This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
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 doublerepresenting 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 | 48.0 | No support | No support | No support | No support |
| Feature | Android | Android Webview | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | No support | No support | No support | No support | No support | 48.0 |
| Available in workers | (Yes) | No support | No support | No support | No support | No support | (Yes) |