Sure, here's an example of a simple Mario Kart game implemented as a single HTML file using JavaScript:
This is a basic implementation of a Mario Kart game where you can control a player represented by a rectangle using the arrow keys on your smartphone. The player can move within the boundaries of the canvas (800x600) and the game loop continuously updates and renders the game.
Please note that this is just a minimal example to demonstrate the concept. A complete Mario Kart game would require much more functionality, including tracks, opponents, power-ups, and more advanced rendering techniques.