This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage 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 specification changes.
RTCSessionDescription.type is a read-only value of type
RTCSdpType which describes the description's type.
var value = sessionDescription.type; sessionDescription.type = value;
The possible values are defined by an enum of type RTCSdpType.
The allowed values are those of an enum of type
"offer", the description is the initial proposal in an offer/answer exchange.
"answer", the description is the definitive choice in an offer/answer exchange.
"pranswer", the description is a provisional answer and may be changed when the definitive choice will be given.
rollback", the description rolls back to offer/answer state to the last stable state.
// The remote description has been set previously on pc, a RTCPeerconnection alert(pc.remoteDescription.type);
|WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'RTCSessionDescription.type' in that specification.
|Working Draft||Initial specification.|
|Feature||Chrome||Edge||Firefox (Gecko)||Internet Explorer||Opera||Safari|
|Basic support||(Yes) ||(Yes)||(Yes) ||No support||(Yes)||?|
|Feature||Android||Chrome for Android||Edge||Firefox Mobile (Gecko)||IE Mobile||Opera Mobile||Safari Mobile|
|Basic support||?||?||(Yes)||?||No support||?||?|
 Though this property is not prefixed, the interface it belongs to is.