Re: [webcomponents] Enumerate the element names which don't support createShadowRoot(), instead of looking at the binding property (#110)

FYI.

In blink, `<input>` uses an user-agent shadow tree and it supports createShadowRoot(), however, we found that it would be hard to deliver the meaningful result when a user adds an insertion point, `<content>` (or `<shadow>`), in the created author shadow root. As a result, we gave up distributing the contents of a user agent shadow tree into the insertion point.

That means createShadowRoot() *works* for `<input>`, but it wouldn't meet the user-expectation, as of now, unfortunately. :(

AFAIR, `<img>` would be more painful to have a well-defined behavior.
                                                                                                                                                                                                       

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https://github.com/w3c/webcomponents/issues/110#issuecomment-121842229