Re: [w3c/webcomponents] How can a custom element detect when it is transcluded into a shadow tree (slotchange)? (#504)

> It's like if someone took me and blindfolded me then placed me in the trunk of a car, I wouldn't be able to see anything, but I'd still know I was getting moved (distributed) to somewhere. If the tree is open, then slot is the reference to the slot element (they put me in the trunk without blindfold).

Hah! Yeah, but would that be much different than using `conenctedCallback()` and `assignedSlot` even if it was `null`? When you're connected, you're distributed somewhere whether it's a `<div>` or a `<motor-scene>`. A `<div>` is essentially a custom element with a closed shadow root, even if it's not implemented that way at the browser level.

Another way of looking at this might be:

```js
connectedCallback () {
  this.distributedCallback(this.assignedSlot);
}
```


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