Re: [WICG/webcomponents] "open-stylable" Shadow Roots (#909)

> The original idea (this.attachShadow({mode: 'open-stylable'});) would cause FOUC. 

Why is that necessarily the case? This is a script necessary for rendering. Loading such a script after rendering will casuse FOUC, loading it before will not.

This would also work with declarative shadow DOM which does not require script and is therefore not likely to FOUC.

```html
<div>
  <template shadowrootmode="open-stylable">...</template>
</div>
```

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