[1] [CITE@en[Service Workers Nightly]] ([TIME[2017-02-16 20:10:49 +09:00]]) <https://w3c.github.io/ServiceWorker/#service-worker-registration-navigationpreloadmanager>

[2] [CITE@en[Speed up Service Worker with Navigation Preloads | Web | Google Developers]] ([TIME[2017-02-18 00:09:13 +09:00]]) <https://developers.google.com/web/updates/2017/02/navigation-preload>