Sure, here's a basic example of a car game implemented as a single HTML file:
This simple car game uses the HTML canvas element and JavaScript to allow the player to control a car using the arrow keys. The car can move up and down within the boundaries of the window. The game loop constantly updates the car's position and redraws it on the canvas.
You can further enhance the game by adding obstacles, scoring, collision detection, and other features based on your requirements.