HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clearTimeout() — cancel button</title>
</head>
<body>
  <p id="notice">Waiting 3 seconds…</p>
  <button type="button" id="cancelBtn">Cancel</button>
  <script>
    var notice = document.getElementById("notice");
    var id = setTimeout(function () {
      notice.textContent = "Time is up!";
    }, 3000);
    document.getElementById("cancelBtn").onclick = function () {
      clearTimeout(id);
      notice.textContent = "Cancelled — message will not show.";
    };
  </script>
</body>
</html>

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JavaScript clearTimeout() — cancel button (Try It)