NetworkInformation: downlink property

Limited availability

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

Note: This feature is available in Web Workers.

The downlink read-only property of the NetworkInformation interface returns the effective bandwidth estimate in megabits per second, rounded to the nearest multiple of 25 kilobits per seconds. This value is based on recently observed application layer throughput across recently active connections, excluding connections made to a private address space. In the absence of recent bandwidth measurement data, the attribute value is determined by the properties of the underlying connection technology.

Value

A number.

Specifications

Specification
Network Information API
# dom-networkinformation-downlink

Browser compatibility

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
downlink
Chrome – Full support
Chrome 61 (Release date: 2017-09-05)
footnote
footnote The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.
Edge – Full support
Edge 79 (Release date: 2020-01-15)
footnote
footnote The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 48 (Release date: 2017-09-27)
footnote
footnote The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.
Safari – No support
Safari
footnote No support
Chrome Android – Full support
Chrome Android 38 (Release date: 2014-10-08)
footnote
footnote The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – Full support
Opera Android 25 (Release date: 2014-10-16)
footnote
footnote The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – Full support
Samsung Internet 3 (Release date: 2015-04-10)
footnote
footnote The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.
WebView Android – Full support
WebView Android 50 (Release date: 2016-04-13)
footnote
footnote The value is never greater than 10 Mbps, as a non-standard anti-fingerprinting measure.
WebView on iOS – No support
WebView on iOS
footnote No support

Legend

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

Full support
Full support
No support
No support
See implementation notes.

See also