getTarget() {
    return /** @type {HTMLElement|string|undefined} */ (
      this.get(MapProperty.TARGET)
    );
  }
Get the target in which this map is rendered.
Note that this returns what is entered as an option or in setTarget:
if that was an element, it returns an element; if a string, it returns that.
@return {HTMLElement|string|undefined} The Element or id of the Element that the
    map is rendered in.
@observable
@api