Sure, here's an example of a simple billiards game implemented in a single HTML file using JavaScript:
In this example, we have a billiards game with a single red ball bouncing around the canvas. The `drawBall` function is responsible for drawing the ball on the canvas, and the `draw` function is called repeatedly to update the ball's position and redraw it.
Please note that this is a very basic implementation and does not include any game logic or interactions. It's just a starting point for a billiards game, and you can build upon it by adding features like cue sticks, other balls, pockets, and more.