To test your HTML5 app, you will need to upload the entire folder to your web server and access that folder through your HTML5 compatible browser. Due to JavaScript security restrictions, HTML5 builds only work if they are served from a web server.
If you have Python installed you can test locally by starting a web browser on your computer and accessing your HTML5 build folder in your browser. The easiest way to get it served on macOS is to drag your build folder on to Terminal.app then paste
python -m SimpleHTTPServer
into the terminal window. Then open http://localhost:8000/index.html in you web browser. For Windows, with Python installed, run cmd.exe and then use the cd command to change directories to your build folder and run the same Python command and then open your browser to the above URL. If you need to see the console log, please open http://localhost:8000/index-debug.html instead.
Please post questions about HTML5 here.
Rob