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

This is awesome, my only input here is to kindly ask to remember not to implement this behaviour for when elements cross realms (such as when an element is being reparented under a different document than its current one).

I believe this was referred in the descritpion:

> "Not allowing atomic moves across documents, which should greatly simplify the security story of this work"

Which is great, just want to emphasize that this is important from the security angle.

Also - cross-document should mean all ways to achieve that, whether by iframe or popups:

```javascript
const child = document.createElement('a');
document.body.appendChild(document.createElement('iframe')).contentDocument.body.append(child);
// OR
open('').document.body.append(child);
```

I assume this is clear already, but thought it's worth mentioning. 

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