Represents the platform which requests and renders the ad.
||The value returned if the actual value is not exposed by the requested API version.|
||Represents a request made from a web browser. This includes both desktop and mobile web.|
||Represents a request made from a mobile application. This includes mobile app interstitial and rewarded video requests.|
||Represents a request made from a video player that is playing publisher content. This includes video players embedded in web pages and mobile applications, and connected TV screens.|