resize(width, height, epubcfi) {
    if (width) {
      this.settings.width = width;
    }

    if (height) {
      this.settings.height = height;
    }

    this.manager.resize(width, height, epubcfi);
  }
Trigger a resize of the views
@param {number} [width]
@param {number} [height]
@param {string} [epubcfi] (optional)