HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setTimeout() — toast</title>
</head>
<body>
  <button type="button" id="saveBtn">Save</button>
  <p id="toast" hidden>Saved successfully!</p>
  <script>
    document.getElementById("saveBtn").onclick = function () {
      var toast = document.getElementById("toast");
      toast.hidden = false;
      setTimeout(function () {
        toast.hidden = true;
      }, 3000);
    };
  </script>
</body>
</html>

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JavaScript setTimeout() — auto-hide toast (Try It)