Haptic configuration with an eccentric rotating mass (ERM) vibration motor in each handle of a standard gamepad.
In this configuration, either motor is capable of vibrating the whole gamepad.
https://www.w3.org/TR/gamepad/#dom-gamepadhapticeffecttype-dual-rumble
Haptics configuration with a vibration motor in each of the bottom front buttons.
https://www.w3.org/TR/gamepad/#dom-gamepadhapticeffecttype-trigger-rumble
Haptic configuration with an eccentric rotating mass (ERM) vibration motor in each handle of a standard gamepad.
In this configuration, either motor is capable of vibrating the whole gamepad.
https://www.w3.org/TR/gamepad/#dom-gamepadhapticeffecttype-dual-rumble