Sure! Here's an example of a simple endless runner game in a 3D third-person perspective using JavaScript and HTML. The game will be playable on a smartphone and will feature pictograms for visual elements.
In this example, the game area is represented by a `<div>` with the id "game". The player's character is a blue square with the id "player" that can be moved left or right by touching the left or right half of the game area on a smartphone. The `gameLoop` function will handle the game logic and is called repeatedly using the `requestAnimationFrame` method.
Please note that this is a very basic implementation and you can add more features and elements to the game as per your requirements.