Re: [whatwg/dom] Custom element callback/promise for "connected and parsed" (#662)

@Jamesernator 

> Just defer the customElements.define call until DOMContentLoaded

Imo that's a bad idea for at least two reasons:

a) it won't solve problems related to dynamic creation/updating of element via e.g. morphdom,
and, even more important,
b) it will disallow for people using your components to register their own listeners which they'd usually do on `DOMContentLoaded`.

That would introduce a mess of `customElements.whenDefined()` callbacks (where all the consumer of the components usually wants is a `webcomponentsReady()` callback mechanism).

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