HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Deprecated shadow Tag</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 .75rem;font-size:1.25rem;color:#0f172a}.warning{padding:.75rem 1rem;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;color:#991b1b;font-size:.875rem;max-width:420px;margin-bottom:1rem}my-element{display:block;padding:.75rem 1rem;border:1px dashed #cbd5e1;border-radius:8px;background:#fff;max-width:420px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Deprecated &lt;shadow&gt; syntax</h1>

  <p class=warning>The &lt;shadow&gt; tag is deprecated. Modern browsers ignore it. Use attachShadow() instead.</p>

  <my-element>

    <shadow>

      <style>p{color:red}</style>

      <p>This is shadow DOM content.</p>

    </shadow>

  </my-element>

  <p class=hint>This shows historical markup only. The content above will not be encapsulated in modern browsers.</p>

</body>

</html>

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HTML shadow Tag — Historical Syntax (Deprecated)