Bug 214548 – Feature Request: Implement the Background Fetch API

• Component: New Bugs
• Status: NEW

[Thomas Steiner]

Spec: https://wicg.github.io/background-fetch/

Article: https://developers.google.com/web/updates/2018/12/background-fetch

Use case: Fetching (as in down- or uploading) content without the page being open.

Example:

```js
navigator.serviceWorker.ready.then(async (swReg) => {
  const bgFetch = await swReg.backgroundFetch.fetch('my-fetch', ['/ep-5.mp3', 'ep-5-artwork.jpg'], {
    title: 'Episode 5: Interesting things.',
    icons: [{
      sizes: '300x300',
      src: '/ep-5-icon.png',
      type: 'image/png',
    }],
    downloadTotal: 60 * 1024 * 1024,
  });
});
```

[Felix Gnass]

We would love to add background fetch to the PWA of German public broadcaster ZDF (https://pwa.zdf.de) so having support for this in Safari too would be highly appreciated.

[Radar WebKit Bug Importer]

<rdar://problem/66086044>