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

I'm a month late to the party, but I too am excited about this proposal! For certain scenarios -- especially ones involving an iframe -- the ability to re-root an iframe could vastly improve perceived performance and overall user experience.

For the specific product that I am working on, the specific cases that we are envisioning using this for are:

* Primary use-case: load an iframe invisibly in the background (based on a heuristic of the user eventually needing it) so that when the user clicks on a button to view the iframe, we can swap in the already-loaded iframe much quicker than if we were to load from scratch.
* Secondary use-case: allow moving an already user-visible iframe from one spot in the DOM into another.

Looking forward to seeing this proposal come to life!

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