Re: [whatwg/dom] Declarative Shadow DOM (#510)

Thanks. Regarding 1, I checked the usage of `<shadowroot>` via [httparchive](http://httparchive.org/).
The usage is zero, as of now.

The query is:
```
 SELECT page, count(*)
 FROM [httparchive:har.2017_09_01_chrome_requests_bodies]
 WHERE REGEXP_MATCH(body, r'<shadowroot>')
 GROUP BY page
```

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