html_document_fragment_class

# File actiontext/lib/action_text.rb, line 53
    def html_document_fragment_class
      return @html_document_fragment_class if defined?(@html_document_fragment_class)
      @html_document_fragment_class =
        defined?(Nokogiri::HTML5) ? Nokogiri::HTML5::DocumentFragment : Nokogiri::HTML4::DocumentFragment
    end