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function gameLoop() {
const gp = navigator.getGamepads()[0];
if (gp.buttons[0].value > 0 || gp.buttons[0].pressed) {
b--;
} else if (gp.buttons[1].value > 0 || gp.buttons[1].pressed) {
a++;
} else if (gp.buttons[2].value > 0 || gp.buttons[2].pressed) {
b++;
} else if (gp.buttons[3].value > 0 || gp.buttons[3].pressed) {
a--;
}
ball.style.left = `${a * 2}px`; // ball is a UI widget
ball.style.top = `${b * 2}px`;
requestAnimationFrame(gameLoop);
}
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