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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clearInterval() — double</title>
</head>
<body>
  <h1>clearInterval() clear twice</h1>
  <pre id="out">Waiting...</pre>
  <script>
    (function () {
      var id = setInterval(function () {}, 1000);
      clearInterval(id);
      clearInterval(id);
      document.getElementById("out").textContent = "ok";
    })();
  </script>
</body>
</html>

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JavaScript clearInterval() — clear twice (Try It)