This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The NetworkInformation.downlinkMax
read-only property returns the maximum downlink speed, in megabits per second (Mbps), for the underlying connection technology.
Note: This feature is available in Web Workers.
Syntax
var max = NetworkInformation.downlinkMax
Return value
- an
unrestricted double
representing the maximum downlink speed, in megabits per second (Mb/s), for the underlying connection technology.
Examples
The following example monitors the connection using the change
event and logs changes as they occur.
function logConnectionType() {
var connectionType = 'not supported';
var downlinkMax = 'not supported';
if ('connection' in navigator) {
connectionType = navigator.connection.effectiveType;
if ('downlinkMax' in navigator.connection) {
downlinkMax = navigator.connection.downlinkMax;
}
}
console.log('Current connection type: ' + connectionType +
' (downlink max: ' + downlinkMax + ')');
}
logConnectionType();
navigator.connection.addEventListener('change', logConnectionType);
Specifications
Specification | Status | Comment |
---|---|---|
Network Information API The definition of 'downlinkMax' 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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
downlinkMax | Chrome
Full support
61
| Edge No support No | Firefox No support No | IE No support No | Opera No support No | Safari No support No | WebView Android Full support 50 | Chrome Android Full support 38 | Firefox Android No support No | 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
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- See implementation notes.
- See implementation notes.