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<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .prevUntil('dt')</title>

</head>

<body>

  <dl>

    <dt id="term-1">term 1</dt>

    <dd>definition 1-a</dd>

    <dd>definition 1-b</dd>

    <dd>definition 1-c</dd>

    <dd>definition 1-d</dd>

    <dt id="term-2">term 2</dt>

    <dd>definition 2-a</dd>

    <dd>definition 2-b</dd>

    <dd>definition 2-c</dd>

    <dt id="term-3">term 3</dt>

    <dd>definition 3-a</dd>

    <dd>definition 3-b</dd>

  </dl>

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

  <script>

    $("#term-2").prevUntil("dt").css("background-color", "red");

  </script>

</body>

</html>

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jQuery .prevUntil('dt') — definition list (Try It)