{"json_modified": "2016-10-19T12:27:09.054860", "uuid": "3b740784-1dcd-40dc-83bb-a59b54e7f881", "title": "MediaTrackControls.volume", "url": "/en-US/docs/Web/API/MediaTrackConstraints/volume", "tags": ["API", "Volume", "WebRTC", "Reference", "Constraints", "Property", "Media Streams API", "Audio", "getusermedia", "MediaTrackConstraints", "Media Capture and Streams API", "Media", "audio"], "translations": [], "modified": "2016-10-19T12:27:09", "label": "MediaTrackControls.volume", "localization_tags": [], "locale": "en-US", "id": 196759, "last_edit": "2016-10-19T12:27:03", "summary": "The <a href=\"/en-US/docs/Web/API/MediaTrackConstraints\" title=\"The MediaTrackConstraints dictionary is used to describe a set of capabilities and the value or values each can take on. A constraints dictionary is passed into applyConstraints() to allow a script to establish a set of exact (required) values or ranges and/or preferred values or ranges of values for the track, and the most recently-requested set of custom constraints can be retrieved by calling getConstraints().\"><code>MediaTrackConstraints</code></a> dictionary's <code><strong>volume</strong></code> property is a <a href=\"/en-US/docs/Web/API/ConstrainDouble\" title=\"The ConstrainDouble type is used to specify a constraint for a property whose value is a double-precision floating-point number. It extends the DoubleRange dictionary (which provides the ability to specify a permitted range of property values) to also support an exact value and/or an ideal value the property should take on. Additionally, you can specify the property's value as a simple floating-point value, in which case the user agent does its best to match the value once all other more stringent constraints are met.\"><code>ConstrainDouble</code></a> describing the requested or mandatory constraints placed upon the value of the <a href=\"/en-US/docs/Web/API/MediaTrackSettings/volume\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>volume</code></a> constrainable property.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Value", "title": "Value"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/MediaTrackConstraints/volume", "review_tags": []}