MediaTrackSupportedConstraints: latency property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

See full compatibility

The MediaTrackSupportedConstraints dictionary's latency property is a read-only Boolean value which is present (and set to true) in the object returned by MediaDevices.getSupportedConstraints() if and only if the user agent supports the latency constraint. If the constraint isn't supported, it's not included in the list, so this value will never be false.

You can access the supported constraints dictionary by calling navigator.mediaDevices.getSupportedConstraints().

Value

This property is present in the dictionary (and its value is always true) if the user agent supports the latency constraint. If the property isn't present, this property is missing from the supported constraints dictionary, and you'll get undefined if you try to look at its value.

Examples

<div id="result"></div>

#result {
  font:
    14px "Arial",
    sans-serif;
}

const result = document.getElementById("result");
const supported = navigator.mediaDevices.getSupportedConstraints().latency;
result.textContent = supported ? "Supported!" : "Not supported!";

Result

Specifications

Specification
Media Capture and Streams # dom-mediatrackconstraintset-latency

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`latency` constraint	Chrome – Full support Chrome 59 (Release date: 2017-06-05) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – Full support Firefox 50 (Release date: 2016-11-15) footnote Full support	Opera – Full support Opera 46 (Release date: 2017-06-22) footnote Full support	Safari – No support Safari footnote footnote See bug 169871	Chrome Android – Full support Chrome Android 59 (Release date: 2017-06-06) footnote Full support	Firefox for Android – Full support Firefox for Android 50 (Release date: 2016-11-15) footnote Full support	Opera Android – Full support Opera Android 43 (Release date: 2017-09-27) footnote Full support	Safari on iOS – No support Safari on iOS footnote footnote See bug 169871	Samsung Internet – Full support Samsung Internet 7 (Release date: 2018-03-16) footnote Full support	WebView Android – Full support WebView Android 59 (Release date: 2017-06-06) footnote Full support	WebView on iOS – No support WebView on iOS footnote footnote See bug 169871

Tip: you can click/tap on a cell for more information.

Full support: Full support
No support: No support
: See implementation notes.