");
      }
      return countString;
    }

result, same first party: Error: No requests received

result, different first party: Error: No requests received

unsupported: true

passed: undefined

test failed: false</span>
</div></td></tr><tr><td><div class="tooltipParent">ServiceWorker<span class="tooltipText">The ServiceWorker API allows websites to run code in the background and store content in the browser for offline use. If a ServiceWorker can be accessed from multiple websites, it can be abused to t