code: protected function addContentToAllOpenTags($text)
      {
          foreach (array_keys($this->tags) as $name) {
              for ($i = 0, $count = count($this->tags[$name]); $i < $count; $i++) {
                  $this->tags[$name][$i]->addContent($text);
              }
          }
      }
docs: Any content fills all currently open tags unless it is part of an option tag.
  
  @param string $text        May include unparsed tags.