code: function wheelTimedOut(element) {
  
    // Snap to the closest item.
    element[symbols.dragging] = false;
    const travelFraction = element.travelFraction;
    if (travelFraction >= 0.5) {
      element[symbols.goRight]();
    } else if (travelFraction <= -0.5) {
      element[symbols.goLeft]();
    }
  
    // TODO: Listen for the transition to complete, and then restore
    // dragging to false (or the previous value).
  
    resetWheelTracking(element);
  }
docs: A sufficiently long period of time has passed since the last wheel event. We snap the selection to the closest item, then reset our state.