Browser Feature Detector
Check which modern web APIs and JavaScript features your browser supports.
Advertisement
Your Browser
💡 Tip: Feature support varies by browser version and device. Use these results to implement progressive enhancement and appropriate polyfills.
Advertisement
How to Use the Browser Feature Detector
This browser feature detector analyzes your current browser and reports which modern web APIs, JavaScript features, and browser capabilities are available. The tool runs over 100 different feature detection tests instantly, organized into categories like Storage APIs, Graphics & Media, Network APIs, Device APIs, and Performance APIs.
Green checkmarks indicate supported features, while red X marks show unsupported features. Click on any category to expand and see detailed results. The tool detects everything from basic features like localStorage to advanced APIs like WebGL 2.0, Web Workers, Service Workers, WebRTC, IndexedDB, Geolocation, and more.
Use this tool when building progressive web apps to understand what fallbacks you need. For example, if Service Workers aren't supported, you can't implement offline functionality. If WebGL isn't available, you'll need canvas or SVG alternatives for graphics. The support percentage at the top shows overall browser compatibility.
Developers can use these results to make informed decisions about polyfills, feature flags, and progressive enhancement strategies. The tool is especially useful for mobile testing — open it on different devices to see how mobile browser support differs from desktop. All tests run client-side and reflect your exact browser configuration.
Frequently Asked Questions
What is browser feature detection?
Browser feature detection is the practice of checking whether a browser supports specific web APIs, CSS properties, or JavaScript features before using them. This is better than user-agent sniffing because it detects actual capabilities rather than assuming based on browser version.
Why should I use feature detection instead of browser detection?
Feature detection is more reliable because browsers update frequently and support varies between versions. Checking for the actual feature (like 'localStorage' in window) is more accurate than inferring support from a user-agent string. It also gracefully handles non-standard browsers and polyfills.
What are some commonly checked browser features?
Common features include: localStorage and sessionStorage for client-side data, Service Workers for offline support, WebGL for 3D graphics, Geolocation API for location services, Web Workers for background threads, IndexedDB for large databases, Fetch API for HTTP requests, and WebSockets for real-time communication.
How does this tool detect features?
This tool runs JavaScript checks directly in your browser. It looks for APIs in the window object, attempts to create instances of objects, and tests for specific capabilities. All detection happens client-side, so results reflect your actual browser's capabilities in real-time.
What should I do if a feature is not supported?
You have several options: Use a polyfill (JavaScript that implements the feature), provide alternative implementations (progressive enhancement), gracefully degrade functionality, or inform users that certain features won't work. Many polyfills are available on npm for common features.
Can I use this for mobile browser testing?
Yes! Open this tool on any mobile device to see which features that browser supports. Mobile browsers often have different capabilities than desktop browsers, especially for features like Geolocation, Device Orientation, and Touch Events. This tool works on iOS, Android, and all major mobile browsers.