web api instance property
MediaTrackSupportedConstraints: latency property
The MediaTrackSupportedConstraints dictionary’s latency property is a read-only Boolean value which is present (and set to true) in the object returned by 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!";