HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>frameborder — borderless</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}iframe{display:block;max-width:100%}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>frameborder — borderless embed</h1>
  <iframe srcdoc="&lt;!DOCTYPE html&gt;&lt;body style='font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:linear-gradient(135deg,#e0f2fe,#f0fdf4);color:#334155;'&gt;Embedded widget content&lt;/body&gt;" frameborder=0 width=100% height=200 title="Embedded widget" style=border:none></iframe>
  <p class=hint><code>frameborder="0"</code> removes the default border. Modern equivalent: <code>iframe { border: none; }</code>.</p>
</body>
</html>

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HTML frameborder Attribute — Borderless iframe