See reflex-dom-lazy-grid.
There is a simple build script provided that will use stack to install GHCJS if needed and then build the project:
./build.sh
You may want to adjust compiler version first if you already have GHCJS installed. Will save an hour or two...
Refer to stack documentation.
The build script copies all the necessary files to the serve directory. If your system has python3 available just:
cd serve && python3 -m http.server 8080
Finally visit: http://localhost:8080