From GitHub: https://github.com/Unity-Technologies/InputSystem/issues/675

Repro:
1. Download package and project at: https://github.com/Unity-Technologies/InputSystem
2. Open Tank Demo scene (Assets -> TanksDemo -> Assets -> Scenes -> NewInput)
3. Build and Run in OpenGL

Actual: No input works in WebGL

Note:
- I tried with both "Send Messages" and "Invoke Unity Event", neither works.
- None of the keyboard, mouse or controller works for me. But when using Input Debugger with remove device, I do see input update in the device window.