anchor.diff:              Donec ut quam massa.
               Vestibulum sapien justo, commodo a eros in, rhoncus interdum nisl.
               Etiam a porta lectus. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
  -      section
  +      section#color-scheme
           -
  -          var scheme = {
  +          var color_scheme = {
               aperturewhite : {
                 name        : 'Aperture White'
               , code_dfn    : 'hsv(217,   5%, 100%)'
  
positive.code:                   |  small-caps
                  label.-d-bk
                    input(type="range" name="fw" min="100" max="900" step="100" value="400")
                    input.-w-96px(type="text" value="400 (normal)" disabled="")
                  input.-d-bk(type="reset")
          h2 Typeface Scheme
          +fontBox(font_scheme.base)
  
negative.code:             , code_dfn    : 'fadeout(@apertureblack, 20%)'
              , code_hexa   : 'rgba(#0d0800, 0.8)'
              , bg_class    : 'a-bc-shadeheavy'
              , box_color   : color_scheme.aperturewhite
              }
            , tintheavy : {
                name        : 'Tint Heavy'
              , code_dfn    : 'fadeout(@aperturewhite, 20%)'
              , code_hexa   : 'rgba(#f2f7ff, 0.8)'
              , bg_class    : 'a-bc-tintheavy'
              , box_color   : color_scheme.apertureblack
              , is_dark     : true
              }
            }
  