Re: [WICG/webcomponents] Need a callback for when children changed or parser finished parsing children (#809)

@keithamus also worth mentioning that *if* the DOM would expose a *generic* `Element.prototype.whenParsed(callback)` API all our issues could be solved in every possible user-land library or use case.

That method would indeed be:

  * easy to use on any Custom Element constructor
  * not confine the feature to Custom Elements only, as these are already problematic due browsers diversions around the builtin extend topic
  * provide a primitive for every non custom elements based library out there (majority of the current market share)

So, if your idea was a proposal for an API, I'd be plus one on that too!

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