Warning: slightly NSFW.
It won't work when i open it from my local machine. Either by copying the 3 exact source codes and making the picture locations absolute (or else by downloading https://github.com/pa7/nude.js/archive/master.zip).
I think this is because of the browser security restrictions. are you opening the html file from the file system, instead of serving it from localhost? or are you referencing resources from another domain that does not have CORS enabled? Debugging with the console should help.