The problem is you have to be willing to define a scope for what a web page should and shouldn't do. The largest developer of web browsers though happens to be

The problem is you have to be willing to define a scope for what a web page should and shouldn't do. The largest developer of web browsers though happens to be obsessed with injecting support for crud like MIDI devices and serial ports to the web platform though, which makes it hard to define a good boundary for behavior.