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

As long as we're adding `:host {display: block;}`, why don't we add `:host, :host * {box-sizing: border-box;}` too? That's what everybody wants, right?

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https://github.com/w3c/webcomponents/issues/224#issuecomment-193897509