Sure! Here's an example of an idle game implemented as a single HTML file using JavaScript and enclosed in script tags:
In this example, the game is a simple idle clicker game. You can increment your score by clicking the "Click Me!" button, and your score gradually increases automatically over time. The score is displayed on the screen using a `<p>` element.
You can customize and expand upon this basic structure to create a more complex idle game with different mechanics, upgrades, and animations.