education & Learning Resources

- [Frontend Implementations](https://awesome-repositories.com/f/education-learning-resources/development-examples/frontend-implementations.md) — Demonstrate standard HTML, CSS, and JavaScript capabilities via minimal code examples to perform common tasks. ([source](https://cdn.jsdelivr.net/gh/samdutton/simpl@gh-pages/README.md))
- [Frontend Development Resources](https://awesome-repositories.com/f/education-learning-resources/frontend-development-resources.md) — Serves as an educational resource with practical examples for mastering HTML, CSS, and JavaScript interface development.
- [API Reference Implementations](https://awesome-repositories.com/f/education-learning-resources/api-reference-implementations.md) — Provides simple, educational reference implementations for native browser features like Service Workers and IndexedDB.
- [Web API Implementation Patterns](https://awesome-repositories.com/f/education-learning-resources/web-api-implementation-patterns.md) — Provides a practical cookbook of implementations for native browser APIs including geolocation, sensors, and media capture.
- [Web Technology Example Libraries](https://awesome-repositories.com/f/education-learning-resources/web-technology-example-libraries.md) — Provides a comprehensive collection of minimal functional demonstrations covering core web technologies and browser APIs.

### Data & Databases

- [Client-Side Storage](https://awesome-repositories.com/f/data-databases/client-side-storage.md) — Provides a comprehensive gallery of browser-based persistence mechanisms for application data. ([source](http://www.simpl.info/))
- [Client-Side Storage Persistence](https://awesome-repositories.com/f/data-databases/data-engineering-infrastructure/data-persistence-storage/data-storage/client-side-persistence/client-side-storage-persistence.md) — Demonstrates the persistence of structured records in a local browser database. ([source](https://simpl.info/websql))
- [Session Storage](https://awesome-repositories.com/f/data-databases/data-engineering-infrastructure/data-persistence-storage/data-storage/session-storage-synchronization/session-storage.md) — Demonstrates how to use sessionStorage for temporary data persistence within a single browser tab. ([source](https://simpl.info/sessionstorage))
- [Client-Side Data Persistence](https://awesome-repositories.com/f/data-databases/data-management/state-context-management/client-side-data-persistence.md) — Provides demonstrations of persisting application state and user preferences in browser storage.
- [IndexedDB Storage](https://awesome-repositories.com/f/data-databases/data-management/state-context-management/client-side-data-persistence/indexeddb-storage.md) — Provides examples of storing structured application data in a local browser database.
- [IndexedDB Stores](https://awesome-repositories.com/f/data-databases/database-management-systems/database-systems-management/database-systems/indexeddb-stores.md) — Implements a functional demonstration of storing and indexing data using IndexedDB. ([source](https://simpl.info/idbkeyval))
- [Local Data Stores](https://awesome-repositories.com/f/data-databases/local-data-stores.md) — Showcases various browser-based storage systems for managing application state and user data. ([source](https://simpl.info))
- [LocalStorage Persistence](https://awesome-repositories.com/f/data-databases/state-persistence-layers/localstorage-persistence.md) — Provides an example of using localStorage to persist application state across page reloads. ([source](https://simpl.info/localstorage))
- [Asynchronous Data Fetching](https://awesome-repositories.com/f/data-databases/asynchronous-data-fetching.md) — Requests information from a server in the background to update content without page reloads. ([source](https://simpl.info/xhr))

### Graphics & Multimedia

- [Media Capture and Playback](https://awesome-repositories.com/f/graphics-multimedia/audio-music/media-capture-and-playback.md) — Captures and processes audio and video inputs using native browser constraints.
- [Canvas Rendering](https://awesome-repositories.com/f/graphics-multimedia/canvas-rendering.md) — Demonstrates direct pixel manipulation on a drawing surface to render 2D and 3D graphics.
- [Hardware-Accelerated Rendering](https://awesome-repositories.com/f/graphics-multimedia/graphics-engines-rendering/rendering/engines/graphics-pipeline-architectures/hardware-accelerated-rendering.md) — Utilizes the browser graphics engine to render hardware-accelerated 2D and 3D visuals.
- [2D and 3D Graphics Rendering](https://awesome-repositories.com/f/graphics-multimedia/2d-and-3d-graphics-rendering.md) — Demonstrates rendering hardware-accelerated 2D and 3D graphics using the canvas element. ([source](https://simpl.info/webgl))
- [Audio Frequency Visualizations](https://awesome-repositories.com/f/graphics-multimedia/audio-frequency-visualizations.md) — Maps real-time audio waveform data to a visual representation. ([source](https://simpl.info/audiodata))
- [Audio Processing](https://awesome-repositories.com/f/graphics-multimedia/audio-music/audio-processing.md) — Routes audio through filters and gain nodes to modify sound before playback. ([source](https://simpl.info/webaudio))
- [Capture Constraint Management](https://awesome-repositories.com/f/graphics-multimedia/audio-music/media-capture-and-playback/capture-constraint-management.md) — Implements media capture using constraints to programmatically select specific cameras or microphones. ([source](http://www.simpl.info/))
- [Live Capture and Recording](https://awesome-repositories.com/f/graphics-multimedia/audio-music/media-capture-and-playback/live-capture-and-recording.md) — Demonstrates the ability to record live audio and video streams from user devices and save them as files. ([source](https://simpl.info/mediarecorder))
- [Resolution-Based Image Servers](https://awesome-repositories.com/f/graphics-multimedia/image-resolution-downsampling/resolution-based-image-servers.md) — Implements serving different image files based on pixel density for clarity on high-resolution displays. ([source](https://simpl.info/srcsetxvalues))
- [Integrated Screen Captures](https://awesome-repositories.com/f/graphics-multimedia/integrated-screen-captures.md) — Demonstrates capturing a live video feed of the display or a specific window using browser media constraints. ([source](https://simpl.info/getusermedia/screencapture))
- [Media Playback Controls](https://awesome-repositories.com/f/graphics-multimedia/media-playback-controls.md) — Demonstrates how to trigger video playback programmatically via scripts without requiring a manual user click. ([source](https://simpl.info/shortcuts))
- [Chunked Media Playback](https://awesome-repositories.com/f/graphics-multimedia/streaming-distribution/streaming-broadcasting/media-streaming/video-streaming/chunked-media-playback.md) — Implements the splitting of media files into segments and appending them to a video element for streaming. ([source](https://simpl.info/mse))

### Networking & Communication

- [Bidirectional WebSocket Streaming](https://awesome-repositories.com/f/networking-communication/bidirectional-websocket-streaming.md) — Implements real-time, full-duplex communication channels over a single TCP connection.
- [WebRTC Data Channels](https://awesome-repositories.com/f/networking-communication/peer-to-peer-data-exchange/data-channel-establishment/webrtc-data-channels.md) — Create a direct communication channel between two browsers to send data without a server. ([source](https://simpl.info/rtcdatachannel))
- [Peer-to-Peer Media Libraries](https://awesome-repositories.com/f/networking-communication/peer-to-peer-tunneling/peer-to-peer-media-libraries.md) — Establishes direct audio, video, and data channels between browser instances via WebRTC.
- [Real-time Communication](https://awesome-repositories.com/f/networking-communication/real-time-communication.md) — Maintain persistent connections for two-way data exchange or direct peer-to-peer media streaming. ([source](http://www.simpl.info/))
- [Real-Time Data Synchronization](https://awesome-repositories.com/f/networking-communication/real-time-data-synchronization.md) — Create persistent bidirectional connections to push and pull live data updates instantly. ([source](https://simpl.info))
- [Real-Time Web Communication](https://awesome-repositories.com/f/networking-communication/real-time-web-communication.md) — Demonstrates live bidirectional data exchange and peer-to-peer streaming using WebSockets and WebRTC.
- [Server-Sent Events](https://awesome-repositories.com/f/networking-communication/server-sent-events.md) — Maintain a one-way persistent connection to receive real-time server updates as they are pushed. ([source](https://simpl.info/eventsource))
- [Peer Connectivity](https://awesome-repositories.com/f/networking-communication/webrtc-media-orchestration/peer-connectivity.md) — Connect two browser instances to exchange media streams and data directly. ([source](https://simpl.info/rtcpeerconnection))
- [Bidirectional Communication Channels](https://awesome-repositories.com/f/networking-communication/communication-protocols-architectures/communication-protocols-standards/network-protocols/connection-establishment-protocols/websocket-and-fallback-connection-establishment/bidirectional-communication-channels.md) — Establish a persistent bidirectional communication link between a client and server for low-latency data exchange. ([source](https://simpl.info/websocket))

### System Administration & Monitoring

- [Service Worker Lifecycle Managers](https://awesome-repositories.com/f/system-administration-monitoring/service-lifecycle-management/service-worker-lifecycle-managers.md) — Register and control background scripts to implement offline capabilities and synchronize data across sessions. ([source](https://simpl.info/shortcuts))

### User Interface & Experience

- [Responsive Design Patterns](https://awesome-repositories.com/f/user-interface-experience/responsive-design-patterns.md) — Showcases layout strategies and adaptive image techniques that respond to various screen sizes and resolutions.
- [Adaptive UI Layouts](https://awesome-repositories.com/f/user-interface-experience/responsive-layout-adapters/adaptive-ui-layouts.md) — Apply different styles based on window width to ensure content remains usable across screens. ([source](https://simpl.info/mediaqueries))
- [Art Direction Support](https://awesome-repositories.com/f/user-interface-experience/art-direction-support.md) — Demonstrates swapping image crops based on viewport width for effective responsive composition. ([source](https://simpl.info/pictureart))
- [Reusable Template Fragments](https://awesome-repositories.com/f/user-interface-experience/element-groupings/reusable-template-fragments.md) — Demonstrates reusable fragments of markup that are dynamically inserted into the document.
- [Flexible Grid Layouts](https://awesome-repositories.com/f/user-interface-experience/flexible-grid-layouts.md) — Arrange content using grids and flexible boxes to ensure a consistent look across screen sizes. ([source](https://simpl.info))
- [Visual Hover Transitions](https://awesome-repositories.com/f/user-interface-experience/hover-state-trackers/visual-hover-transitions.md) — Change the appearance of an element when a user moves their cursor over it using smooth transitions. ([source](https://simpl.info/csstransition))
- [Viewport-Adaptive Image Selectors](https://awesome-repositories.com/f/user-interface-experience/image-dimension-calculators/viewport-layout-calculators/viewport-adaptive-image-selectors.md) — Shows how to deliver different image formats and resolutions based on browser support and viewport width. ([source](https://simpl.info/picturetype))
- [Responsive Interface Threading](https://awesome-repositories.com/f/user-interface-experience/responsive-interface-threading.md) — Run heavy computations in a separate thread to prevent processing delays and keep the user interface responsive. ([source](https://simpl.info/webworkers))
- [UI Pattern Galleries](https://awesome-repositories.com/f/user-interface-experience/ui-pattern-galleries.md) — Offers a gallery of minimal implementations for common UI layouts and interaction patterns.
- [Vector Graphics Rendering](https://awesome-repositories.com/f/user-interface-experience/vector-graphics-rendering.md) — Implements scalable vector graphics that maintain proportions across different window sizes. ([source](https://simpl.info/svg))
- [Video Players](https://awesome-repositories.com/f/user-interface-experience/video-players.md) — Provides a reference implementation for embedding native video elements with fallback support. ([source](https://simpl.info/longvideo))

### Web Development

- [Browser APIs](https://awesome-repositories.com/f/web-development/browser-integration-utilities/browser-apis.md) — Implementing native browser features like geolocation, device sensors, and media capture using standard web APIs.
- [Asset Caching](https://awesome-repositories.com/f/web-development/browser-integration-utilities/browser-infrastructure/service-worker-controls/service-worker-libraries/asset-caching.md) — Shows how to intercept network requests to cache static assets for offline use.
- [Offline Web Applications](https://awesome-repositories.com/f/web-development/offline-web-applications.md) — Implements offline-first workflows using service workers and asset caching to ensure functionality without network access.
- [Bidirectional Streams](https://awesome-repositories.com/f/web-development/real-time-data-streaming/bidirectional-streams.md) — Implements full-duplex message exchange patterns for real-time communication.
- [Responsive Layout Adaptation](https://awesome-repositories.com/f/web-development/responsive-layout-adaptation.md) — Provides examples of adaptive layouts using CSS media queries and responsive attributes.
- [CSS Media Queries](https://awesome-repositories.com/f/web-development/responsive-layout-adaptation/css-media-queries.md) — Implements adaptive layouts and asset selection using CSS media queries.
- [Service Worker Asset Caching](https://awesome-repositories.com/f/web-development/service-worker-asset-caching.md) — Store website resources locally using a service worker to ensure the page loads without an active internet connection. ([source](https://simpl.info/serviceworker))
- [Background Processing Workers](https://awesome-repositories.com/f/web-development/background-processing-workers.md) — Offloads heavy computations to separate threads using Web Workers to keep the UI responsive.
- [Browser Capability Showcases](https://awesome-repositories.com/f/web-development/browser-capability-showcases.md) — Demonstrates a wide range of hardware and software integrations, from camera access to device orientation.
- [DOM Element Selectors](https://awesome-repositories.com/f/web-development/dom-element-selectors.md) — Locates elements in the document using CSS selectors to retrieve content or properties. ([source](https://simpl.info/queryselector))
- [Image Delivery Optimization](https://awesome-repositories.com/f/web-development/image-delivery-optimization.md) — Implements logic to select the most efficient image format and resolution based on browser support. ([source](https://simpl.info/pictureart))
- [Image Loading Optimization](https://awesome-repositories.com/f/web-development/image-loading-optimization.md) — Shows how to use the sizes attribute to select the optimal image source based on display width. ([source](https://simpl.info/sizeswvalues))
- [Responsive Image Loaders](https://awesome-repositories.com/f/web-development/lazy-loading-libraries/image-lazy-loading/responsive-image-loaders.md) — Implements techniques for selecting the most appropriate image source based on viewport size and device capabilities. ([source](https://simpl.info/imageset))
- [Media Device Enumerations](https://awesome-repositories.com/f/web-development/media-device-enumerations.md) — Provides a method to identify and retrieve available audio and video input sources using native browser APIs. ([source](https://simpl.info/getusermedia/sources))
- [Network Connectivity Monitoring](https://awesome-repositories.com/f/web-development/network-connectivity-monitoring.md) — Check current network availability to alert users when the application transitions between online and offline states. ([source](https://simpl.info/online))
- [Offline Asset Manifests](https://awesome-repositories.com/f/web-development/offline-asset-manifests.md) — Specify which local files the browser should store for offline functionality through a manifest configuration file. ([source](https://simpl.info/appcache))
- [Page Performance Metrics](https://awesome-repositories.com/f/web-development/page-performance-metrics.md) — Capture precise timestamps for DNS and DOM rendering to analyze page load duration. ([source](https://simpl.info/navigationtiming))
- [Resource Timing Analysis](https://awesome-repositories.com/f/web-development/resource-timing-analysis.md) — Calculate the time taken to fetch individual assets in milliseconds to identify loading bottlenecks. ([source](https://simpl.info/resourcetiming))
- [Responsive Video Serving](https://awesome-repositories.com/f/web-development/responsive-video-serving.md) — Demonstrates selecting different video source files based on screen dimensions using media queries. ([source](https://simpl.info/videomedia))
- [User Media Access Controls](https://awesome-repositories.com/f/web-development/user-media-access-controls.md) — Demonstrates accessing camera and microphone inputs using custom resolution constraints and device selection. ([source](https://simpl.info))

### DevOps & Infrastructure

- [Cloud-Hosted Image Serving](https://awesome-repositories.com/f/devops-infrastructure/cloud-hosted-image-serving.md) — Demonstrates delivering efficient image formats via CDN for optimized web delivery. ([source](https://simpl.info/cdnimage))

### Mobile Development

- [Image Capture](https://awesome-repositories.com/f/mobile-development/mobile-capabilities/content-capture/image-capture.md) — Implements the ability to take a single photograph from a connected camera and display it as a static image. ([source](https://simpl.info/imagecapture))

### Software Engineering & Architecture

- [Background Data Synchronization](https://awesome-repositories.com/f/software-engineering-architecture/background-data-synchronization.md) — Synchronize offline data updates and push notifications using background scripts to keep local information current. ([source](http://www.simpl.info/))