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.type;
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. |
Editor's Draft | Initial definition |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | No support | No support | No support | No support | No support |
Available in workers | No support | No support | No support | No support | No support |
Feature | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | 50 | 38 | No support | No support | 37 | No support |
Available in workers | 50 | 38 | No support | No support | 37 | No support |