途中まで、まんま >> require "hpricot" => true >> doc = Hpricot('<p>foo1</p><p>foo2</p>') => #<Hpricot::Doc {elem <p> "foo1" </p>} {elem <p> "foo2" </p>}> >> (doc/"p").add_class("bacon") => #<Hpricot::Elements[{elem <p class="bacon"> "foo1" </p>}, {elem <p class="bacon"> "foo2" </p>}]> >> doc.to_html => "