As an AI language model, I can provide you with a basic framework for creating a simple racing game using HTML and JavaScript. Please note that the provided code won't replicate a realistic racing experience like Forza Horizon, but it can serve as a starting point for further development. Here's an example implementation:
Racing Game
This code sets up a basic racing game where you can control a car's movement using left and right buttons represented by arrow pictograms. The racing track is a fixed size container, and the red-colored car can move horizontally within the boundaries of the track.
It's important to note that this implementation is just a starting point and lacks advanced features, such as opponent cars, multiple tracks, scoring, etc. To create a more realistic racing game like Forza Horizon, you would need to incorporate more advanced game development techniques, 3D graphics, physics simulation, and possibly game development frameworks or libraries.