Re: [whatwg/fetch] From-Origin (#687)

WebKit is working to isolate `window.open` and other contexts with `opener` in a separate as we speak.

Blocking them in `window.open` and `<a target="_blank">` can be a good mitigation for a short term though. I guess the question is whether we should make that behavior optional or mandatory. Or if we should make `From-Origin` imply that, or add yet another header/CSP option to enforce it.

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