# File lib/sass/script/functions.rb, line 426 def alpha(*args) if args.all? do |a| a.is_a?(Sass::Script::String) && a.type == :identifier && a.value =~ /^[a-zA-Z]+\s*=/ end # Support the proprietary MS alpha() function return Sass::Script::String.new("alpha(#{args.map {|a| a.to_s}.join(", ")})") end opacity(*args) end