navigationPreload property
      
      NavigationPreloadManager
      get
      navigationPreload
      
    
    
The navigationPreload read-only property of the
ServiceWorkerRegistration interface returns the
NavigationPreloadManager associated with the current service worker
registration.
The returned object allows resources managed by a service worker to be preemptively downloaded in parallel with service worker boot up.
Implementation
external NavigationPreloadManager get navigationPreload;