Limited availability
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
The backgroundFetch read-only property of the ServiceWorkerRegistration interface returns a reference to a BackgroundFetchManager object, which can be used to initiate background fetch operations.
A BackgroundFetchManager object.
The following code accesses the backgroundFetch property and uses it to initiate a background fetch operation.
// main.js
async function requestBackgroundFetch(movieData) {
const swRegistration = await navigator.serviceWorker.ready;
const fetchRegistration = await swRegistration.backgroundFetch.fetch(
"download-movie",
["/my-movie-part-1.webm", "/my-movie-part-2.webm"],
{
icons: movieIcons,
title: "Downloading my movie",
downloadTotal: 60 * 1024 * 1024,
label: "Downloading a show",
},
);
// â¦
}
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