Method prerenderAllowed

src/base-element.js:143–145

* Subclasses can override this method to opt-in into being called to * prerender when document itself is not yet visible (pre-render mode). * * The return value of this function is used to determine whether or not the * element will be built _and_ laid out during prerender mode. Therefor

(unusedElement)

   *
   */
  static prerenderAllowed(unusedElement) {
    return false;
  }

  /**
   * Subclasses can override this method to opt-in into being called to