Re: [whatwg/dom] Allow attachShadow on <script> and <style> (Issue #1064)

Both of these elements have special associated [tokenizer states](https://html.spec.whatwg.org/#script-data-state) that would collide with the declarative syntax for shadow root. They also have existing initialization/change behaviors. For script in particular it seems like this use case, though cool, is probably not sufficient to justify a relatively high risk of introducing novel security issues and xss opportunities.

FWIW, it is possible currently to create novel contracts around elements like this. For example one can have a custom element whose that has a slot that expects a script element as its child or which places one in the shadow itself.

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