{"json_modified": "2016-10-18T19:37:06.959802", "uuid": "3d508bef-bb06-4b2a-b357-8b455a92c294", "title": "MediaTrackConstraints.groupId", "url": "/en-US/docs/Web/API/MediaTrackConstraints/groupId", "tags": ["API", "MediaTrackConstraints", "WebRTC", "groupId", "Reference", "Constraints", "Property", "Media Streams API", "getusermedia", "Media Capture and Streams API", "Media"], "translations": [], "modified": "2016-10-18T19:37:07", "label": "MediaTrackConstraints.groupId", "localization_tags": [], "locale": "en-US", "id": 196725, "last_edit": "2016-10-18T19:37:01", "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>groupId</strong></code> property is a <a href=\"/en-US/docs/Web/API/ConstrainDOMString\" title=\"The ConstrainDOMString dictionary is used to specify a constraint for a property whose value is a string. It allows you to specify one or more exact string values from which one must be the parameter's value, or a set of ideal values which should be used if possible. You can also specify a single string (or an array of strings) which the user agent will do its best to match once all more stringent constraints have been applied.\"><code>ConstrainDOMString</code></a> describing the requested or mandatory constraints placed upon the value of the <a href=\"/en-US/docs/Web/API/MediaTrackSettings/groupId\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>groupId</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/groupId", "review_tags": []}