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()
.
Syntax
latencyConstraintSupported = supportedConstraintsDictionary.latency;
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.
Example
HTML content
<div id="result"> </div>
CSS content
#result { font: 14px "Arial", sans-serif; }
JavaScript content
let result = document.getElementById("result"); if (navigator.mediaDevices.getSupportedConstraints().latency) { result.innerHTML = "Supported!"; } else { result.innerHTML = "Not supported!"; }
Result
Specifications
Specification | Status | Comment |
---|---|---|
Media Capture and Streams The definition of 'latency' in that specification. |
Candidate Recommendation | Initial specification. |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
latency | Chrome Full support 52 | Edge Full support ≤79 | Firefox No support No | IE ? | Opera Full support Yes | Safari ? | WebView Android Full support 52 | Chrome Android Full support 52 | Firefox Android No support No | Opera Android Full support Yes | Safari iOS ? | Samsung Internet Android Full support 6.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown