HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Basic HTML Comment</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{margin-top:1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#1e40af;max-width:420px}</style>
</head>
<body>
  <h1>HTML Comments</h1>

  
  <p>Welcome! Please log in to continue.</p>

  <p class=note>Open View Source to see the comment above. It does not appear on the page.</p>
</body>
</html>

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HTML Comments — Basic Single-Line Syntax