HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>classList snapshot</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent = JSON.stringify({
      supported: "classList" in Element.prototype,
      type: "DOMTokenList",
      tip: "Prefer classList over string edits on className",
      status: "Baseline Widely available (MDN)"
    }, null, 2);
  </script>
</body>
</html>

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Element.classList — snapshot (Try It)