Re: [WICG/webcomponents] Functionally complete declarative templating (Issue #997)

Apologies, @sashafirsov , for jumping to the conclusion that I was addressing similar concerns as you with my POC link.  I think I latched on to the little piece of your proposal that I thought I understood, without grasping the larger context.

On a closer reading of your proposal, I *think* you are proposing something quite novel, with your desire to share a common reference to a template DOM node -- you envision being able to create something like "symbolic links" for DOM nodes, so that multiple DOM nodes that appear throughout the document can be "shared"?  If I programmatically alter one "instance", it affects them all, because they are all one instance, really?  If I'm understanding that correctly (probably not), that does seem like it could provide some radical performance improvements (but seems like a rather deep change with how the DOM works, but I'm no expert on that question).

For the record, I jumped to the conclusion that this proposal was  a bit less ambitious -- just laying out a formal mechanism for including HTML content from an external source.   Within that context, the reason **I** think supporting having a separate template element that can be used to coordinate a client-side include (but ideally, the other link I provided, where the src/href is attached to the actual element where the include happens, would also be supported) is far more mundane -- I think it could make the decision whether to bundle or not to bundle much less of an ordeal going back and forth, in some scenarios where that question makes sense (in particular, when multiple DOM  nodes are instantiated from the same template).  So I agree, we were discussing apples and oranges.  

Anyway, thanks for presenting your ideas.

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