code: function(prop) {
  	var result, match;
  	if((match = prop.match(/^\-(w|m|s|o)+\-/) || prop.charAt(0) === '-') && !prop.match(/^\-(webkit|moz|ms)+\-/)) {
  		if(match !== null && match[0]) {
  			result = { prefix: match[0].replace(/-/g, '') }
  			result.prop = prop.replace(match[0], '');
  		} else {
  			result = { prefix: '' }
  			result.prop = prop.substr(1, prop.length);
  		}
  	} else {
  		result = {
  			prefix: false,
  			prop: prop
  		}
  	}
  	return result;
  }
docs: http://docs.emmet.io/css-abbreviations/vendor-prefixes/ (w: webkit, m: moz, s: ms, o: o)