Sure! Here's a basic implementation of a billiards game using JavaScript within a single HTML file:
This code sets up a canvas element with a size of 400x800 pixels and uses JavaScript to animate a billiard ball moving within the canvas. The ball starts at position (200, 200) and moves with a speed of 2 pixels per frame in both the x and y directions. Whenever the ball reaches the borders of the canvas, it bounces back in the opposite direction.
You can customize and enhance this basic game by adding game logic, controls, multiple balls, pockets, and other features as needed.