An extension provides serial port access ability for your website
This chrome app provides serial port access ability for your website.
You can easily send/receive data to/from your devices like Arduino, Raspberry Pi and other MCUs through serial ports of your PC.
An example here "https://jsfiddle.net/strawmanbobi/nt4x3c23/" shows how to use it.
Open source project on Github : https://github.com/strawmanbobi/web-com