BackgroundFetchRegistration: downloaded 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.

Note: This feature is available in Web Workers.

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.

Value

A number.

Examples

Logging this property to the console returns the number of bytes downloaded.

js
console.log(bgFetch.downloaded);

Specifications

Specification
Background Fetch
# dom-backgroundfetchregistration-downloaded

Browser compatibility

BCD tables only load in the browser