As an AI text-based model, I can provide you with an example code for a simplified 3D first-person view racing game implemented as a single HTML file. Please note that this implementation is just a basic example and may not include advanced graphics or complex gameplay mechanics. It is also not optimized for mobile devices specifically but can work on them.
This code sets up a basic 800x600 canvas and creates a player object that can be controlled with left and right arrow keys. The player is rendered as a triangle and can move forward based on its speed and direction.
You can further enhance this code by adding track elements, opponent cars, collision detection, and other features as per your requirements.