If you want to access your files on your own server CORS headers are required. enable cross-origin resource sharing explains what you have to do.
It's also possible to read files from your local device. Just drop the file on the empty white space on the page. Currently this feature only works with Chrome.
Zooming and scrolling doesn't work with the Canvas fallback renderer. If these features don't work on your machine you may find help on this page.
RawDevJS uses the following libraries: