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

> I think having registerElement make it become block is fine, you should already be managing FOUC using `:unresolved`.

I don't think that's okay at all.  It misleads author to think `display: block` is always set on custom elements, and it would be rather surprising to realize that it's not when the element had not be upgraded. We don't need any more magical inconsistent behaviors like that on the Web.

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