Re: [w3ctag/design-reviews] Specification review for fenced frames (Issue #838)

> We're noting that there have been many spec changes since our last comment but no changes to the explainer. Can you please explain what has changed since our previous review and a short explanation of why you made these changes?

Below is the list of all the recent spec changes we've made, along with links to their explainer updates + either links to the GH issues that prompted it or explanations for why we made the changes.

**Send Automatic Beacons Once**
Spec: WICG/fenced-frame#109
Explainer: WICG/turtledove#718
Background: WICG/turtledove/issues/743 (originally raised by adtech partners but I wrote the issue for tracking purposes)

**Serializable Fenced Frames Configs**
Spec: WICG/fenced-frame#111
Explainer: N/a
Background: Supports a use case that involves running an ad auction in a subframe and then postMessaging it to a parent frame to create the actual fenced frame.

**Creative Macros in Fenced Frames Ads Reporting (FFAR)**
Spec: Protected Audience: WICG/turtledove#762
Spec: Fenced Frames: WICG/fenced-frame#113
Explainer: WICG/turtledove#763
Background: WICG/turtledove/issues/477

**Send Automatic Beacons to Every Registered Destination:**
Spec: WICG/fenced-frame#122
Spec: WICG/fenced-frame#129
Explainer: WICG/turtledove#808
Background: WICG/turtledove/issues/826

**Ad Size Macro Substitution**
Spec: WICG/turtledove#801
Explainer: WICG/turtledove#417
Background: WICG/turtledove/issues/312

**Enable Leaving Ad Interest Groups from Urn iFrames and Ad Component Frames**
Spec: WICG/turtledove#880
Explainer: WICG/turtledove#879
Background: Expanding functionality since there wasn't any reason to disallow this in component frames/URN iframes.

**Introduce reserved.top_navigation_start/commit**
Spec: WICG/fenced-frame#130
Explainer: WICG/turtledove#885
Background: WICG/turtledove/issues/822 (originally raised by adtech partners but I wrote the issue for tracking purposes)

**Allow Cross-Origin Subframes to Send Automatic Beacons**
Spec: WICG/fenced-frame#133
Explainer: WICG/turtledove#904
Background: WICG/turtledove/issues/877

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