code: function splitAttributes(attrSet) {
  		attrSet = utils.trim(attrSet);
  		var parts = [];
  
  		// split attribute set by spaces
  		var stream = stringStream(attrSet), ch;
  		while ((ch = stream.next())) {
  			if (ch == ' ') {
  				parts.push(utils.trim(stream.current()));
  				// skip spaces
  				while (stream.peek() == ' ') {
  					stream.next();
  				}
  
  				stream.start = stream.pos;
  			} else if (ch == '"' || ch == "'") {
  				// skip values in strings
  				if (!stream.skipString(ch)) {
  					throw new Error('Invalid attribute set');
  				}
  			}
  		}
  
  		parts.push(utils.trim(stream.current()));
  		return parts;
  	}
docs: Splits attribute set into a list of attributes string
  @param  {String} attrSet
  @return {Array}