HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>confirm() — navigate</title>
</head>
<body>
  <p>You have unsaved changes on this demo page.</p>
  <button type="button" id="leaveBtn">Leave page</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("leaveBtn").onclick = function () {
      if (confirm("You have unsaved changes. Leave this page?")) {
        document.getElementById("out").textContent = "Navigating away… (demo stops here).";
      } else {
        document.getElementById("out").textContent = "Navigation canceled by the user.";
      }
    };
  </script>
</body>
</html>

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JavaScript Window confirm() — leave page (Try It)