Re: [w3ctag/design-reviews] Declarative Shadow DOM (#494)

`delegatesFocus` may not be the last option that gets added to [ShadowRootInit](https://dom.spec.whatwg.org/#dictdef-shadowrootinit), and this implies that we need to add a `shadowrootfoo=""` attribute to `<template>` for every boolean we add to ShadowRootInit. That seems kinda messy. Could we maybe have a single `shadowrootoptions` content attribute containing a DOMTokenList representing these boolean flags?

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