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

> For example, the situation you described seems to lead to a cross-origin information leak: evil.com can now infer if a frame from victim.com is loaded anywhere in its current process by returning different From-Origin values for its resources and seeing if they render, even if it doesn't have a reference to the victim.com window or its parent.

Interesting. Yes, that is an issue to consider.

> Aside from security concerns, such "action at a distance" may lead to unexpected application failures, and doesn't seem easy to test for or debug.

Agreed. I'm mostly thinking of strict mode as "the big hammer" for cases where a leak is catastrophic and site breakage is tolerable.

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