I'd like to see some real standardized cross-browser interface between the browser and external devices (or applications on the same device). Previously there w

I'd like to see some real standardized cross-browser interface between the browser and external devices (or applications on the same device). Previously there was NPAPI which did only the latter, and if you only need input to your device you can do that by emulating a USB (or possibly bluetooth) keyboard, which I think is what Yubikey does by the way. I know that there are people who don't want the browser to be able to communicate with other devices or applications (for security or privacy reasons). But this project shows that it's already possible with the audio transmission, and for output that has been possible for 15(?) or so years with the <bgsound> tag. Or by flashing the screen or showing QR codes on the screen.