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.
msPlayToPrimary is a read/write property which gets or
sets the primary DLNA PlayTo device.
This proprietary property is specific to Internet Explorer and Microsoft Edge.
Boolean value set to true indicates that the device is the primary DLNA PlayTo device, otherwise false.