A web server is currently required to serve LZX autoincludes, as it satisfies the same-origin policy. Any simple web server will do, here's a one liner that works in most cases:
python -m SimpleHTTPServer
Once the server is running, visit http://localhost:8000/data.html
This is only required when editing the coffeescript core.
coffee -j layout.js -mo ./ -cw *.coffee