I don't understand what you mean. We're talking about a piano keyboard by the way, not a typing keyboard. The browser uses it via the MIDIAccess API, and simply

I don't understand what you mean. We're talking about a piano keyboard by the way, not a typing keyboard. The browser uses it via the MIDIAccess API, and simply sets up a callback for MIDI codes, such as noteOn, noteOff, etc. I have used it extensively.