range(_cfi, ignoreClass) {
    var cfi = new _epubcfi__WEBPACK_IMPORTED_MODULE_2__[/* default */ "a"](_cfi);
    return cfi.toRange(this.document, ignoreClass);
  }
Get a Dom Range from EpubCFI
@param {EpubCFI} _cfi
@param {string} [ignoreClass]
@returns {Range} range