Function markUnresolvedElements

src/custom-element.js:2229–2236

(opt_extension)

 * @param {string=} opt_extension
 */
export function markUnresolvedElements(opt_extension) {
  unresolvableExtensions.add(opt_extension || '*');
  for (const el of stubbedElements) {
    if (opt_extension == null || el.tagName.toLowerCase() === opt_extension) {
      el.markUnresolved();
    }
  }
}

/** */
export function resetUnresolvedElementsForTesting() {