HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>spellcheck — form fields</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:1rem 0 .35rem;font-size:.875rem;font-weight:500;color:#0f172a}input,textarea{width:100%;max-width:420px;font:inherit;padding:.5rem .65rem;border:1px solid #cbd5e1;border-radius:6px;box-sizing:border-box}textarea{min-height:5rem;resize:vertical}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>spellcheck on form fields</h1>

  <label for=bio>Bio (spellcheck on):</label>

  <textarea id=bio spellcheck=true>I enjoy writting code and learning HTML.</textarea>

  <label for=username>Username (spellcheck off):</label>

  <input id=username spellcheck=false value=mari_dev_2026>

  <p class=hint>Usernames and code-like values often use <code>spellcheck="false"</code> so the browser does not flag valid tokens as mistakes.</p>

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HTML spellcheck Attribute — textarea and input