How to Build a Ping Pong Game in HTML

A retro-style ping pong game, built with nothing but HTML, CSS, and JavaScript. No game engine, no framework — just Canvas API and browser builtins. It features a 10-stage CPU mode, online P2P battles via WebRTC, and runs on both desktop and mobile. Demo: https://mame-max.itch.io/ping-pong-arcade Project Structure index.html — page wrapper index-sub.html — arcade monitor overlay game-disp.html — all game logic and Canvas rendering css/my-style.css — layout CSS The files load in layers via fetch() and innerHTML injection. All game code lives in game-disp.html . HTML Skeleton <div id= "game-wrap" > <div id= "game-root" > <canvas id= "c" width= "499" height= "600" ></canvas> <div id= "scoreboard" > ... </div> <div id= "overlay" > ... </div> <!-- title / result screens --> </div> <!-- mobile d-pad --> <div id= "dpad" > <button class= "dpad-btn" id= "btn-up" > ▲ </button> <button class= "dpad-btn" id= "btn-down" > ▼ </button> </div> </div> canvas#c is the game surface. #overlay hosts the ti