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The nice thing about dommy (github.com/prismatic/dommy) is that emacs doesn't need to be changed at all to use it. It's just clojure and all the highlighting and the emacs major mode work.

Also out of the box, you get a repl to live test and evaluate template functions and data structure. It would only take a few lines of emacs lisp to take a string from the repl and pipe it through XHTML validation.

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In terms of performance, wouldn't it be far faster to use strings and turn those into document fragments or setting innerHTML? I've been looking at ways to make crate much faster and it seems that would be the fastest solution by far.

That's the approach Hiccups took, it goes as far as generating most of the html at compile time as well. I didn't run benchmarks but I would guess it is faster than crate in some situations (huge fragments, older browsers etc).

Another plus is nodejs compatibilty (if you care about that, but I guess you might :)).

https://github.com/teropa/hiccups

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