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Forget the editor, what I'd like is a browser that reloaded the DOM every time it saw that a source file change.

You can do this with livereload: http://livereload.com/

Grunt has a live reload plugin that is fairly easy to set up

I'm not sure that's really how it works though, right? It does an actual refresh of the page which is no good if you have lots of state. See my comment about (my) chromesymc above.

https://github.com/aidos/chromesync

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