Below is an example of a simple 3D FPS game implemented using JavaScript and displayed as a single HTML file. Please note that due to the limitations of text-based conversation, the game cannot be fully interactive, but you should be able to understand the main structure and functionality. Here goes:
In this game, the player starts on a plane represented by an image (provide the path to your own plane image) and can move around based on smartphone input (not implemented here). The player's position and viewing angle are updated, and the canvas is cleared and redrawn in each frame to display the movement.
Please note that the actual game logic and functionality are not fully implemented here, so you won't be able to play the game as a finished product. However, this code provides a basic structure that you can build upon to create your own 3D FPS game.