ServiceWorkerRegistration: backgroundFetch property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

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.

Value

Examples

Initiating a background fetch

The following code accesses the backgroundFetch property and uses it to initiate a background fetch operation.

js
// 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",
    },
  );
  //...
}

Specifications

Specification
Background Fetch
# dom-serviceworkerregistration-backgroundfetch

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
backgroundFetch
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.