Re: [WICG/webcomponents] CustomEvents Add Event Handler in Html (#908)

> So this is essentially a feature the web component frameworks like lit-html need to support /I need to implement myself?

I suspect so, it doesn't seem hard to implement some sort of base class that does this. The firefox UI uses [similar patterns](https://searchfox.org/mozilla-central/rev/02cb78667e87ccc42fea5edc6f3f2dd2edd6ecd5/toolkit/content/customElements.js#260) for "inheriting" attributes and such.

Making this "magic" is probably a breaking change (though I guess there could be some sort of opt-in at the component registration level...), plus you'd probably also want a `get onmycustomevent()` / `set onmycustomevent()` etc, right? Those are I suspect even more tricky to implement transparently / magically, they need to live somewhere in the proto chain of the element, so making that happen without anything in the class declaration that you use for registration seems a bit hard.

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