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

Option B is obviously using the wrong methods though ... a disconnected fragment (which is all fragments) that uses `moveBefore` makes no sense ... I'd rather have that method overridden with a throwing for `DocumentFragment` class but I understand that case could be true for any offline node too (if I understand this API correctly) ... although, we have:

```js
if (parent.isConnected)
  parent.moveBefore(node, ref_node);
else
  parent.insertBefore(node, ref_node);
```

AFAIK that's not the end of the story though, the operation can fail in other occasions too ... the accessor I've mentioned also wouldn't work, a method such as `parent.canMoveNode(node)` would be better, still without any need to throw on `moveBefore` as your use case is probably the edge one, not the most common one, for when `moveBefore` is desired imho.

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