Method forElementOptional

src/service/resource.js:95–97

* @param {!Element} element * @return {Resource}

(element)

   * @return {Resource}
   */
  static forElementOptional(element) {
    return /** @type {Resource} */ (element[RESOURCE_PROP_]);
  }

  /**
   * Assigns an owner for the specified element. This means that the resources