Developer Essentials · Free Tool
Browser Feature Detector
Check which modern web APIs and CSS features your browser supports — from WebGPU and Service Workers to :has() and container queries. Search the list. Runs entirely in your browser.
How it works
Each feature is checked with a tiny test — looking for a property on window or navigator, or asking CSS.supports() whether a CSS feature is understood. This is exactly how progressive-enhancement code decides what to use. Results reflect this browser on this device and are computed locally.