code: function getOriginalStyle(element, prop) {
  
  	var matchedRules = [];
  	var value;
  	var j;
  
  	matchedRules = sortRulesBySpecificity(
  		filterRulesByElementAndProp(styleCache[prop], element, prop)
  	);
  
  	// Add style attribute
  	matchedRules.unshift({
  		_rule: {
  			style: element.style,
  		},
  	});
  
  	// Loop through all important styles
  	for (j = 0; j < matchedRules.length; j++) {
  		if (
  			(value = matchedRules[j]._rule.style.getPropertyValue(prop))
  			&& matchedRules[j]._rule.style.getPropertyPriority(prop) === 'important'
  		) {
  			return value;
  		}
  	}
  
  	// Loop through all non-important styles
  	for (j = 0; j < matchedRules.length; j++) {
  		if (
  			(value = matchedRules[j]._rule.style.getPropertyValue(prop))
  			&& matchedRules[j]._rule.style.getPropertyPriority(prop) !== 'important'
  		) {
  			return value;
  		}
  	}
  
  	return undefined;
  
  }
docs: Get the original style of an element as it was specified in CSS
  
  @param  {Element} element
  @param  {string}  prop    Property to return, e.g. `width` or `height`
  @return {string}