Select a controller, then choose its user on the PS4 with the D-pad and Cross. Connect one at a time. PS cancels the user-selection screen.
Several gamepads can share one controller. Keep this window active while playing.
The controller needs landscape mode.
Choose what each button and stick on a gamepad does. Mappings are saved in this browser, for every gamepad of the same kind.
Connect a gamepad to this device and press a button on it. If it never shows up, this browser only allows gamepads on secure pages: save this page, open the saved file, and enter the console's address.
Saved on this phone or computer only.
Keys drive the controller open on this page. Choose them on a picture of the controller: click a control, then press its key.