Adds rollback, which is a way to cancel an on-going negotiation. This is needed if two WebRTC endpoints attempt to send an offer at the same time. In this case, one of the endpoints has to cancel its local offer by rolling back so that it can accept the incoming offer. This lets it complete the remote negotiation then create a follow-up offer after it becomes stable. Without it, negotiation cannot complete.


This is part of "Perfect Negotiation", which makes signaling in WebRTC race-free and less error-prone. For more details, see



Specification link

Unknown standards status - check spec link for status

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

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

  • Shipped/Shipping
  • Shipped/Shipping
  • No signals


Last updated on 2021-12-13