              <button class="network-first-failing">
                Network First Request (Failing URL)
              </button>
            </p>
          </li>
          <li>
            <p>
              <button class="stale-while-revalidate">
                Stale While Revalidate Request
              </button>
            </p>
          </li>
        </ul>
      </li>
    </ol>

    <script>
      const cacheOnlyEmpty = document.querySelector('.cache-only-empty-cache');
      const cacheOnlyPopulated 