Web Bluetooth is now available in Windows 10 in Chrome 70 @googlechrome @ChromiumDev @BluetoothSIG #bluetooth
New in Chrome 70 | Web | Google Developers.
Web Bluetooth is now available in Windows 10, and allows your site to communicate with nearby user-selected Bluetooth devices in a secure and privacy-preserving way.
So we’ll see Bluetooth Makecode, Bluetooth REPL, etc. and web apps that interact with CircuitPython and more soon 
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).
Demos
https://googlechrome.github.io/samples/web-bluetooth/
https://github.com/WebBluetoothCG/demos
Documentation
https://developers.google.com/web/updates/2015/07/interact-with-ble-devices-on-the-web
https://www.w3.org/community/web-bluetooth/
https://developer.mozilla.org/en-US/docs/Web/API/Web_Bluetooth_API
Related
Web Bluetooth - Allows web sites to communicate over GATT with nearby user-selected Bluetooth devices in a secure and privacy-preserving way – caniuse.com.
IoT Applications and Web Bluetooth – presentation by Martin Woolley, Developer Relations Manager (EMEA), Bluetooth SIG.
Web Bluetooth Tutorials – Bluetooth.com
