Re: [whatwg/fullscreen] Consider forbidding <frame> element from entering fullscreen (#112)

fred-wang left a comment (whatwg/fullscreen#112)

> 3\. > Fullscreen inside of `<frame>` should have been forbidden by the "allowed to use" algorithm anyway.
>         
>         Right, but it [used to work](https://chromium.googlesource.com/chromium/src/+/32a059337eb1c538242091adc170c41be325443b), is all, which just means that whatever the problem is in Gecko probably doesn't apply to Chromium. I'm still fine with not allowing it.

It seems this relies on Permissions-Policy, but I don't see where it forbids document in frame specifically.

I was looking at this old WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=95402

And "fullscreen inside a frame" works in Safari https://people.igalia.com/fwang/webkit-bug-95402/frameset.html (served with `Permissions-Policy: fullscreen=*`) but not in Firefox or Chrome.

The following "fullscreen inside an iframe" works in the three browsers: https://people.igalia.com/fwang/webkit-bug-95402/iframe.html (again served with `Permissions-Policy: fullscreen=*`).


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