class Nokogiri::XML::DocumentFragment

def to_html(*args)

See Nokogiri::XML::NodeSet#to_html
Convert this DocumentFragment to html
## 
def to_html(*args)
  if Nokogiri.jruby?
    options = args.first.is_a?(Hash) ? args.shift : {}
    unless options[:save_with]
      options[:save_with] = Node::SaveOptions::NO_DECLARATION | Node::SaveOptions::NO_EMPTY_TAGS | Node::SaveOptions::AS_HTML
    end
    args.insert(0, options)
  end
  children.to_html(*args)
end