Web/API/NetworkInformation/downlinkMax

This is an experimental technologyCheck 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.effectiveType;

    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 APIThe definition of 'downlinkMax' in that specification.	Draft	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`downlinkMax` Experimental'	Chrome Full support 61 Notes' Full support 61 Notes' Notes' Only supported in Chrome OS	Edge No support No	Firefox No support No	IE No support No	Opera No support No	Safari No support No	WebView Android Full support 50	Chrome Android Full support 38	Firefox Android No support No	Opera Android Full support 45	Safari iOS No support No	Samsung Internet Android Full support 3.0

Legend

Full support: Full support
No support: No support
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.
See implementation notes.': See implementation notes.

NetworkInformation.downlinkMax by Mozilla Contributors is licensed under CC-BY-SA 2.5.