Re: [whatwg/dom] Proposal: moveOrInsertBefore() (Issue #1406)

noamr left a comment (whatwg/dom#1406)

This version is probably sufficient for any practical use (unless you really need the runtime is-element nodeType checks):

```js
function insertOrMoveBefore(parent: Element, child: Element, ref: Node?) {
  if (child.isConnected && parent.isConnected && 
      (child.ownerDocument === parent.ownerDocument)) {
    parent.moveBefore(child, ref);
  else
    parent.insertBefore(child, ref);
}
```

or:
```js
function insertOrMoveBefore(parent, child, ref) {
  try {
    parent.moveBefore(child, ref);
  } catch (e) {
    parent.insertBefore(child, ref);
  }
}
```
Some of the other premutations like moving `CharacterData` are not that interesting if you're anyway falling back to `insertBefore`.

I don't mind having this as part of the platform (and it was discussed before) but the polyfill is perhaps not that bad?

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