HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Modern HTML5 document</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}pre{background:#1e293b;color:#e2e8f0;padding:.75rem 1rem;border-radius:8px;font-size:.8125rem;overflow-x:auto}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}</style>

</head>

<body>

  <h1>Use DOCTYPE for HTML5</h1>



  <pre>&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
  ...
&lt;/html&gt;</pre>



  <p>No <code>version</code> attribute needed. The doctype triggers standards mode in browsers.</p>



  <p class=hint>This is what you should write in all new projects instead of <code>version="4.01"</code>.</p>

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HTML version Attribute — modern DOCTYPE