Sure, here's an example of a simple text-based game implemented as a single HTML file using JavaScript:
To play the game:
1. Save the code provided above as an HTML file, e.g., "escape.html".
2. Open the "escape.html" file in a web browser (preferably on a smartphone).
3. The game will prompt you to enter your name. Enter your name and click "OK."
4. Follow the instructions presented in each alert or confirm dialog to progress through the game.
5. Try to make the right choices to escape the burning building.
This is a very basic example, but it illustrates how a simple text-based game can be implemented using HTML and JavaScript within a single HTML file.