Re: [webcomponents] Disallow attachShadow(...) for some elements. (#110)

As things stand, WebKit's implementation is not going to even define a custom SVG element in v1 (we'll only support direct inheritance from HTMLElement and other custom elements).  We're taking baby steps and ensuring interoperable behavior across browsers instead of trying to address all uses cases in v1.

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https://github.com/w3c/webcomponents/issues/110#issuecomment-180642629