Adds a reporting API to help developers deploy cross-origin opener policy.


We want to provide a reporting API for cross-origin opener policy (COOP) to help developers deploy it on their websites. In addition to reporting breakages when COOP is enforced, we want to provide a report-only mode for COOP. The report-only mode for COOP will not enforce COOP, but it will report potential breakages that would have happened had we enforced COOP.



Specification link

Specification being incubated in a Community Group

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.

  • Positive
  • No signal
  • Positive


Intent to Prototype url

Intent to Prototype thread

Search tags

COOP, COOP reporting,

Last updated on 2021-12-13