HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>size — input width</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}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input{font:inherit;padding:.5rem .75rem;border:1px solid #cbd5e1;border-radius:6px}.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>size on &lt;input&gt;</h1>

  <label for=username>Username:</label>

  <input id=username name=username size=30>

  <p class=hint><code>size="30"</code> hints ~30 characters wide. Use <code>maxlength</code> separately to cap input length.</p>

</body>

</html>

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HTML size Attribute — input Character Width