MediaTrackSupportedConstraints: volume property
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see thecompatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
TheMediaTrackSupportedConstraints dictionary'svolume property is a read-only Boolean value which ispresent (and set totrue) in the object returned byMediaDevices.getSupportedConstraints() if and only if theuser agent supports thevolume constraint. If theconstraint isn't supported, it's not included in the list, so this value will never befalse.
You can access the supported constraints dictionary by callingnavigator.mediaDevices.getSupportedConstraints().
Value
This property is present in the dictionary (and its value is alwaystrue)if the user agent supports thevolume constraint. If the property isn'tpresent, this property is missing from the supported constraints dictionary, and you'llgetundefined if you try to look at its value.
Examples
<div></div>#result { font: 14px "Arial", sans-serif;}const result = document.getElementById("result");const supported = navigator.mediaDevices.getSupportedConstraints().volume;result.textContent = supported ? "Supported!" : "Not supported!";