Re: [whatwg/dom] Add declarative Shadow DOM features (#892)

> @mfreed7 I think that's a mischaracterization of Mozilla's views and seems somewhat unwarranted? We've been plenty supportive of exploring declarative web components. We're just not quite convinced of declarative shadow trees in isolation.

I’m sorry you feel that way! I honestly didn’t mean to mischaracterize anything. (The link to your blog post might not have been fair, I suppose, though it **is** a very public blog post.) But I’ve been working for ~a year trying to gather production performance data on this feature precisely because I thought this was Mozilla’s view. E.g. see the latest comment from @smaug---- on [the issue thread](https://github.com/whatwg/dom/issues/831#issuecomment-988394185), which is talking about performance concerns related to (declarative/all) shadow roots. Since declarative custom elements (which are vaporware at this point) would almost surely build on top of declarative shadow dom, I would think those concerns are shared, no?


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