# File lib/action_controller/assertions/dom_assertions.rb, line 23
      def assert_dom_equal(expected, actual, message = "")
        clean_backtrace do
          expected_dom = HTML::Document.new(expected).root
          actual_dom   = HTML::Document.new(actual).root
          DomAssertions.strip_whitespace!(expected_dom.children)
          DomAssertions.strip_whitespace!(actual_dom.children)

          full_message = build_message(message, "<?> expected but was\n<?>.", expected_dom.to_s, actual_dom.to_s)
          assert_block(full_message) { expected_dom == actual_dom }
        end
      end