Sure! Here's a simple implementation of a billiards game as a single HTML file using JavaScript:
This code sets up a simple billiards game with a red ball bouncing inside a canvas element. The ball moves with a constant speed in both the x and y directions and bounces off the walls of the canvas.
You can open this code in a web browser (preferably on a smartphone) to play the game. The ball will keep bouncing indefinitely until the page is closed.
(Note: This is a basic implementation and does not include complex game logic or interaction with other balls or objects. It's meant to provide a starting point for developing a more elaborate billiards game.)