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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .toggleClass highlight</title>

  <style>

    p { margin: 4px; font-size: 16px; font-weight: bolder; cursor: pointer; }

    .blue { color: blue; }

    .highlight { background: yellow; }

    .hint { margin-top: 12px; color: #64748b; font-size: 14px; }

  </style>

</head>

<body>

  <p class="blue">Click to toggle highlight on these paragraphs.</p>

  <p class="blue">Second paragraph — click me too.</p>

  <p class="hint">Each click adds or removes the highlight class.</p>

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

  <script>

    $("p").not(".hint").on("click", function() {

      $(this).toggleClass("highlight");

    });

  </script>

</body>

</html>

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jQuery .toggleClass('highlight') — click to toggle (Try It)