HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .prevAll() — divs</title>

  <style>

    div {

      width: 70px;

      height: 70px;

      background: #abc;

      border: 2px solid black;

      margin: 10px;

      float: left;

    }

    div.before { border-color: red; }

  </style>

</head>

<body>

  <div>1</div>

  <div>2</div>

  <div>3</div>

  <div>4</div>

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

  <script>

    $("div").last().prevAll().addClass("before");

  </script>

</body>

</html>

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jQuery .prevAll() — div siblings (Try It)