HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery :not() vs .not() demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    button { margin: 4px; padding: 8px 14px; }
    .via-not { outline: 2px solid #2563eb; }
    .via-method { outline: 2px solid #ea580c; }
    #log { margin-top: 12px; font-family: monospace; white-space: pre-line; }
  </style>
</head>
<body>
  <div id="toolbar">
    <button class="primary">Save</button>
    <button class="ghost">Cancel</button>
    <button class="danger">Delete</button>
    <button class="ghost">Help</button>
  </div>
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    // CSS :not() — one selector string
    $("#toolbar button:not(.ghost)").addClass("via-not");

    // .not() — often clearer when you already hold a collection
    $("#toolbar button").not(".ghost, .danger").addClass("via-method");

    var notCount = $("#toolbar button:not(.ghost)").length;
    var methodCount = $("#toolbar button").not(".ghost, .danger").length;
    $("#log").text(
      ":not(.ghost) matched " + notCount + " button(s)\n" +
      ".not('.ghost, .danger') matched " + methodCount + " button(s)"
    );
  </script>
</body>
</html>

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jQuery :not() vs .not() — readable filtering (Try It)