code: function scanForFocusable(target, selector) {
          var elFound, items = target[0].querySelectorAll(selector);
  
          // Find the last child element with the focus attribute
          if (items && items.length){
            items.length && angular.forEach(items, function(it) {
              it = angular.element(it);
  
              // Check the element for the md-autofocus class to ensure any associated expression
              // evaluated to true.
              var isFocusable = it.hasClass('md-autofocus');
              if (isFocusable) elFound = it;
            });
          }
          return elFound;
        }
docs: Can target and nested children for specified Selector (attribute)
  whose value may be an expression that evaluates to True/False.