This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.
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.
Note that Chrome-based browsers do not conform to the specification, and arbitrarily cap the reported downlink at a maximum of 10 Mbps as an anti-fingerprinting measure. Similar caps exist for the reported latency.
Syntax
var downLink = NetworkInformation.downlink
Value
A double
.
Specifications
Specification | Status | Comment |
Network Information APIThe definition of 'downlink' in that specification. | Draft | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chrome
Full support 61 |
Edge
Full support 79 |
Firefox
No support No |
IE
No support No |
Opera
Full support 48 |
Safari
No support No |
WebView Android
Full support 50 |
Chrome Android
Full support 38 |
Firefox Android
? |
Opera Android
Full support 45 |
Safari iOS
No support No |
Samsung Internet Android
Full support 3.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.'
- Experimental. Expect behavior to change in the future.
NetworkInformation.downlink by Mozilla Contributors is licensed under CC-BY-SA 2.5.