HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>dirName in JavaScript</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}input{width:100%;box-sizing:border-box;font:inherit;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px}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>Set dirname with JavaScript</h1>

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

    <label for=dynamicText>Message</label>

    <input id=dynamicText name=message dir=auto value=مرحبًا>

  </form>

  <p id=info>dirname field name: …</p>

  <script>var input=document.getElementById("dynamicText");input.dirName="message-dir",document.getElementById("info").textContent="dirname field name: "+input.dirName+" (submits message-dir=ltr or rtl)"</script>

</body>

</html>

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HTML dirname Attribute — Set with JavaScript