NetworkInformation.downlinkMax

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.

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 48.0 Not supported Not supported Not supported Not supported
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support (Yes) Not supported Not supported Not supported Not supported Not supported 48.0

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/networkinformation/downlinkmax