ReadonlyaxesThe Gamepad.axes property of the Gamepad interface returns an array representing the controls with axes present on the device (e.g., analog thumb sticks).
ReadonlybuttonsThe buttons property of the Gamepad interface returns an array of GamepadButton objects representing the buttons present on the device.
ReadonlyconnectedThe Gamepad.connected property of the still connected to the system.
ReadonlyidThe Gamepad.id property of the Gamepad interface returns a string containing some information about the controller.
ReadonlyindexThe Gamepad.index property of the Gamepad interface returns an integer that is auto-incremented to be unique for each device currently connected to the system.
ReadonlymappingThe Gamepad.mapping property of the remapped the controls on the device to a known layout.
ReadonlytimestampThe Gamepad.timestamp property of the representing the last time the data for this gamepad was updated.
ReadonlyvibrationThe vibrationActuator read-only property of the Gamepad interface returns a GamepadHapticActuator object, which represents haptic feedback hardware available on the controller.
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Gamepadinterface of the Gamepad API defines an individual gamepad or other controller, allowing access to information such as button presses, axis positions, and id.MDN Reference