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

> Yep, totally fair. Ok, I’ll make that change. How do you feel about using properties on DOMParser and XMLHttpRequest?

It'd be better to use an options argument for DOMParser IMO.

For XHR, I can't see anywhere nice to slot it in, and everything uses properties anyway. Although maybe you'd want it to be `.responseType = "document-allowing-shadow-trees"` instead of `.responseType = "document"` and then a `allowShadowRoot` property that only works when `responseType === "document"`? I dunno, that API is so terrible anyway. An alternative would be just never allowing DSD with XHR since we've generally been trying to avoid adding features to XHR; maybe @annevk has thoughts there.

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