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RTCPeerConnection: iceGatheringState property - Web APIs | MDN
The possible values are:
new
The peer connection was just created and hasn't done any networking yet.
gathering
The ICE agent is in the process of gathering candidates for the connection.
complete
The ICE agent has finished gathering candidates.
If something happens that requires collecting new candidates, such as a new interface being added or the addition of a new ICE server, the state will revert to gathering to gather those candidates.
const pc = new RTCPeerConnection();
const state = pc.iceGatheringState;
