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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Sadly I don't think it's that easy - if the operating system has recognised the device as a serial port then it'll 'claim' it and create a serial port device with it.
Once that's happened, I don't think Chrome will be able to get access to it, even if it thinks it's a Web USB device... So you can have one, or the other. I could create a separate set of USB endpoints just for chrome, but it starts to get really scary at that point.
I could be wrong about that, but that's the distinct impression I got when I looked into it.
If I created a bunch of plugins for different platforms and a single library you could use to get serial access, that might even work better for your use case though?