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Automatic update from web-platform-tests [Partitioned Popins] Limit cross-origin popin opener access This CL mirrors the COOP restrict-properties work to prevent the use of the opener proxy for/by a popin for any actions other than postMessage() or closed. The difference between https://chromium-review.googlesource.com/c/chromium/src/+/5800429 and this CL is that enforcement is limited here to cross-origin cases. There will be enforcement of same-origin cases in a future CL, but we will not enforce it as a security boundary (independent process) for now. All of this work is behind an experimental flag "PartitionedPopins" so will not be enabled by default. Explainer: https://explainers-by-googlers.github.io/partitioned-popins/ I2P: https://groups.google.com/a/chromium.org/g/blink-dev/c/ApU_zUmpQ2g/ Bug: 340606651 Change-Id: I5a852fc2f598e311142a25a434656592fe9185a3 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5854082 Auto-Submit: Ari Chivukula <arichiv@chromium.org> Reviewed-by: Daniel Cheng <dcheng@chromium.org> Reviewed-by: Rakina Zata Amni <rakina@chromium.org> Commit-Queue: Rakina Zata Amni <rakina@chromium.org> Cr-Commit-Position: refs/heads/main@{#1354277} -- wpt-commits: 3a73b22199a61a711bdeed49f58720529851a467 wpt-pr: 48110
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