| 
 | 1 | +const game = { timer: 0, start: null };  | 
 | 2 | + | 
 | 3 | +// Create Message Element  | 
 | 4 | +const message = document.createElement("div");  | 
 | 5 | +message.classList.add("message");  | 
 | 6 | +message.textContent = "Press To Start";  | 
 | 7 | +document.body.prepend(message);  | 
 | 8 | + | 
 | 9 | +// Create a Box  | 
 | 10 | +const box = document.createElement("div");  | 
 | 11 | +box.classList.add("box");  | 
 | 12 | + | 
 | 13 | +const output = document.querySelector(".output");  | 
 | 14 | +output.append(box);  | 
 | 15 | + | 
 | 16 | +box.addEventListener("click", () => {  | 
 | 17 | +  box.textContent = "";  | 
 | 18 | +  box.style.display = "none";  | 
 | 19 | +  game.timer = setTimeout(addBox, randomNumbers(3000));  | 
 | 20 | +  if (!game.start) {  | 
 | 21 | +    message.textContent = "Watch for element and click it";  | 
 | 22 | +  } else {  | 
 | 23 | +    const current = new Date().getTime();  | 
 | 24 | +    const duration = (current - game.start) / 1000;  | 
 | 25 | +    message.textContent = `It took ${duration} seconds to click`;  | 
 | 26 | +  }  | 
 | 27 | +});  | 
 | 28 | + | 
 | 29 | +function randomNumbers(max) {  | 
 | 30 | +  return Math.floor(Math.random() * max);  | 
 | 31 | +}  | 
 | 32 | + | 
 | 33 | +function addBox() {  | 
 | 34 | +  game.start = new Date().getTime();  | 
 | 35 | +  const container = output.getBoundingClientRect();  | 
 | 36 | +  const dim = [randomNumbers(50) + 20, randomNumbers(50) + 20];  | 
 | 37 | +  box.style.display = "block";  | 
 | 38 | +  box.style.width = `${dim[0]}px`;  | 
 | 39 | +  box.style.height = `${dim[1]}px`;  | 
 | 40 | +  box.style.backgroundColor = "#" + Math.random().toString(16).substr(-6);  | 
 | 41 | +  box.style.left = randomNumbers(container.width - dim[0]) + "px";  | 
 | 42 | +  box.style.top = randomNumbers(container.height - dim[1]) + "px";  | 
 | 43 | +  box.style.borderRadius = randomNumbers(50) + "%";  | 
 | 44 | +}  | 
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