Re: [w3ctag/design-reviews] Deprecating `document.domain`. (#564)

The biggest difference is the effect on subframes; keeping it in Permissions Policy means that any page which disables it will necessarily disable it in all of its embedded frames as well (with no warning to or opt-in needed from those frames)

Switching to Document Policy would mean that each frame could (generally) set this bit independently from the others. Any requirements imposed by embedding frames would require an explicit opt-in from the embedded page.

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