HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>matches class</title>
  <style>.card { padding: 12px; border: 1px solid #333; display: inline-block; }</style>
</head>
<body>
  <div class="card" id="card">Card</div>
  <button type="button" id="btn">Toggle active</button>
  <pre id="out">—</pre>
  <script>
    var card = document.getElementById("card");
    document.getElementById("btn").onclick = function () {
      card.classList.toggle("active");
      document.getElementById("out").textContent = "matches('.active'): " + card.matches(".active");
    };
  </script>
</body>
</html>

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Element.matches — class selector (Try It)