HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Legacy plugin andSelf</title>
  <style>.section-active { outline: 2px solid green; padding: 4px; }</style>
</head>
<body>
  <section class="widget">
    <div class="content">Widget body</div>
  </section>
  <script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
  <script>
    $.fn.highlightSection = function () {
      return this.find(".content")
        .andSelf()
        .addClass("section-active");
    };
    $(".widget").highlightSection();
  </script>
</body>
</html>

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jQuery .andSelf() — legacy plugin pattern (Try It)