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@Jamessw I am 1000%, yes!
Is that from the Level 1 spec text? You wouldn't happen to be privy to any conversations where this is being pushed forward? 
I was checking out https://kizu.dev/anchor-positioning-experiments/#the-challenge and thought about this haunted alternative: https://codepen.io/Westbrook/pen/BagPwrN?editors=0100 
kizu.devFuture CSS: Anchor PositioningAnchor positioning might be one of the most exciting features coming to CSS. It is currently available under an experimental flag in Chrome Canary, and after playing with it for a bit, I couldn’t stop myself from sharing what I found. In this article, I will show you some of my experiments.