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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>alert() — template</title>
</head>
<body>
  <button type="button" id="cartBtn">Add to cart</button>
  <script>
    var item = "Keyboard";
    var price = 49.99;
    document.getElementById("cartBtn").onclick = function () {
      alert("Added \"" + item + "\" to cart.\nPrice: $" + price.toFixed(2));
    };
  </script>
</body>
</html>

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JavaScript Window alert() — template literal (Try It)