Re: [whatwg/dom] Declarative Shadow DOM (#831)

> 3. quickly verify that the SSR HTML matches the client-side vDOM (e.g. by computing a hash code of the SSR vDOM and storing it in the HTML, then checking that hash code against the hash code of the CSR vDOM)

@dfabulich, thanks for the post. That made me understand the disconnect here. The point is that this proposal is **not** for a **full SSR system**. This proposal is for a necessary, low-level **primitive** that would be required for any Shadow-DOM-based SSR system. I'm not trying to solve your item 3 - that can be done a number of ways, and I'm not trying to propose a platform-standard way of diffing content. I suggested two *trivial* but *non-optimal* ways to do this: 1) always assume the SSR content matches and don't re-create anything, or 2) always assume it doesn't match and re-create it all. Clearly there are smarter, but more complex, solutions that can be provided by SSR frameworks. But no matter what the solution, there needs to be a declarative (no-JS) way to create a `#shadowroot` in the SSR content. That's what this proposal is all about.


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