class Nokogiri::XML::NodeSet

def css(*args)

For more information see Nokogiri::XML::Searchable#css

selectors. For example:
Search this node set for CSS +rules+. +rules+ must be one or more CSS

call-seq: css *rules, [namespace-bindings, custom-pseudo-class]
## 
def css(*args)
  rules, handler, ns, _ = extract_params(args)
  paths = css_rules_to_xpath(rules, ns)
  inject(NodeSet.new(document)) do |set, node|
    set + xpath_internal(node, paths, handler, ns, nil)
  end
end