    # File lib/yard/templates/helpers/html_helper.rb, line 275
          def link_url(url, title = nil, params = {})
            title ||= url
            title.gsub!(/[\r\n]/, ' ')
            params = SymbolHash.new(false).update(
              :href => url,
              :title  => h(title)
            ).update(params)
            params[:target] ||= '_parent' if url =~ /^(\w+):\/\//
            "<a #{tag_attrs(params)}>#{title}</a>".gsub(/[\r\n]/, ' ')
          end