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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Modern ID Management</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}section{margin:0 0 1rem;padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}#dynamic-box{margin-top:1rem;padding:.75rem 1rem;background:#eff6ff;border:1px solid #93c5fd;border-radius:8px;color:#1e3a8a}</style>
</head>
<body>
  <h1>Modern Unique IDs</h1>
  <section id=user-profile>
    Static ID: <code>id="user-profile"</code>
  </section>
  <div id=dynamic-box>Dynamic ID assigned by JavaScript below.</div>
  <script>const box=document.getElementById("dynamic-box");box.id="item-"+Date.now(),box.textContent="Dynamic ID: "+box.id</script>
</body>
</html>

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HTML nextid Tag — Modern id Alternative