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This PR implements a new COOP value, "popups". This value is quite unique in the sense that it is the first possibility to maintain a limited opener across Browsing Context groups. This is used to provide both crossOriginIsolated and interaction via postMessage and closed for popups.
Issue about having crossOriginIsolated on pages that interact with popups #6364
Issue about having openers between BrowsingContext groups #7713
See the explainer for more details.
At least two implementers are interested (and none opposed):
Tests are written and can be reviewed and commented upon at:
Implementation bugs are filed:
(See WHATWG Working Mode: Changes for more details.)
/acknowledgements.html ( diff )
/browsers.html ( diff )
/origin.html ( diff )
/window-object.html ( diff )