Re: [whatwg/dom] Atomic move operation for element reparenting & reordering (Issue #1255)

> I don't think we can make this happen automatically based on a content attribute on an iframe. It most certainly needs to be a completely new DOM API.

I am very much open to that, I'm just trying to consider what subtree side-effects are acceptable. That is, if `parent.appendAtomic(connectedDivWithChildIframe)` should preserve the "child iframe" state or not? I think it has to, for the API to be useful at all. But I'm also sympathetic to compat concerns that it might cause a preserving-move to happen on deeply-nested iframes in a subtree built by another application/framework than the one _performing_ the move in the first place. (And maybe that could break things if parts of the app relies on preserving moves _not_ happening on nodes in the subtree).

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