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

> > By the time the element is visible, it's applied its desired display setting.
> If this is the case then wouldn't that give those inline-block and flex elements a chance to override the pseudo selector?

Well, we're talking about the unresolved/yet-to-be-upgraded elements having a wrong `display` value here.  That is, until the elements get resolved, they would have a wrong `display` value and may end up in undesirable FOC / bad layout.

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https://github.com/w3c/webcomponents/issues/224#issuecomment-193537374