Controller and input
Controller & Input Problem Guide
Separate connection and platform problems from browser-visible controller, mouse, and keyboard input, then open only the test that can observe the reported behavior.
Choose device
Which input device has the problem?
Choose the device first so connection, platform, and browser-visible input questions stay separate.
No automatic diagnosis. Browser input can narrow the next step, but it cannot certify a controller, mouse, or keyboard; diagnose power, charging, radio interference, firmware, console or game compatibility, or electrical switches; or measure raw USB polling and end-to-end hardware latency.