Re: [whatwg/dom] Proposal: a DocumentFragment whose nodes do not get removed once inserted (#736)

> The context you're missing is https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Template-Instantiation.md and some F2F discussion (probably somewhere in minutes linked from issues in that repository) that encouraged making the parts there true primitives instead of tightly coupled with templating.

Thank you, I'm glad I read the second part of that comment about true primitives. I had read that proposal before and admittedly a little terrified that the DOM spec would include such an opinionated implementation. That spec reads like designing a render framework. I mean I'm sure we could do worse, but I'm encouraged to know that simpler proposals are under consideration.

What I like about this proposal is the transparent use with Node API's appendChild/removeChild since it can be treated interchangeably with actual DOM nodes when say returned from some sort of Template instantiation. 

I think ownership is the challenge with a lot of value comes from having a clear single ancestor(whether single node or fragment). It lets JS context be tied to specific parent nodes without making more elements in the DOM. But by their very nature I don't see how you'd avoid nesting. Like a loop over these fragments with a top level conditional in it that also returns a fragment. In the end the DOM structure would be pretty flat but you'd have persistent fragments in persistent fragments. Since they aren't part of the actual rendered tree it becomes harder to understand what falls under each since nested dynamic content in this case could change what is in the top fragment. I would absolutely love to see a solution in this space having spent a lot of time figuring out tricks to accomplish similar things. Everyone writing a render library where they don't virtualize the tree hits this issue sooner or later.  

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