Re: [whatwg/dom] Use "NotSupportedError" when trying to attachShadow() twice (#761)

Bugs:

- https://bugs.chromium.org/p/chromium/issues/detail?id=963920
- https://bugs.webkit.org/show_bug.cgi?id=197948
- https://bugzilla.mozilla.org/show_bug.cgi?id=1552198

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Received on Thursday, 16 May 2019 15:19:28 UTC