HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>.pushStack vs find</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 440px; }
    #box { padding: 12px; background: #f1f5f9; border-radius: 8px; }
    span { display: inline-block; margin: 4px; padding: 6px 10px; background: #fff; border-radius: 4px; }
    span.x { outline: 2px solid #2563eb; }
    span.y { background: #fde68a; }
    button { margin: 8px 6px 0 0; padding: 8px 12px; }
  </style>
</head>
<body>
  <div id="box">
    <span>One</span>
    <span>Two</span>
  </div>
  <button type="button" id="find">.find + .end</button>
  <button type="button" id="push">pushStack + .end</button>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $( "#find" ).on( "click", function () {
      $( "#box span" ).removeClass( "x y" );
      $( "#box" ).find( "span" ).addClass( "x" ).end().css( "outline", "2px dashed #94a3b8" );
    });
    $( "#push" ).on( "click", function () {
      $( "#box span" ).removeClass( "x y" );
      var nodes = document.querySelectorAll( "#box > span" );
      $( "#box" ).pushStack( Array.from( nodes ) ).addClass( "y" ).end().css( "outline", "2px solid #22c55e" );
    });
  </script>
</body>
</html>

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jQuery .pushStack() vs .find() (Try It)