HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>print() — events</title>
</head>
<body>
  <button type="button" id="printBtn">Print</button>
  <pre id="out">Click Print to see events…</pre>
  <script>
    window.addEventListener("beforeprint", function () {
      document.getElementById("out").textContent = "Print dialog opened.";
    });
    window.addEventListener("afterprint", function () {
      document.getElementById("out").textContent = "Print dialog closed.";
    });
    document.getElementById("printBtn").onclick = function () {
      window.print();
    };
  </script>
</body>
</html>

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JavaScript print() — before/after events (Try It)