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This feature is obsolete.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 MediaTrackConstraints
dictionary's volume
property is a ConstrainDouble
describing the requested or mandatory constraints placed upon the value of the volume
constrainable property.
If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.volume
as returned by a call to MediaDevices.getSupportedConstraints()
. However, typically this is unnecessary since browsers will simply ignore any constraints they're unfamiliar with.
Syntax
var constraintsObject = { volume: constraint }; constraintsObject.volume = constraint;
Value
A 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 supported volume.
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 ConstrainDouble
will guide the user agent in its efforts to provide an exact match to the required volume (if exact
is specified or both min
and max
are 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.
Example
See Example: Constraint exerciser in Capabilities, constraints, and settings for an example.
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
volume | Chrome Full support 59 | Edge Full support ≤79 | Firefox No support No | IE No support No | Opera Full support Yes | Safari ? | WebView Android Full support 59 | Chrome Android Full support 59 | Firefox Android No support No | Opera Android ? | Safari iOS ? | Samsung Internet Android Full support 7.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Non-standard. Expect poor cross-browser support.
- Non-standard. Expect poor cross-browser support.
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.