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

> In general shared mutable global state is problematic and makes code harder to reason about. E.g., you can set it, then call a framework method which isn't prepared to deal with the consequences.

This concern could be discharged by adding a method `allowDeclarativeShadowDOM` setting a flag which is automatically unset after each task.

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