Pack the Java project (Mario-AI-Interface) into a runnable jar with eclipse, selecting Play as main class. I set the java compiler as 1.8 when packing jar (right click the project -> properties -> java compiler -> java compliance level).
Run following cmd instructions:
cd [where CheerjP is unziped]
python cheerpjfy.py [path of the jar]
A .jar.js file will be created.
Copy both .jar and .jar.js files into the project root.
Add a html file (See play.html as an example).
Run
Start a web server at the project root. For example, go to project root path and run python -m http.server 8080 or http-server -p 8080 (NPM).
Access the url (e.g. 127.0.0.:8080/play.html) in a broswer.