Sure! Here's a simple tank battle game implemented as a single HTML file using JavaScript:
This implementation sets up a canvas element where the tank and the gameplay will be displayed. The tank is represented as a rectangle (`ctx.fillRect()`) and is controlled using the left and right arrow keys. The tank can move left and right within the boundaries of the canvas.
Please note that this is a basic implementation of a tank battle game and can be further expanded upon to include features like enemy tanks, bullets, levels, and scoring.