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// Clicking in the box toggles fullscreen on and off.function setup() { createCanvas(windowWidth, windowHeight); background(0);}function mousePressed() { if (mouseX > 0 && mouseX < windowWidth && mouseY > 0 && mouseY < windowHeight) { let fs = fullscreen(); fullscreen(!fs); }}function draw() { fill(255); circle(width/2, height/2, height/2);}function windowResized() { resizeCanvas(windowWidth, windowHeight);}