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Cross-origin opener policy reporting API

Category

Security

Type

New or changed feature

Status

Enabled by default (Chrome 89)

Intent stage

Shipped

Summary

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

Motivation

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.

Standards & signals

• Specification: https://html.spec.whatwg.org/multipage/origin.html#reporting
• Firefox: Closed Without a Position
• Safari: No signal
• Web developers: Positive — Facebook has been successfully using the reporting API in Origin Trial to deploy COOP on their properties.
• Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1059303

Docs: https://github.com/camillelamy/explainers/blob/master/coop_reporting.md

Explainers: https://github.com/camillelamy/explainers/blob/master/coop_reporting.md

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