Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The downloaded read-only property of the BackgroundFetchRegistration interface returns the size in bytes that has been downloaded, initially 0.
If the value of this property changes, the progress event is fired at the associated BackgroundFetchRegistration object.
A number.
Logging this property to the console returns the number of bytes downloaded.
js
console.log(bgFetch.downloaded);
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
downloaded |
74 | 79 | No | No | 62 | No | No | 74 | No | 53 | No | 11.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/BackgroundFetchRegistration/downloaded