code: public function getRaw()
      {
          if (is_integer($this->focus)) {
              return $this->frames[$this->focus]->getRaw();
          }
          $raw = '';
          for ($i = 0; $i < count($this->frames); $i++) {
              $raw .= $this->frames[$i]->getRaw();
          }
  
          return $raw;
      }
docs: Accessor for raw text of either all the pages or the frame in focus.
  
  @return string        Raw unparsed content.