Connect a controller and press any button. Chrome, Edge, Firefox and most Chromium browsers work best. Some pads need a press before the API wakes up.
| # | Axis | Value |
|---|
Standard map: 0 A · 1 B · 2 X · 3 Y · 4 LB · 5 RB · 6 LT · 7 RT · 8 Back · 9 Start · 10 L3 · 11 R3 · 12–15 D-pad · 16 Home. Axes 0/1 left stick, 2/3 right stick. Circularity flags hardware that travels outside a unit circle (r>1) or never reaches the rim.