Navigator.serviceWorker

The Navigator.serviceWorker read-only property returns the ServiceWorkerContainer object for the associated document, which provides access to registration, removal, upgrade, and communication with the ServiceWorker.

The feature may not be available in private mode.

ServiceWorkerContainer.

This code checks if the browser supports service workers.

if ('serviceWorker' in navigator) {
  // Supported!
}

• Service Worker API
• Using Service Workers