code: function parseSpaces(css) {
      var start = pos;
  
      // Read the string until we meet a non-space character:
      for (; pos < css.length; pos++) {
        if (css.charAt(pos) !== ' ') break;
      }
  
      // Add a substring containing only spaces to tokens:
      pushToken(TokenType.Space, css.substring(start, pos--), col);
      col += pos - start;
    }
docs: Parse spaces
  @param {string} css Unparsed part of CSS string