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.
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

Document Tags and Contributors

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