code: function translateWithValueToCssClass(scope, element, attrs) {
        var updateFn = updateClassWithValue(element, className, attrs);
        var unwatch = attrs.$observe(attrs.$normalize(className), updateFn);
  
        updateFn(getNormalizedAttrValue(className, attrs, ""));
        scope.$on("$destroy", function() { unwatch(); });
      }
docs: Add as transformed class selector(s), then
  remove the deprecated attribute selector