# File lib/rouge/lexers/css.rb, line 117
      def self.builtins
        @builtins ||= Set.new %w(
          above absolute always armenian aural auto avoid left bottom
          baseline behind below bidi-override blink block bold bolder
          both bottom capitalize center center-left center-right circle
          cjk-ideographic close-quote collapse condensed continuous crop
          cross crosshair cursive dashed decimal decimal-leading-zero
          default digits disc dotted double e-resize embed expanded
          extra-condensed extra-expanded fantasy far-left far-right fast
          faster fixed georgian groove hebrew help hidden hide high higher
          hiragana hiragana-iroha icon inherit inline inline-table inset
          inside invert italic justify katakana katakana-iroha landscape
          large larger left left-side leftwards level lighter line-through
          list-item loud low lower lower-alpha lower-greek lower-roman
          lowercase ltr medium message-box middle mix monospace n-resize
          narrower ne-resize no-close-quote no-open-quote no-repeat none
          normal nowrap nw-resize oblique once open-quote outset outside
          overline pointer portrait px relative repeat repeat-x repeat-y
          rgb ridge right right-side rightwards s-resize sans-serif scroll
          se-resize semi-condensed semi-expanded separate serif show
          silent slow slower small-caps small-caption smaller soft solid
          spell-out square static status-bar super sw-resize table-caption
          table-cell table-column table-column-group table-footer-group
          table-header-group table-row table-row-group text text-bottom
          text-top thick thin top transparent ultra-condensed
          ultra-expanded underline upper-alpha upper-latin upper-roman
          uppercase url visible w-resize wait wider x-fast x-high x-large
          x-loud x-low x-small x-soft xx-large xx-small yes
        )
      end