Re: [w3c/webcomponents] When is `slotchange` handler fired? (#515)

@rniwa How can a distributed node then run some code after `slotchange` handlers have fired without knowing about slotchange? If `slotchange` fired in the same tick as the custom element callbacks, then the simple solution is deferring to the next tick. 

I would really like to detect when the tree looks like this:

```
div
 |
slot
 |
motor-node
```

and I need that distributed `motor-node` to throw an error when it is distributed into a `div`.

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