I'm not sure I still have source code for FNAF: Purgatory 2 anymore and it uses a beta build of Godot 3.0, so I'm not sure I would even be able to export it successfully to HTML even if I still had it. I would highly recommend trying FNAF: Final Purgatory if you are interested in something like FNAF: Purgatory 2 but online, as it has a working HTML export and many more features :)