Re: [whatwg/dom] [Declarative Shadow DOM] How should we build the "opt-in" for fragment parsing of declarative Shadow DOM? (#912)

> allowDeclarativeShadowDom

Should be `allowDeclarativeShadowDOM` per https://w3ctag.github.io/design-principles/#casing-rules

> allow-declarative-shadow-dom sandbox flag

In general I don't think we're adding new sandboxing flags; instead [document policy](https://w3c.github.io/webappsec-permissions-policy/document-policy.html) seems to be the right replacement? That also gives you the right header-based opt-in for the main document, I believe. @clelland would know more.

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