I'm sorry for the confusion, but there is a small issue here. Pygame is a set of Python modules designed for writing video games, and it's not intended for creating HTML5 games. HTML5 games are typically written in JavaScript, not Python.

However, I can certainly provide a simplified Pygame example where a red ball moves across the screen. Remember, this will only work in a Python environment -- not directly within a web browser:

import pygame
import sys

pygame.init()

# Screen dimensions
width, height = 800, 600
screen = pygame.display.set_mode((width, height))

# Ball attributes
radius = 15
pos = [width // 2, height // 2]
vel = [1, 1]
color = (255, 0, 0)  # Red

# Game loop
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    # Update ball position
    pos[0] += vel[0]
    pos[1] += vel[1]

    # Reflect ball off walls
    if pos[0] - radius < 0 or pos[0] + radius > width:
        vel[0] *= -1
    if pos[1] - radius < 0 or pos[1] + radius > height:
        vel[1] *= -1

    # Draw scene
    screen.fill((0, 0, 0))  # Clear screen (black)
    pygame.draw.circle(screen, color, pos, radius)  # Draw ball
    pygame.display.flip()  # Update display

This script will create a Pygame window where a red ball will move and bounce off the window edges.

If you are really interested in developing HTML5 games, then learning JavaScript and libraries such as Phaser would be more applicable.

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