Re: [w3c/webcomponents] Shadow dom: use css containment features by default (#355)

It sounds like the concrete proposal here is something like adding the following to the UA style sheet

```
:magic-shadow-host-selector-that-even-looks-inside-closed-shadow-roots {
  contain: contents;
}
```

Is that right? Earlier @tabatkins mentioned `display: flow-root; contain: paint;`, but in his latest comment it became `contain: contents;`?

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