The annotation reference tests now show the date/time placeholder, but since localization is not active we don't see the actual date/time string. It would be nice to be able to have this in the reference images.
const capability = createPromiseCapability();
    this.inflight.textContent = this.inFlightRequests++;
    fetch(url, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
      },
      body: message,
    })
      .then(response => {
        
        if (!response.ok || response.status !== 200) {
          throw new Error(response.statusText);
        }
        this.inFlightRequests--;
        capability.resolve();
      })
      .catch(reason => {
        console.warn(`Driver._send failed (${url}): ${reason}`);
        this.inFlightRequests--;
        capability.resolve();
        this._send(url, message);
      });
    return capability.promise;
  }
}