NetworkInformation.downlinkMax

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.
Draft Initial definition

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 61Edge No support NoFirefox No support NoIE No support NoOpera Full support 48Safari No support NoWebView Android Full support 50Chrome Android Full support 38Edge Mobile ? Firefox Android No support NoOpera Android Full support 37Safari iOS No support NoSamsung Internet Android ?

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.

Document Tags and Contributors

Contributors to this page: fscholz, jpmedley, chrisdavidmills, teoli
Last updated by: fscholz,