code: function getEventPosition(event) {
      let _event = event
      if (event.touches) {
          [_event] = event.touches
      }
      return [
          _event.pageX - window.pageXOffset,
          _event.pageY - window.pageYOffset
      ]
  }
docs: -- Utils -- 
  Return the `[x, y]` position of an event.