HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>standby — JS loading pattern</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}#loadingMessage{display:none;padding:.65rem .9rem;background:#fef3c7;border:1px solid #fcd34d;border-radius:6px;color:#92400e;font-size:.875rem;margin-bottom:.75rem;max-width:320px}object{width:280px;height:120px;border:1px solid #cbd5e1;border-radius:6px;display:block;background:#fff}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>JavaScript loading message</h1>

  <div id=loadingMessage role=status aria-live=polite>Loading content, please wait...</div>

  <object id=dynamicObject data="" type=image/svg+xml>

    <p>Your browser does not support embedded objects.</p>

  </object>

  <script>document.addEventListener("DOMContentLoaded",(function(){var t=document.getElementById("loadingMessage"),e=document.getElementById("dynamicObject");t.style.display="block",e.data="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='280' height='120'%3E%3Crect fill='%23bbf7d0' width='280' height='120'/%3E%3Ctext x='140' y='68' text-anchor='middle' fill='%23166534' font-family='system-ui' font-size='14'%3ELoaded!%3C/text%3E%3C/svg%3E",e.addEventListener("load",(function(){t.style.display="none"}))}))</script>

</body>

</html>

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HTML standby Attribute — Modern JavaScript Loading UI