epubReadingSystem(name, version) {
    navigator.epubReadingSystem = {
      name: name,
      version: version,
      layoutStyle: this.layoutStyle(),
      hasFeature: function (feature) {
        switch (feature) {
          case "dom-manipulation":
            return true;

          case "layout-changes":
            return true;

          case "touch-events":
            return true;

          case "mouse-events":
            return true;

          case "keyboard-events":
            return true;

          case "spine-scripting":
            return false;

          default:
            return false;
        }
      }
    };
    return navigator.epubReadingSystem;
  }
Add the epubReadingSystem object to the navigator
@param {string} name
@param {string} version
@private