PointerEvent: tiltX property

The tiltX read-only property of the PointerEvent interface is the angle (in degrees) between the Y-Z plane of the pointer and the screen. This property is typically only useful for a pen/stylus pointer type.

Depending on the specific hardware and platform, user agents will likely only receive one set of values for the transducer orientation relative to the screen plane — either tiltX and tiltY or altitudeAngle and azimuthAngle.

For an additional illustration of this property see Figure 2 in the specification.

someElement.addEventListener(
  "pointerdown",
  (event) => {
    process_tilt(event.tiltX, event.tiltY);
  },
  false,
);