function mapExistingElement(name) {
      if (metaElements[name]) {
        return true;
      }

      var element = document.getElementsByName(name)[0];

      if (!element) {
        return false;
      }

      metaElements[name] = angular.element(element);

      return true;
    }
Checks if the requested element was written manually and maps it

@param {string} name meta tag 'name' attribute value
@returns {boolean} returns true if there is an element with the requested name