If you build sites, or applications, or anything related to the web, you have 3 main choices:

You can build static files locally, but your path will look something like file:///Users/xxx/Documents/Projects/xxx/Header:Footer%20(FF)/Mock/index.html (mac)
You can develop online, and you’ll get a path like http://www.xxx.com/project/index.html (if you use your own domain, or go in stealth mode and build on [...]