Allows web sites to communicate over GATT with nearby user-selected Bluetooth devices in a secure and privacy-preserving way. Status in Chrome is more complicated than can be captured by this form. In Chrome 56, this shipped on Android, ChromeOS, and macOS. In Chrome 70 it is shipping on Windows 10. For earlier versions of Windows and Linux, it is still behind a flag (chrome://flags/#enable-experimental-web-platform-features).
Docs: https://web.dev/bluetooth/ https://www.w3.org/community/web-bluetooth/ https://developer.mozilla.org/en-US/docs/Web/API/Web_Bluetooth_API
Samples: https://googlechrome.github.io/samples/web-bluetooth/ https://github.com/WebBluetoothCG/demos