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HTML5 Support Test

Quickly test which HTML5 & modern web platform features your browser supports.
Overall result
Running tests…
This runs feature-detection in your browser only.
localStorage
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sessionStorage
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IndexedDB
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Canvas 2D
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WebGL
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WebGPU
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HTMLVideo element
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HTMLAudio element
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Picture / srcset
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ES6 (let/const, arrow)
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WebAssembly
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Web Workers
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Fetch API
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Service Worker
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Cache API
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Drag & Drop
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Pointer Events
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Fullscreen API
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getUserMedia
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WebRTC
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WebSocket
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Clipboard API
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Permissions API
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History API
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CSS Grid
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Flexbox
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CSS Variables
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Notes: These tests are best-effort feature detections performed in the browser. Some features (e.g., codec support) are reported as “probably” supported based on feature checks — codec availability can vary by platform and installed codecs.

What Is HTML5?

HTML5 is the latest major version of the HyperText Markup Language (HTML), the standard language used to structure content on the web. HTML5 introduces modern features for multimedia, graphics, offline storage, performance, and improved semantics—without requiring extra plugins like Flash or Silverlight.

Key HTML5 enhancements include:

  • Built-in audio and video support
  • Canvas 2D drawing and WebGL for graphics
  • LocalStorage & sessionStorage for offline data
  • New semantic tags (header, nav, section, article, footer)
  • Improved forms and input types
  • Geolocation API
  • WebSockets for real-time communication

What an HTML5 Support Test Checks

An HTML5 Support Test evaluates whether your browser supports modern web technologies.

  • Video formats: MP4, WebM, Ogg
  • Audio formats: MP3, AAC, WAV, Ogg
  • Canvas drawing & 2D rendering
  • WebGL or WebGL2 support
  • LocalStorage, sessionStorage, IndexedDB
  • Geolocation API
  • WebSockets & Server-Sent Events
  • Input types: date, email, number, range, color, etc.
  • Drag-and-drop API
  • Browser support for semantic HTML5 tags

Different browsers support different subsets of HTML5 features depending on version, platform, and rendering engine.

Why HTML5 Support Matters

HTML5 compatibility is important because it affects:

  • Website performance and speed
  • Browser compatibility for modern apps
  • Video and audio playback support
  • Game and graphics rendering capability
  • Offline browsing features
  • Security and stability

Many modern web applications rely on HTML5 APIs to function properly—if your browser lacks support, features may fail or be downgraded.

Why Use an HTML5 Support Test?

A Test helps you understand:

  • What HTML5 features your browser supports
  • Whether you can run modern websites or web apps
  • If you need to update your browser
  • Compatibility for audio, video, games, and 3D graphics
  • Whether your device is suitable for development or testing

What HTML5 support means

“HTML5” is shorthand for the modern web platform — not just the markup, but the whole set of browser APIs that replaced old plugins like Flash and Silverlight. An HTML5 support test checks which of these capabilities your browser can actually use: native audio and video, canvas and WebGL graphics, geolocation, local and session storage, service workers for offline apps, WebSockets, drag-and-drop, form validation, and more. The more features supported, the richer the web apps your browser can run.

Key HTML5 features and what they enable

FeatureWhat it enables
Canvas / WebGL2D and 3D graphics, games, charts, image editing
Audio / VideoNative media playback without plugins
Local & Session StorageSaving data in the browser between visits
Service WorkersOffline support and installable web apps (PWAs)
GeolocationLocation-aware sites like maps and weather
WebSocketsReal-time apps: chat, live scores, collaboration

Frequently asked questions

What is HTML5?

HTML5 is the current generation of the web standard, combining modern markup with browser APIs for media, graphics, storage, offline apps and real-time communication — all without external plugins.

Is HTML5 supported in my browser?

Almost certainly yes. Every up-to-date browser — Chrome, Edge, Firefox, Safari — supports the full HTML5 feature set. The test above shows exactly which features are available and flags any that aren’t.

Why do some HTML5 features fail?

Usually because the browser is outdated, a feature requires a secure (HTTPS) context, a privacy setting or extension blocks it, or you’re in a restricted mode like incognito. Updating your browser resolves most gaps.

Do I still need Flash?

No. Flash reached end-of-life in 2020 and is removed from all modern browsers. HTML5 replaced everything it did — video, audio, animation and interactivity — natively and more securely.

What’s the difference between HTML5 and a PWA?

HTML5 is the underlying platform of features; a Progressive Web App is a website that uses those features (especially service workers and a manifest) to behave like an installable, offline-capable app.