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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>HTML isindex 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 .75rem;font-size:1.25rem;color:#0f172a}.note{background:#fffbeb;border:1px solid #fde68a;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#92400e;max-width:420px}</style>

</head>

<body>

  <h1>Legacy isindex Example</h1>

  

  <isindex prompt="Search this site:">

  <p><strong>Note:</strong> The &lt;isindex&gt; HTML element is obsolete and is no longer supported in modern web browsers.</p>

  <p class=note><strong>Deprecated:</strong> Use &lt;form&gt; with &lt;input type="search"&gt; instead.</p>

</body>

</html>

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HTML isindex Tag — Legacy prompt Attribute