Sure! Here's an example of a simplified version of Flappy Bird implemented as a single HTML file using JavaScript:
This HTML file creates a canvas element where the game is rendered. The bird is represented by a red square, and the pipes are green rectangles. By tapping or clicking the canvas, the bird flaps its wings to avoid colliding with the pipes. The score increases whenever the bird passes through a pair of pipes. The game ends if the bird hits a pipe or touches the ground.
Please note that this implementation is a simplified version of Flappy Bird and may not have all the features and complexity of the original game.