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

Do most of those custom elements have a shadow DOM?  I think I would be okay with making an element with a shadow DOM use `display: block` by default as that would be backwards compatible.

I don't think either `:unresolved` not having the same `display` value or changing `display` value for all elements with `-` in its name is acceptable.

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https://github.com/w3c/webcomponents/issues/224#issuecomment-193652791