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 the compatibility 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 non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
If needed, you can determine whether or not this constraint is supported by checking
the value of
MediaTrackSupportedConstraints.volume as returned by a call
MediaDevices.getSupportedConstraints(). However, typically this is
unnecessary since browsers will ignore any constraints they're unfamiliar with.
ConstrainDouble describing the acceptable or required value(s) for an
audio track's volume, on a linear scale where 0.0 means silence and 1.0 is the highest
If this value is a number, the user agent will attempt to obtain media whose volume is
as close as possible to this number given the capabilities of the hardware and the other
constraints specified. Otherwise, the value of this
guide the user agent in its efforts to provide an exact match to the required volume (if
exact is specified or both
provided and have the same value) or to a best-possible value.
Any constraint set which only permits values outside the range 0.0 to 1.0 cannot be satisfied and will result in failure.
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