[mutagen]

I'm curious about this as well so I did some searching.

Fay[1], a subset of Haskell that compiles to JavaScript, seems to be the primary choice. There are DOM and jquery bindings for it and this blog post[2] looks like a great introduction.

There are other options, this [3] article outlines a number of them as a greater overview of both server and client side programming with Haskell. I also found an intriguing article [4] on the Haskell site but it appears to be out of date, referencing libraries that are no longer in development.

[1]https://github.com/faylang/fay/wiki

[2]http://ocharles.org.uk/blog/posts/2013-12-23-24-days-of-hack...

[3]http://www.stephendiehl.com/posts/haskell_web.html

[4]http://www.haskell.org/haskellwiki/Haskell_in_web_browser