>> require "hpricot" => true >> doc = Hpricot('') => #<Hpricot::Doc> >> doc.add_child(Hpricot::Elem.new("p")) NoMethodError: undefined method `add_child' for #<Hpricot::Doc> from (irb):3 >> doc = Hpricot('') {} => #<Hpricot::Doc> >> doc.add_child(Hpricot::Elem.new("p")) => {emptye</hpricot::doc></hpricot::doc></hpricot::doc>…