This project should be executable as-is, from any web server, without any additional setup. Depending on your web browser, it may even be possible to run it completely from a local directory without using a web server at all. Just open the index.html file in your web browser. This works (at least) in Firefox. Chrome/ Chromium on the other hand block file access from local files, and thus prevents loading of the shader code. To compensate, either start a minimal web server to serve the files, or start Chrome/Chromium with the "--allow-file-access-from-files" parameter.