Re: [webcomponents] [Custom Elements]: Custom elements should be display: block by default (#224)

> I don't think that's any more surprising than today where authors don't realize they're inline by default and end up with collapsed or overflowing inlines all over.

I disagree.

> Generally speaking authors completely hide them with :unresolved and only selectively reshow ones where they want to show some content before the upgrade happens. That's pretty exceptional though.

That would result in FOC when those elements are finally defined.  A well behaving web pages should either use `defer` to load all necessary element definitions (before the initial paint), or specify the dimension on each unresolved element to avoid reflow.

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