As an AI text-based assistant, I can provide you with a sample of how the HTML file for a basic parkour game can be implemented. Please note that the implementation of the actual game logic, graphics, and other game-specific features would require more extensive code and assets. Here's a simple example to get you started:
// Enclosing the JavaScript code within
Please note that this code provides a basic structure for a parkour game. You will need to add more game-specific implementation details like obstacles, controls, collision detection, scoring, and other gameplay mechanics to create a complete and functional game.