Google’s most recent Chrome browser, version 53, includes trial support for Web Bluetooth, and it’s like the Wild West! JavaScript code, served to your browser, can now connect directly to your Bluetooth LE (BTLE) devices, with a whole bunch of caveats that we’ll make clear below.
http://hackaday.com/2016/09/23/web-bluetooth-the-new-hotness-and-its-dangers/