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

> Should the overhead we care about be against imperative DOM creation?

That is a separate issue.

Another issue is whether the proposal itself is using fast algorithms or can we do something better. It does seem to do somewhat redundant work by creating template and then later removing it and creating nodes in another document and then adopting them to another document almost immediately.
(It is really puzzling to me why simple performance profiling can't be done. I'd do it myself if I knew something as simple as [https://profiler.firefox.com/](https://profiler.firefox.com/) for Chrome. If you haven't tried that profiler, try it, especially with Nightly if you're interested in browser internals.)

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