[whatwg/dom] Extend `attachShadow()` safelist (#571)

We've got requests for:

- [ ] `<a>` / `<area>`: https://github.com/w3c/webcomponents/issues/511
- [ ] `<map>`: https://github.com/w3c/webcomponents/issues/734

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Received on Sunday, 18 February 2018 13:35:52 UTC