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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .toggleClass array</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    #box {

      width: 200px; padding: 20px; border: 2px solid #333;

      cursor: pointer; text-align: center;

    }

    .bold { font-weight: bold; }

    .italic { font-style: italic; }

    .hint { margin-top: 10px; color: #64748b; font-size: 14px; }

  </style>

</head>

<body>

  <div id="box">Click to toggle bold + italic</div>

  <p class="hint">Uses toggleClass(["bold", "italic"]).</p>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#box").on("click", function() {

      $(this).toggleClass(["bold", "italic"]);

    });

  </script>

</body>

</html>

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jQuery .toggleClass(['a','b']) — array syntax (Try It)