    # File lib/action_controller/assertions/selector_assertions.rb, line 539
            def response_from_page_or_rjs()
              content_type = @response.headers["Content-Type"]
              if content_type && content_type =~ /text\/javascript/
                body = @response.body.dup
                root = HTML::Node.new(nil)
                while true
                  next if body.sub!(RJS_PATTERN_EVERYTHING) do |match|
                    html = unescape_rjs($3)
                    matches = HTML::Document.new(html).root.children.select { |n| n.tag? }
                    root.children.concat matches
                    ""
                  end
                  break
                end
                root
              else
                html_document.root
              end
            end