instance method method_missing

# File activesupport/lib/active_support/vendor/builder-2.1.2/builder/css.rb, line 171
    def method_missing(sym, *args, &block)
      sym = "#{sym}:#{args.shift}" if args.first.kind_of?(Symbol)
      if block
        _start_container(sym, args.first)
        _css_block(block)
        _unify_block
      elsif @in_block
        _indent
        _css_line(sym, *args)
        _newline
        return self
      else
        _start_container(sym, args.first, false)
        _unify_block
      end
      self
    end