Should <iframe srcdoc>'s referrer policy reflect updates to parent's referrer policy changes after <iframe> creation?

[hiroshige-g]

According to the spec, Yes:
https://html.spec.whatwg.org/multipage/window-object.html#set-up-a-window-environment-settings-object seems to capture parent's referrer policy dynamically.

Chromium and Safari: Yes
Firefox: No
WPT PR: web-platform-tests/wpt#22783

Similar issue in API base URL: #421

I prefer taking a snapshot at creation time, in the context of #4926

[domenic]

@antosart since referrer policy is now in the policy container, this should have a clear answer, right? Can you own (a) reporting back to this thread what that answer is per spec; (b) ensuring we have tests for it, either existing or by working with @hiroshige-g to merge web-platform-tests/wpt#22783 ?

[domfarolino]

The answer is that they do not reflect changes to the parent policy after creation, and we have tests for this: https://chromium-review.googlesource.com/c/chromium/src/+/2919810

[domenic]

Ah, awesome, thanks @domfarolino! Let's close this then.