As we chatted about in the meeting yesterday, it's useful to notify this list when implementations of the various headers are available. lukasza@ recently added support for the Cross-Origin-Resource-Policy header (
https://github.com/whatwg/fetch/pull/733) in Chrome 73.0.3683.0, as part of
https://crbug.com/853723. Feel free to try it out on the current Chrome Canary or tomorrow's Dev channel build.
We're trying to schedule some time to implement Cross-Origin-Opener-Policy next, once we get a moment.