class Nokogiri::HTML5::DocumentFragment

def extract_params(params) # :nodoc:
  handler = params.find do |param|
    ![Hash, String, Symbol].include?(param.class)
  end
  params -= [handler] if handler
  hashes = []
  while Hash === params.last || params.last.nil?
    hashes << params.pop
    break if params.empty?
  end
  ns, binds = hashes.reverse
  ns ||=
    begin
      ns = {}
      children.each { |child| ns.merge!(child.namespaces) }
      ns
    end
  [params, handler, ns, binds]
end