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.



Public discussion

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 89
  • Chrome for Android release 89

Consensus & Standardization

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

  • Positive
  • No signal
  • No signal
  • Positive


Intent to Prototype url

Intent to Prototype thread

Search tags

COOP, COOP reporting,

Last updated on 2021-05-19