HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>resize width</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    .width-tag { display: inline-block; background: #2563eb; color: #fff; padding: 4px 10px; border-radius: 999px; font-weight: 600; margin: 4px 4px 0 0; font-size: 13px; }
    #hint { color: #64748b; font-size: 14px; margin-top: 12px; }
  </style>
</head>
<body>
  <div id="tags"></div>
  <p id="hint">Resize the window — width tags appear at the top (newest first).</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(window).on("resize", function() {
      $("body").prepend('<span class="width-tag">' + $(window).width() + "px</span>");
    });
    $("body").prepend('<span class="width-tag">' + $(window).width() + "px (initial)</span>");
  </script>
</body>
</html>

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jQuery resize event — show window width (Try It)