HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>removeAttribute class</title>
  <style>
    .highlight { background: #fef08a; padding: 8px; }
    .active { border: 2px solid #2563eb; }
  </style>
</head>
<body>
  <div id="card" class="highlight active">Card</div>
  <button type="button" id="btn">Remove class attribute</button>
  <pre id="out">—</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var card = document.getElementById("card");
      card.removeAttribute("class");
      document.getElementById("out").textContent =
        "getAttribute class: " + card.getAttribute("class");
    });
  </script>
</body>
</html>

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Element.removeAttribute — remove class (Try It)