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

I don't know what you mean by "handy".  There is nothing special about `div` and `span` compared to unknown elements except that `div` and `span` will have a different interface name and they have default style rules for `display`.

We don't want to encourage authors to start writing pages with a bunch of div's and span's just in the case they may want to later attach shadow DOM on those elements.

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