HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Editor — Draft</title>
  <style>body{font-family:system-ui,sans-serif;margin:1.5rem}</style>
</head>
<body>
  <button id="save" type="button">Save</button>
  <pre id="out">Click Save to flash the tab title.</pre>
  <script>
    var out = document.getElementById("out");
    document.getElementById("save").addEventListener("click", function () {
      var original = document.title;
      document.title = "Saved!";
      out.textContent = "Flashed: " + document.title;
      setTimeout(function () {
        document.title = original;
        out.textContent = "Restored: " + document.title;
      }, 2000);
    });
  </script>
</body>
</html>

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Document.title — flash and restore (Try It)