Sure, here is an example of a simple billiards game implemented as a single HTML file using JavaScript. The game is designed for smartphone operation and uses pictograms as visuals.
This HTML file sets up a canvas element where the billiards game is rendered. The ball is represented as a filled circle using the `drawBall` function, and its position is updated in the `update` function. The game loop is started by calling the `startGame` function, which updates the canvas every 10 milliseconds.
You can try running this HTML file in a web browser (e.g., Chrome, Firefox) to see the billiards game in action. Note that this is just a basic implementation and does not include gameplay mechanics or interactions with other objects.