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RTCConfiguration.offerExtmapAllowMixed is a non-standard option in the RTCPeerConnection’s RTCConfiguration. It was added as transitional property in order to enable a SDP feature that caused breakages with older versions of the WebRTC library (<M70). Old intent to ship: That feature shipped default on in Chrome 89, see the PSA on discuss-webrtc:

Status in Chromium


Enabled by default

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • No signal
  • No signal
  • No signals


Last updated on 2021-04-06