Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
The MediaTrackSupportedConstraints
dictionary's
volume
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 volume
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
volumeConstraintSupported = supportedConstraintsDictionary.volume;
Value
This property is present in the dictionary (and its value is always true
)
if the user agent supports the volume
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().volume) {
result.textContent = "Supported!";
} else {
result.textContent = "Not supported!";
}
Result
Browser compatibility
BCD tables only load in the browser