Re: [webcomponents] Shadow dom: use css containment features by default (#355)

Can you clarify what the second piece would be?  If it's just formatting context, that's fairly easy - implement the Display spec, then default custom elements to `display: flow-root;` (that's display:block + formatting context).  Authors can change it back to `display:block` if they want.  (Or use `flex` or `grid`, which are formatting contexts automatically.)

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