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ServiceWorkerRegistration.navigationPreload

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The navigationPreload read-only property of the ServiceWorkerRegistration interface returns the NavigationPreloadManager associated with the current service worker registration.

var navigationPreloadManager = serviceWorkerRegistration.navigationPreload

Specification	Status	Comment
Service Workers The definition of 'navigationPreload' in that specification.	Working Draft	Initial definition.

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	59	17 17 16 Disabled Disabled From version 16: this feature is behind the `Enable service workers` preference.	44 44 Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR).	No	46	11.1

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	59	59	?	44	46	11.1	4.0

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https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerRegistration/navigationPreload