Sure! Here's an example of an online football game implemented as a single HTML file using JavaScript:
In this game, the players are represented by pictogram images (`emozi_all/game.png` and `emozi_chicken.png`) and the ball by another image (`emozi_all/ball.png`). The game canvas is displayed where the players and ball will be moving. The game loop continuously updates the game state, moves the players and ball, and renders them on the canvas.
Please note that this is a simplified example and does not include game logic or multiplayer functionality. It serves as a starting point for implementing an online football game. You would need additional code to handle player input, multiplayer communication, scoring, and other game mechanics.