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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>Legacy nextid Example</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}.note{margin:0 0 1rem;padding:.75rem 1rem;background:#fef3c7;border:1px solid #fcd34d;border-radius:8px;font-size:.875rem;color:#92400e}</style>
</head>
<body>
  <h1>Legacy nextid</h1>
  <p class=note>The nextid tag is deprecated and not supported in modern browsers.</p>
  <nextid>unique_identifier</nextid>
  <p>Content that would receive the next auto-generated ID.</p>
</body>
</html>

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HTML nextid Tag — Legacy Markup