Listening to browser events is straightforward:
window.addEventListener('keydown', (e) => if (e.key === 'ArrowLeft') player.velocity.x = -5; ); window.addEventListener('keyup', (e) => if (e.key === 'ArrowLeft') player.velocity.x = 0; ); For mobile, you can listen to touchstart , touchmove , and touchend events. A common pattern is to maintain an object like keys = ArrowLeft: false and update it on events, then read that state during the update() phase. create game with javascript
For 3D, WebGL (via the webgl context) is available, though most 2D games and beginners will stick to the simpler 2D context. Listening to browser events is straightforward: window