https://developer.mozilla.org/en-US/docs/Web/API/GamepadHapticActuator/effects
GamepadHapticActuator: effects property - Web APIs | MDN
The effects read-only property of the GamepadHapticActuator interface returns an array of enumerated values representing the different haptic effects that the...
web apiseffectspropertymdn
https://developer.mozilla.org/en-US/docs/Web/API/GamepadHapticActuator/playEffect
GamepadHapticActuator: playEffect() method - Web APIs | MDN
The playEffect() method of the GamepadHapticActuator interface causes the hardware to play a specific vibration effect.
web apismethodmdn