As an AI text-based program, I can provide you with a basic implementation of Flappy Bird in a single HTML file. However, please note that due to the limitations of text-based interaction, I won't be able to provide pictograms or full game interactivity. Here's a simplified code that you can run in your browser:
You can copy the code above and save it as a single HTML file. When you run the file in your browser, you should see a simplified version of Flappy Bird game. To control the bird, use the spacebar to make it flap and try to navigate between the green obstacles. The score will be displayed at the top left corner, and when the game is over, an alert will show your final score.
Note: This implementation is quite basic and doesn't include all the features of a full Flappy Bird game. It's just meant to provide a starting point for learning and experimentation.