loadFeatures(extent, resolution, projection) {
    this.source?.loadFeatures(extent, resolution, projection);
    if (resolution !== this.resolution) {
      this.resolution = resolution;
      this.refresh();
    }
  }
@param {import("../extent.js").Extent} extent Extent.
@param {number} resolution Resolution.
@param {import("../proj/Projection.js").default} projection Projection.
@override