code: function athost() {
      var pos = position();
      var m = match(/^@host */);
  
      if (!m) return;
  
      if (!open()) return error("@host missing '{'");
  
      var style = comments().concat(rules());
  
      if (!close()) return error("@host missing '}'");
  
      return pos({
        type: 'host',
        rules: style
      });
    }
docs: Parse host.