The online (non-app) Web IDE can't connect via USB yet (unless you use https://github.com/espruino/EspruinoHost which is pretty beta). However, Web Serial support will hopefully land in Chrome in the next 6 months or so which should make it 'just work'.
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.
The online (non-app) Web IDE can't connect via USB yet (unless you use https://github.com/espruino/EspruinoHost which is pretty beta). However,
Web Serial
support will hopefully land in Chrome in the next 6 months or so which should make it 'just work'.