Certainly! Here's an example of a simple parkour game implemented as a single HTML file:
In this example, the game involves a player represented by a blue square (pictogram), and an obstacle represented by a red square (pictogram). The player can jump when tapping or clicking the screen, and the obstacle moves towards the player. The player's goal is to avoid colliding with the obstacle. The score is displayed through an alert when the game is over.
Note that the game logic is enclosed within script tags, and the JavaScript code is written in an actual program. The processing is started when the content of the document is loaded. The game can be played on a smartphone by opening the HTML file in a web browser.