HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>dirname form submit</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}form{max-width:480px;padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}label{display:block;margin-bottom:.35rem;font-size:.875rem;font-weight:600;color:#475569}textarea{width:100%;box-sizing:border-box;font:inherit;padding:.55rem .65rem;border:1px solid #cbd5e1;border-radius:6px;min-height:5rem}button{margin-top:.75rem;font:inherit;padding:.45rem .85rem;border:1px solid #2563eb;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}pre{margin:1rem 0 0;padding:.75rem;background:#0f172a;color:#e2e8f0;border-radius:8px;font-size:.8125rem;max-width:480px;overflow-x:auto}p{font-size:.875rem;color:#64748b;max-width:520px;margin-top:1rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>dirname sends direction on submit</h1>

  <form id=commentForm action=# onsubmit=return!1>

    <label for=comment>Your comment</label>

    <textarea id=comment name=comment dir=auto dirname=comment-dir placeholder="Type English or Arabic…">Hello world</textarea>

    <button type=button id=previewBtn>Preview query string</button>

Click preview to see name/value pairs

dirname="comment-dir" adds a second field like comment-dir=ltr. Use dir to control direction; dirname names the extra submitted field.

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HTML dirname Attribute — Form Submission