This is an experimental technology Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.
The RTCIdentityAssertion interface of the the WebRTC API represents the identity of the a remote peer of the current connection. If no peer has yet been set and verified this interface returns null. Once set it can't be changed.