code: function comment() {
      var pos = position();
      if ('/' != css.charAt(0) || '*' != css.charAt(1)) return;
  
      var i = 2;
      while ("" != css.charAt(i) && ('*' != css.charAt(i) || '/' != css.charAt(i + 1))) ++i;
      i += 2;
  
      if ("" === css.charAt(i-1)) {
        return error('End of comment missing');
      }
  
      var str = css.slice(2, i - 2);
      column += 2;
      updatePosition(str);
      css = css.slice(i);
      column += 2;
  
      return pos({
        type: 'comment',
        comment: str
      });
    }
docs: Parse comment.